bug 352016: [Sync View] Team synchronization filteringv20111118-1221

16 files changed, 725 insertions, 125 deletions

diff --git a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/AbstractContentComparator.java b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/AbstractContentComparator.java
new file mode 100644
index 000000000..9a0cf1fe2
--- /dev/null
+++ b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/AbstractContentComparator.java
@@ -0,0 +1,106 @@
+/*******************************************************************************

+ * Copyright (c) 2011 IBM Corporation and others.

+ * All rights reserved. This program and the accompanying materials

+ * are made available under the terms of the Eclipse Public License v1.0

+ * which accompanies this distribution, and is available at

+ * http://www.eclipse.org/legal/epl-v10.html

+ *

+ * Contributors:

+ * IBM Corporation - initial API and implementation

+ *******************************************************************************/

+package org.eclipse.team.internal.core.subscribers;

+

+import java.io.*;

+

+import org.eclipse.core.resources.IFile;

+import org.eclipse.core.resources.IResource;

+import org.eclipse.core.runtime.CoreException;

+import org.eclipse.core.runtime.IProgressMonitor;

+import org.eclipse.team.core.TeamException;

+import org.eclipse.team.core.history.IFileRevision;

+import org.eclipse.team.core.variants.IResourceVariant;

+import org.eclipse.team.internal.core.Policy;

+import org.eclipse.team.internal.core.TeamPlugin;

+

+/**

+ * Compare local and remote contents.

+ *

+ * This comparator makes use of the <code>IStorage</code> provided by

+ * an <code>IResourceVariant</code> or an <code>IFileRevision</code>to obtain the remote contents.

+ * This means that the comparison may contact the server unless the contents

+ * were cached locally by a previous operation. The caching of remote

+ * contents is subscriber specific.

+ */

+public abstract class AbstractContentComparator {

+	private boolean ignoreWhitespace = false;

+

+	public AbstractContentComparator(boolean ignoreWhitespace) {

+		this.ignoreWhitespace = ignoreWhitespace;

+	}

+

+	public boolean compare(IResource e1, IResourceVariant e2, IProgressMonitor monitor) {

+		return compareObjects(e1, e2, monitor);

+	}

+

+	public boolean compare(IResource e1, IFileRevision e2, IProgressMonitor monitor) {

+		return compareObjects(e1, e2, monitor);

+	}

+

+	private boolean compareObjects(Object e1, Object e2, IProgressMonitor monitor) {

+		InputStream is1 = null;

+		InputStream is2 = null;

+		try {

+			monitor.beginTask(null, 100);

+			is1 = getContents(e1, Policy.subMonitorFor(monitor, 30));

+			is2 = getContents(e2, Policy.subMonitorFor(monitor, 30));

+			return contentsEqual(Policy.subMonitorFor(monitor, 40), is1, is2, shouldIgnoreWhitespace());

+		} catch (TeamException e) {

+			TeamPlugin.log(e);

+			return false;

+		} finally {

+			try {

+				try {

+					if (is1 != null) {

+						is1.close();

+					}

+				} finally {

+					if (is2 != null) {

+						is2.close();

+					}

+				}

+			} catch (IOException e) {

+				// Ignore

+			}

+			monitor.done();

+		}

+	}

+

+	protected boolean shouldIgnoreWhitespace() {

+		return ignoreWhitespace;

+	}

+

+	abstract protected boolean contentsEqual(IProgressMonitor monitor, InputStream is1, InputStream is2,

+			boolean ignoreWhitespace);

+

+	private InputStream getContents(Object resource, IProgressMonitor monitor)

+			throws TeamException {

+		try {

+			if (resource instanceof IFile) {

+				return new BufferedInputStream(((IFile) resource).getContents());

+			} else if (resource instanceof IResourceVariant) {

+				IResourceVariant remote = (IResourceVariant) resource;

+				if (!remote.isContainer()) {

+					return new BufferedInputStream(remote.getStorage(monitor)

+							.getContents());

+				}

+			} else if (resource instanceof IFileRevision) {

+				IFileRevision remote = (IFileRevision) resource;

+				return new BufferedInputStream(remote.getStorage(monitor)

+						.getContents());

+			}

+			return null;

+		} catch (CoreException e) {

+			throw TeamException.asTeamException(e);

+		}

+	}

+}
\ No newline at end of file
diff --git a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ContentComparator.java b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ContentComparator.java
index 210f25bd7..9e2e05bca 100644
--- a/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ContentComparator.java
+++ b/bundles/org.eclipse.team.core/src/org/eclipse/team/internal/core/subscribers/ContentComparator.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -10,81 +10,43 @@
  *******************************************************************************/
 package org.eclipse.team.internal.core.subscribers;
 
-import java.io.*;
+import java.io.IOException;
+import java.io.InputStream;
 
-import org.eclipse.core.resources.IFile;
-import org.eclipse.core.runtime.*;
-import org.eclipse.team.core.TeamException;
-import org.eclipse.team.core.history.IFileRevision;
-import org.eclipse.team.core.variants.IResourceVariant;
-import org.eclipse.team.internal.core.Policy;
-import org.eclipse.team.internal.core.TeamPlugin;
+import org.eclipse.core.runtime.IProgressMonitor;
 
 /**
- * This is an internal class that is used by the <code>ContentComparisonSyncInfoFilter</code>
- * to compare the contents of the local and remote resources
+ * This is an internal class that is used by the
+ * {@link org.eclipse.team.core.synchronize.SyncInfoFilter.ContentComparisonSyncInfoFilter}
+ * and {@link ContentComparisonDiffFilter} to compare the contents of the local
+ * and remote resources.
  */
-public class ContentComparator {
-
-	private boolean ignoreWhitespace = false;
+public class ContentComparator extends AbstractContentComparator{
 
 	public ContentComparator(boolean ignoreWhitespace) {
-		this.ignoreWhitespace = ignoreWhitespace;
-	}
-		
-	public boolean compare(Object e1, Object e2, IProgressMonitor monitor) {
-		InputStream is1 = null;
-		InputStream is2 = null;
-		try {
-			monitor.beginTask(null, 100);
-			is1 = getContents(e1, Policy.subMonitorFor(monitor, 50));
-			is2 = getContents(e2, Policy.subMonitorFor(monitor, 50));
-			return contentsEqual(is1, is2, shouldIgnoreWhitespace());
-		} catch(TeamException e) {
-			TeamPlugin.log(e);
-			return false;
-		} finally {
-			try {
-				try {
-					if (is1 != null) {
-						is1.close();
-					}
-				} finally {
-					if (is2 != null) {
-						is2.close();
-					}
-				}
-			} catch (IOException e) {
-				// Ignore
-			}
-			monitor.done();
-		}
-	}
-
-	protected boolean shouldIgnoreWhitespace() {
-		return ignoreWhitespace;
+		super(ignoreWhitespace);
 	}
 
 	/**
 	 * Returns <code>true</code> if both input streams byte contents is
 	 * identical.
 	 * 
-	 * @param input1
+	 * @param is1
 	 *                   first input to contents compare
-	 * @param input2
+	 * @param is2
 	 *                   second input to contents compare
 	 * @return <code>true</code> if content is equal
 	 */
-	private boolean contentsEqual(InputStream is1, InputStream is2, boolean ignoreWhitespace) {
+	protected boolean contentsEqual(IProgressMonitor monitor, InputStream is1,
+			InputStream is2, boolean ignoreWhitespace) {
 		try {
 			if (is1 == is2)
 				return true;
-
-			if (is1 == null && is2 == null) // no byte contents
+			// no byte contents
+			if (is1 == null && is2 == null)
 				return true;
-
-			if (is1 == null || is2 == null) // only one has
-														 // contents
+			// only one has contents
+			if (is1 == null || is2 == null)
 				return false;
 
 			while (true) {
@@ -98,7 +60,6 @@ public class ContentComparator {
 					return true;
 				if (c1 != c2)
 					break;
-
 			}
 		} catch (IOException ex) {
 		} finally {
@@ -124,23 +85,4 @@ public class ContentComparator {
 			return false;
 		return Character.isWhitespace((char) c);
 	}
-
-	private InputStream getContents(Object resource, IProgressMonitor monitor) throws TeamException {
-		try {
-			if (resource instanceof IFile) {
-				return new BufferedInputStream(((IFile) resource).getContents());
-			} else if(resource instanceof IResourceVariant) {
-				IResourceVariant remote = (IResourceVariant)resource;
-				if (!remote.isContainer()) {
-					return new BufferedInputStream(remote.getStorage(monitor).getContents());
-				}
-			} else if(resource instanceof IFileRevision) {
-				IFileRevision remote = (IFileRevision)resource;
-				return new BufferedInputStream(remote.getStorage(monitor).getContents());
-			}
-			return null;
-		} catch (CoreException e) {
-			throw TeamException.asTeamException(e);
-		}
-	}
 }
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIMessages.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIMessages.java
index a49af0f10..78ce9d49b 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIMessages.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIMessages.java
@@ -48,7 +48,6 @@ public class CVSUIMessages extends NLS {
 	public static String CommitWizard_13;
 	public static String CommitWizard_8;
 	public static String CommitWizard_9;
-	public static String ComparePreferencePage_8;
 	public static String CreatePatchAction_0;
 	public static String CreatePatchAction_1;
 	public static String CVSHistoryPage_CollapseAllAction;
@@ -1011,7 +1010,10 @@ public class CVSUIMessages extends NLS {
 	public static String ComparePreferencePage_2;
 	public static String ComparePreferencePage_3;
 	public static String ComparePreferencePage_4;
+	public static String ComparePreferencePage_5;
 	public static String ComparePreferencePage_6;
+	public static String ComparePreferencePage_7;
+	public static String ComparePreferencePage_8;
 
 	public static String FileModificationValidator_3;
 	public static String FileModificationValidator_4;
@@ -1152,7 +1154,6 @@ public class CVSUIMessages extends NLS {
 	public static String CVSHistoryFilterDialog_showLocalRevisions;
 	public static String CVSHistoryTableProvider_base;
 	public static String CVSHistoryTableProvider_currentVersion;
-	public static String ComparePreferencePage_7;
 	public static String WorkspaceTraversalAction_0;
 	public static String OutgoingChangesDialog_0;
 	public static String OutgoingChangesDialog_1;
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIPlugin.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIPlugin.java
index 6d1896b0d..0112f1453 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIPlugin.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/CVSUIPlugin.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2009 IBM Corporation and others.
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -21,6 +21,7 @@ import java.util.*;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IResourceStatus;
 import org.eclipse.core.runtime.*;
+import org.eclipse.core.runtime.preferences.InstanceScope;
 import org.eclipse.jface.dialogs.*;
 import org.eclipse.jface.operation.IRunnableWithProgress;
 import org.eclipse.jface.preference.IPreferenceStore;
@@ -578,6 +579,7 @@ public class CVSUIPlugin extends AbstractUIPlugin {
 		store.setDefault(ICVSUIConstants.PREF_PRUNE_EMPTY_DIRECTORIES, CVSProviderPlugin.DEFAULT_PRUNE);
 		store.setDefault(ICVSUIConstants.PREF_TIMEOUT, CVSProviderPlugin.DEFAULT_TIMEOUT);
 		store.setDefault(ICVSUIConstants.PREF_CONSIDER_CONTENTS, true);
+		store.setDefault(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN, ""); //default pattern is empty string //$NON-NLS-1$		
 		store.setDefault(ICVSUIConstants.PREF_COMPRESSION_LEVEL, CVSProviderPlugin.DEFAULT_COMPRESSION_LEVEL);
 		store.setDefault(ICVSUIConstants.PREF_TEXT_KSUBST, CVSProviderPlugin.DEFAULT_TEXT_KSUBST_OPTION.toMode());
 		store.setDefault(ICVSUIConstants.PREF_USE_PLATFORM_LINEEND, true);
@@ -755,4 +757,8 @@ public class CVSUIPlugin extends AbstractUIPlugin {
 	public ActiveChangeSetManager getChangeSetManager() {
 		return CVSProviderPlugin.getPlugin().getChangeSetManager();
 	}
+
+	public org.osgi.service.prefs.Preferences getInstancePreferences() {
+		return InstanceScope.INSTANCE.getNode(getBundle().getSymbolicName());
+	}
 }
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ComparePreferencePage.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ComparePreferencePage.java
index fb199d292..7f67d0611 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ComparePreferencePage.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ComparePreferencePage.java
@@ -11,8 +11,11 @@
 package org.eclipse.team.internal.ccvs.ui;
 
 import org.eclipse.compare.CompareUI;
-import org.eclipse.jface.preference.BooleanFieldEditor;
-import org.eclipse.jface.preference.IPreferencePageContainer;
+import org.eclipse.jface.preference.*;
+import org.eclipse.jface.util.PropertyChangeEvent;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.layout.GridData;
+import org.eclipse.swt.widgets.Event;
 import org.eclipse.team.internal.ui.SWTUtils;
 import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;
 
@@ -20,6 +23,8 @@ import org.eclipse.ui.preferences.IWorkbenchPreferenceContainer;
  * Preference page for configuring CVS comparisons
  */
 public class ComparePreferencePage extends CVSFieldEditorPreferencePage {
+	private BooleanFieldEditor contents;
+	private StringFieldEditor regex;
 
     /* (non-Javadoc)
      * @see org.eclipse.team.internal.ccvs.ui.CVSFieldEditorPreferencePage#getPageHelpContextId()
@@ -39,22 +44,43 @@ public class ComparePreferencePage extends CVSFieldEditorPreferencePage {
      * @see org.eclipse.jface.preference.FieldEditorPreferencePage#createFieldEditors()
      */
     protected void createFieldEditors() {
-		addField(new BooleanFieldEditor(ICVSUIConstants.PREF_CONSIDER_CONTENTS,
+		IPreferenceStore store = getPreferenceStore();
+
+		contents = new BooleanFieldEditor(ICVSUIConstants.PREF_CONSIDER_CONTENTS,
 				CVSUIMessages.ComparePreferencePage_4,
 				BooleanFieldEditor.DEFAULT, getFieldEditorParent()) {
+			private Event selectionEvent = createSelectionEvent();
+			private Event createSelectionEvent() {
+				Event event = new Event();
+				event.type = SWT.Selection;
+				return event;
+			}
 			// invert the UI
 			protected void doLoad() {
 				super.doLoad();
 				getChangeControl(getFieldEditorParent()).setSelection(!getBooleanValue());
+				getChangeControl(getFieldEditorParent()).notifyListeners(SWT.Selection,
+						selectionEvent);
 			}
 			protected void doLoadDefault() {
 				super.doLoadDefault();
 				getChangeControl(getFieldEditorParent()).setSelection(!getBooleanValue());
+				getChangeControl(getFieldEditorParent()).notifyListeners(SWT.Selection,
+						selectionEvent);
 			}
 			protected void doStore() {
 				getPreferenceStore().setValue(getPreferenceName(), !getBooleanValue());
 			}
-		});
+		};
+		addField(contents);
+		regex = new StringFieldEditor(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN,
+				CVSUIMessages.ComparePreferencePage_5,
+				getFieldEditorParent());
+		addField(regex);
+		GridData data = new GridData();
+		data.horizontalIndent = 20;
+		regex.getLabelControl(getFieldEditorParent()).setLayoutData(data);
+		regex.setEnabled(store.getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS), getFieldEditorParent());
 		addField(new BooleanFieldEditor(
 				ICVSUIConstants.PREF_SHOW_COMPARE_REVISION_IN_DIALOG,
 				CVSUIMessages.ComparePreferencePage_3,
@@ -84,4 +110,8 @@ public class ComparePreferencePage extends CVSFieldEditorPreferencePage {
 		}
 	}
 
+	public void propertyChange(PropertyChangeEvent event) {
+		super.propertyChange(event);
+		regex.setEnabled(!contents.getBooleanValue(), getFieldEditorParent());
+	}
 }
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ICVSUIConstants.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ICVSUIConstants.java
index 35917d6a4..b5f1355ea 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ICVSUIConstants.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/ICVSUIConstants.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2007 IBM Corporation and others.
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -93,6 +93,10 @@ public interface ICVSUIConstants {
 	public final String PREF_CVS_RSH_PARAMETERS = "pref_cvs_rsh_parameters"; //$NON-NLS-1$
 	public final String PREF_CVS_SERVER = "pref_cvs_server"; //$NON-NLS-1$
 	public final String PREF_CONSIDER_CONTENTS = "pref_consider_contents"; //$NON-NLS-1$
+	/**
+	 * Preference to save the pattern for the regex filter used in the Synchronize View.
+	 */
+	public final String PREF_SYNCVIEW_REGEX_FILTER_PATTERN = "pref_syncview_regex_filter_pattern"; //$NON-NLS-1$
 	public final String PREF_REPLACE_UNMANAGED = "pref_replace_unmanaged"; //$NON-NLS-1$
 	public final String PREF_COMPRESSION_LEVEL = "pref_compression_level"; //$NON-NLS-1$
 	public final String PREF_TEXT_KSUBST = "pref_text_ksubst"; //$NON-NLS-1$
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/CompareSubscriberContext.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/CompareSubscriberContext.java
index f5a0631b4..fa871781d 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/CompareSubscriberContext.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/CompareSubscriberContext.java
@@ -10,9 +10,11 @@
  *******************************************************************************/
 package org.eclipse.team.internal.ccvs.ui.mappings;
 
-import org.eclipse.core.runtime.*;
-import org.eclipse.core.runtime.Preferences.IPropertyChangeListener;
-import org.eclipse.core.runtime.Preferences.PropertyChangeEvent;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.preferences.*;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
 import org.eclipse.team.core.diff.DiffFilter;
 import org.eclipse.team.core.diff.IDiff;
 import org.eclipse.team.core.mapping.ISynchronizationScopeManager;
@@ -23,8 +25,9 @@ import org.eclipse.team.internal.ccvs.ui.CVSUIPlugin;
 import org.eclipse.team.internal.ccvs.ui.ICVSUIConstants;
 import org.eclipse.team.internal.core.subscribers.ContentComparisonDiffFilter;
 import org.eclipse.team.internal.core.subscribers.SubscriberDiffTreeEventHandler;
+import org.eclipse.team.internal.ui.synchronize.RegexDiffFilter;
 
-public class CompareSubscriberContext extends CVSSubscriberMergeContext implements IPropertyChangeListener {
+public class CompareSubscriberContext extends CVSSubscriberMergeContext implements IPreferenceChangeListener {
 
 	public static SynchronizationContext createContext(ISynchronizationScopeManager manager, CVSCompareSubscriber subscriber) {
 		CompareSubscriberContext mergeContext = new CompareSubscriberContext(subscriber, manager);
@@ -34,7 +37,7 @@ public class CompareSubscriberContext extends CVSSubscriberMergeContext implemen
 	
 	protected CompareSubscriberContext(Subscriber subscriber, ISynchronizationScopeManager manager) {
 		super(subscriber, manager);
-		CVSUIPlugin.getPlugin().getPluginPreferences().addPropertyChangeListener(this);
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).addPreferenceChangeListener(this); //$NON-NLS-1$
 	}
 
 	/* (non-Javadoc)
@@ -42,7 +45,7 @@ public class CompareSubscriberContext extends CVSSubscriberMergeContext implemen
 	 */
 	public void dispose() {
 		super.dispose();
-		CVSUIPlugin.getPlugin().getPluginPreferences().removePropertyChangeListener(this);
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).removePreferenceChangeListener(this); //$NON-NLS-1$
 	}
 
 	/* (non-Javadoc)
@@ -57,20 +60,59 @@ public class CompareSubscriberContext extends CVSSubscriberMergeContext implemen
 	 * @see org.eclipse.team.core.subscribers.SubscriberMergeContext#getDiffFilter()
 	 */
 	protected DiffFilter getDiffFilter() {
-		if (CVSUIPlugin.getPlugin().getPluginPreferences().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS)) {
-			// Return a filter that selects any diffs whose contents are not equal
-			final DiffFilter contentsEqual = new ContentComparisonDiffFilter(false);
+		final DiffFilter contentFilter = createContentFilter();
+		final DiffFilter regexFilter = createRegexFilter();
+		if (contentFilter != null && regexFilter != null) {
+			return new DiffFilter() {
+				public boolean select(IDiff diff, IProgressMonitor monitor) {
+					return !contentFilter.select(diff, monitor)
+							&& !regexFilter.select(diff, monitor);
+				}
+			};
+		} else if (contentFilter != null) {
+			return new DiffFilter() {
+				public boolean select(IDiff diff, IProgressMonitor monitor) {
+					return !contentFilter.select(diff, monitor);
+				}
+			};
+		} else if (regexFilter != null) {
 			return new DiffFilter() {
 				public boolean select(IDiff diff, IProgressMonitor monitor) {
-					return !contentsEqual.select(diff, monitor);
+					return !regexFilter.select(diff, monitor);
 				}
 			};
 		}
 		return null;
 	}
 
-	public void propertyChange(PropertyChangeEvent event) {
-		if (event.getProperty().equals(ICVSUIConstants.PREF_CONSIDER_CONTENTS)) {
+	private boolean isConsiderContents() {
+		return CVSUIPlugin.getPlugin().getPreferenceStore().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS);
+	}
+
+	private DiffFilter createContentFilter() {
+		if (isConsiderContents()) {
+			// Return a filter that selects any diffs whose contents are not equal
+			return new ContentComparisonDiffFilter(false);
+		}
+		return null;
+	}
+
+	private DiffFilter createRegexFilter() {
+		if (isConsiderContents()) {
+			String pattern = CVSUIPlugin.getPlugin().getPreferenceStore().getString(
+					ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN);
+			if (pattern != null && !pattern.equals("")) { //$NON-NLS-1$
+				return new RegexDiffFilter(pattern);
+			}
+		}
+		return null;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener#preferenceChange(org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent)
+	 */
+	public void preferenceChange(PreferenceChangeEvent event) {
+		if (event.getKey().equals(ICVSUIConstants.PREF_CONSIDER_CONTENTS) || event.getKey().equals(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN)) {
 			SubscriberDiffTreeEventHandler handler = getHandler();
 			if (handler != null) {
 				handler.setFilter(getDiffFilter());
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/WorkspaceSubscriberContext.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/WorkspaceSubscriberContext.java
index e8f8e6350..3c83216fb 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/WorkspaceSubscriberContext.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/mappings/WorkspaceSubscriberContext.java
@@ -17,18 +17,19 @@ import java.util.List;
 import org.eclipse.core.resources.*;
 import org.eclipse.core.resources.mapping.*;
 import org.eclipse.core.runtime.*;
+import org.eclipse.core.runtime.preferences.*;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.team.core.RepositoryProvider;
-import org.eclipse.team.core.diff.IDiff;
-import org.eclipse.team.core.diff.IThreeWayDiff;
+import org.eclipse.team.core.diff.*;
 import org.eclipse.team.core.diff.provider.DiffTree;
 import org.eclipse.team.core.history.IFileRevision;
 import org.eclipse.team.core.mapping.*;
 import org.eclipse.team.core.mapping.provider.ResourceDiffTree;
 import org.eclipse.team.core.subscribers.Subscriber;
 import org.eclipse.team.core.subscribers.SubscriberScopeManager;
-import org.eclipse.team.core.synchronize.SyncInfo;
-import org.eclipse.team.core.synchronize.SyncInfoFilter;
+import org.eclipse.team.core.synchronize.*;
 import org.eclipse.team.core.synchronize.SyncInfoFilter.ContentComparisonSyncInfoFilter;
 import org.eclipse.team.core.variants.IResourceVariant;
 import org.eclipse.team.internal.ccvs.core.*;
@@ -38,11 +39,14 @@ import org.eclipse.team.internal.ccvs.core.resources.CVSWorkspaceRoot;
 import org.eclipse.team.internal.ccvs.core.resources.RemoteFile;
 import org.eclipse.team.internal.ccvs.ui.*;
 import org.eclipse.team.internal.ccvs.ui.Policy;
-import org.eclipse.team.internal.ccvs.ui.operations.*;
+import org.eclipse.team.internal.ccvs.ui.operations.CacheBaseContentsOperation;
+import org.eclipse.team.internal.ccvs.ui.operations.CacheRemoteContentsOperation;
 import org.eclipse.team.internal.core.mapping.GroupProgressMonitor;
+import org.eclipse.team.internal.core.subscribers.ContentComparisonDiffFilter;
 import org.eclipse.team.internal.core.subscribers.SubscriberDiffTreeEventHandler;
+import org.eclipse.team.internal.ui.synchronize.RegexDiffFilter;
 
-public class WorkspaceSubscriberContext extends CVSSubscriberMergeContext {
+public class WorkspaceSubscriberContext extends CVSSubscriberMergeContext implements IPreferenceChangeListener {
 
 	public static final class ChangeSetSubscriberScopeManager extends SubscriberScopeManager {
 		private final boolean consultSets;
@@ -79,10 +83,84 @@ public class WorkspaceSubscriberContext extends CVSSubscriberMergeContext {
 		mergeContext.initialize();
 		return mergeContext;
 	}
-	
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.core.subscribers.SubscriberMergeContext#getDiffFilter()
+	 */
+	protected DiffFilter getDiffFilter() {
+		final DiffFilter contentFilter = createContentFilter();
+		final DiffFilter regexFilter = createRegexFilter();
+		if (contentFilter != null && regexFilter != null) {
+			return new DiffFilter() {
+				public boolean select(IDiff diff, IProgressMonitor monitor) {
+					return !contentFilter.select(diff, monitor)
+							&& !regexFilter.select(diff, monitor);
+				}
+			};
+		} else if (contentFilter != null) {
+			return new DiffFilter() {
+				public boolean select(IDiff diff, IProgressMonitor monitor) {
+					return !contentFilter.select(diff, monitor);
+				}
+			};
+		} else if (regexFilter != null) {
+			return new DiffFilter() {
+				public boolean select(IDiff diff, IProgressMonitor monitor) {
+					return !regexFilter.select(diff, monitor);
+				}
+			};
+		}
+		return null;
+	}
+
 	protected WorkspaceSubscriberContext(CVSWorkspaceSubscriber subscriber, ISynchronizationScopeManager manager, int type) {
 		super(subscriber, manager);
 		this.type = type;
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).addPreferenceChangeListener(this); //$NON-NLS-1$
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.team.core.subscribers.SubscriberMergeContext#dispose()
+	 */
+	public void dispose() {
+		super.dispose();
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).removePreferenceChangeListener(this); //$NON-NLS-1$
+	}
+
+	private boolean isConsiderContents() {
+		return CVSUIPlugin.getPlugin().getPreferenceStore().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS);
+	}
+
+	private DiffFilter createContentFilter() {
+		if (isConsiderContents()) {
+			// Return a filter that selects any diffs whose contents are not equal
+			return new ContentComparisonDiffFilter(false);
+		}
+		return null;
+	}
+
+	private DiffFilter createRegexFilter() {
+		if (isConsiderContents()) {
+			String pattern = CVSUIPlugin.getPlugin().getPreferenceStore().getString(
+					ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN);
+			if (pattern != null && !pattern.equals("")) { //$NON-NLS-1$
+				return new RegexDiffFilter(pattern);
+			}
+		}
+		return null;
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener#preferenceChange(org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent)
+	 */
+	public void preferenceChange(PreferenceChangeEvent event) {
+		if (event.getKey().equals(ICVSUIConstants.PREF_CONSIDER_CONTENTS) || event.getKey().equals(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN)) {
+			SubscriberDiffTreeEventHandler handler = getHandler();
+			if (handler != null) {
+				handler.setFilter(getDiffFilter());
+				handler.reset();
+			}
+		}
 	}
 
 	public void markAsMerged(IDiff[] nodes, boolean inSyncHint, IProgressMonitor monitor) throws CoreException {
@@ -211,7 +289,7 @@ public class WorkspaceSubscriberContext extends CVSSubscriberMergeContext {
 		IFileRevision remote = getRemote(node);
 		if (variant != null && remote != null && remote instanceof IFileRevision) {
 			String ci1 = variant.getContentIdentifier();
-			String ci2 = ((IFileRevision)remote).getContentIdentifier();
+			String ci2 = remote.getContentIdentifier();
 			if (!ci1.equals(ci2)) {
 				throw new CVSException(NLS.bind(CVSUIMessages.WorkspaceSubscriberContext_0, resource.getFullPath().toString()));
 			}
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/messages.properties b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/messages.properties
index c2c0ef5d6..d7a161817 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/messages.properties
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/messages.properties
@@ -1028,6 +1028,7 @@ ComparePreferencePage_1=Show the &file author in compare editors
 ComparePreferencePage_2=Automatically enable chan&ge set grouping in CVS synchronizations
 ComparePreferencePage_3=Show revision &comparisons in a dialog
 ComparePreferencePage_4=Only look at time&stamps to detect changes
+ComparePreferencePage_5=Re&gular expression to ignore changes in synchronizations:
 ComparePreferencePage_6=See <a>''{0}''</a> for compare editor preferences.
 ComparePreferencePage_7=Allow &models (e.g. Java) to participate in synchronizations
 ComparePreferencePage_8=&Open a compare editor when comparing a single file
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/CompareParticipant.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/CompareParticipant.java
index 13f425e0d..e337f044b 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/CompareParticipant.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/CompareParticipant.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2006 IBM Corporation and others.
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -15,8 +15,9 @@ import java.util.Arrays;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
-import org.eclipse.core.runtime.Preferences.IPropertyChangeListener;
-import org.eclipse.core.runtime.Preferences.PropertyChangeEvent;
+import org.eclipse.core.runtime.preferences.*;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
 import org.eclipse.osgi.util.NLS;
 import org.eclipse.team.core.TeamException;
 import org.eclipse.team.core.subscribers.Subscriber;
@@ -31,7 +32,7 @@ import org.eclipse.team.internal.ui.Utils;
 import org.eclipse.team.ui.TeamUI;
 import org.eclipse.team.ui.synchronize.*;
 
-public class CompareParticipant extends CVSParticipant implements IPropertyChangeListener {
+public class CompareParticipant extends CVSParticipant implements IPreferenceChangeListener {
 	
 	public static final String CONTEXT_MENU_CONTRIBUTION_GROUP = "context_group_1"; //$NON-NLS-1$
 	public static final String NON_MODAL_CONTEXT_MENU_CONTRIBUTION_GROUP = "context_group_2"; //$NON-NLS-1$
@@ -70,18 +71,56 @@ public class CompareParticipant extends CVSParticipant implements IPropertyChang
 		}
 	};
 	
+	private SyncInfoFilter createSyncInfoFilter() {
+		final SyncInfoFilter regexFilter = createRegexFilter();
+		if (isConsiderContents() && regexFilter != null) {
+			return new SyncInfoFilter() {
+				public boolean select(SyncInfo info, IProgressMonitor monitor) {
+					return contentComparison.select(info, monitor)
+							&& !regexFilter.select(info, monitor);
+				}
+			};
+		} else if (isConsiderContents()) {
+			return new SyncInfoFilter() {
+				public boolean select(SyncInfo info, IProgressMonitor monitor) {
+					return contentComparison.select(info, monitor);
+				}
+			};
+		} else if (regexFilter != null) {
+			return new SyncInfoFilter() {
+				public boolean select(SyncInfo info, IProgressMonitor monitor) {
+					// want to select infos which contain at least one unmatched difference
+					return !regexFilter.select(info, monitor);
+				}
+			};
+		}
+		return null;
+	}
+
+	private boolean isConsiderContents() {
+		return CVSUIPlugin.getPlugin().getPreferenceStore().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS);
+	}
+
+	private SyncInfoFilter createRegexFilter() {
+		if (isConsiderContents()) {
+			String pattern = CVSUIPlugin.getPlugin().getPreferenceStore().getString(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN);
+			if (pattern != null && !pattern.equals("")) { //$NON-NLS-1$
+				return new RegexSyncInfoFilter(pattern);
+			}
+		}
+		return null;
+	}
+
 	public CompareParticipant(CVSCompareSubscriber subscriber) {
 	    setSubscriber(subscriber);
 	}
-		
+
 	/* (non-Javadoc)
 	 * @see org.eclipse.team.ui.synchronize.subscriber.SubscriberParticipant#setSubscriber(org.eclipse.team.core.subscribers.Subscriber)
 	 */
 	protected void setSubscriber(Subscriber subscriber) {
 		super.setSubscriber(subscriber);
-		if (CVSUIPlugin.getPlugin().getPluginPreferences().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS)) {
-			setSyncInfoFilter(contentComparison);
-		}
+		setSyncInfoFilter(createSyncInfoFilter());
 		try {
 			ISynchronizeParticipantDescriptor descriptor = TeamUI.getSynchronizeManager().getParticipantDescriptor(CVSCompareSubscriber.ID);
 			setInitializationData(descriptor);
@@ -90,7 +129,7 @@ public class CompareParticipant extends CVSParticipant implements IPropertyChang
 		} catch (CoreException e) {
 			CVSUIPlugin.log(e);
 		}
-		CVSUIPlugin.getPlugin().getPluginPreferences().addPropertyChangeListener(this);
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).addPreferenceChangeListener(this); //$NON-NLS-1$
 	}
 	
 	/* (non-Javadoc)
@@ -170,17 +209,18 @@ public class CompareParticipant extends CVSParticipant implements IPropertyChang
 	 */
 	public void dispose() {
 		super.dispose();
-		CVSUIPlugin.getPlugin().getPluginPreferences().removePropertyChangeListener(this);
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).removePreferenceChangeListener(this); //$NON-NLS-1$
 		getCVSCompareSubscriber().dispose();
 	}
 
 	/* (non-Javadoc)
 	 * @see org.eclipse.core.runtime.Preferences.IPropertyChangeListener#propertyChange(org.eclipse.core.runtime.Preferences.PropertyChangeEvent)
 	 */
-	public void propertyChange(PropertyChangeEvent event) {
-		if (event.getProperty().equals(ICVSUIConstants.PREF_CONSIDER_CONTENTS)) {
-			if (CVSUIPlugin.getPlugin().getPluginPreferences().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS)) {
-				setSyncInfoFilter(contentComparison);
+	public void preferenceChange(PreferenceChangeEvent event) {
+		if (event.getKey().equals(ICVSUIConstants.PREF_CONSIDER_CONTENTS) || event.getKey().equals(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN)) {
+			SyncInfoFilter filter = createSyncInfoFilter();
+			if (filter != null) {
+				setSyncInfoFilter(filter);
 			} else {
 				setSyncInfoFilter(new FastSyncInfoFilter());
 			}
diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/RegexSyncInfoFilter.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/RegexSyncInfoFilter.java
new file mode 100644
index 000000000..118562ce7
--- /dev/null
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/RegexSyncInfoFilter.java
@@ -0,0 +1,67 @@
+/*******************************************************************************

+ * Copyright (c) 2011 IBM Corporation and others.

+ * All rights reserved. This program and the accompanying materials

+ * are made available under the terms of the Eclipse Public License v1.0

+ * which accompanies this distribution, and is available at

+ * http://www.eclipse.org/legal/epl-v10.html

+ *

+ * Contributors:

+ * IBM Corporation - initial API and implementation

+ *******************************************************************************/

+package org.eclipse.team.internal.ccvs.ui.subscriber;

+

+import java.util.regex.Pattern;

+

+import org.eclipse.core.resources.IResource;

+import org.eclipse.core.runtime.IProgressMonitor;

+import org.eclipse.team.core.synchronize.SyncInfo;

+import org.eclipse.team.core.synchronize.SyncInfoFilter;

+import org.eclipse.team.core.variants.IResourceVariant;

+import org.eclipse.team.internal.core.subscribers.AbstractContentComparator;

+import org.eclipse.team.internal.ui.synchronize.RegexDiffComparator;

+

+/**

+ * Selects <code>SyncInfo</code> whose all diffs match the given pattern.

+ * This filter makes use of the <code>IStorage</code> provided by

+ * an <code>IResourceVariant</code> to obtain the remote contents.

+ * This means that the comparison may contact the server unless the contents

+ * were cached locally by a previous operation. The caching of remote

+ * contents is subscriber specific.

+ * <p>

+ * For folders, the comparison always returns <code>true</code>.

+ *

+ * @since 3.6

+ */

+public class RegexSyncInfoFilter extends SyncInfoFilter {

+

+	AbstractContentComparator criteria;

+

+	boolean ignoreWhiteSpace;

+

+	/**

+	 * Create a filter that does not ignore whitespace.

+	 *

+	 * @param pattern

+	 *            regex pattern

+	 */

+	public RegexSyncInfoFilter(String pattern) {

+		this(false, pattern);

+	}

+

+	public RegexSyncInfoFilter(boolean ignoreWhitespace, String pattern) {

+		criteria = new RegexDiffComparator(Pattern.compile(pattern,

+				Pattern.DOTALL), ignoreWhitespace);

+	}

+

+	public boolean select(SyncInfo info, IProgressMonitor monitor) {

+		IResourceVariant remote = info.getRemote();

+		IResource local = info.getLocal();

+		if (local.getType() != IResource.FILE)

+			return true;

+		if (remote == null)

+			return !local.exists();

+		if (!local.exists())

+			return false;

+		return criteria.compare(local, remote, monitor);

+	}

+}

diff --git a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/WorkspaceSynchronizeParticipant.java b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/WorkspaceSynchronizeParticipant.java
index 5f8757612..b5c219103 100644
--- a/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/WorkspaceSynchronizeParticipant.java
+++ b/bundles/org.eclipse.team.cvs.ui/src/org/eclipse/team/internal/ccvs/ui/subscriber/WorkspaceSynchronizeParticipant.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2008 IBM Corporation and others.
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -17,12 +17,16 @@ import java.util.Set;
 import org.eclipse.compare.CompareConfiguration;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.preferences.*;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener;
+import org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent;
 import org.eclipse.jface.preference.PreferencePage;
 import org.eclipse.jface.viewers.ILabelDecorator;
 import org.eclipse.jface.window.Window;
 import org.eclipse.team.core.TeamException;
 import org.eclipse.team.core.diff.IDiff;
 import org.eclipse.team.core.mapping.provider.ResourceDiffTree;
+import org.eclipse.team.core.synchronize.*;
 import org.eclipse.team.internal.ccvs.core.CVSProviderPlugin;
 import org.eclipse.team.internal.ccvs.ui.*;
 import org.eclipse.team.internal.ccvs.ui.actions.*;
@@ -33,7 +37,7 @@ import org.eclipse.team.ui.TeamUI;
 import org.eclipse.team.ui.synchronize.*;
 import org.eclipse.ui.*;
 
-public class WorkspaceSynchronizeParticipant extends ScopableSubscriberParticipant implements IChangeSetProvider {
+public class WorkspaceSynchronizeParticipant extends ScopableSubscriberParticipant implements IChangeSetProvider, IPreferenceChangeListener {
 
 	public static final String ID = "org.eclipse.team.cvs.ui.cvsworkspace-participant"; //$NON-NLS-1$
 
@@ -188,8 +192,61 @@ public class WorkspaceSynchronizeParticipant extends ScopableSubscriberParticipa
 	public WorkspaceSynchronizeParticipant(ISynchronizeScope scope) {
 		super(scope);
 		setSubscriber(CVSProviderPlugin.getPlugin().getCVSWorkspaceSubscriber());
+		SyncInfoFilter filter = createSyncInfoFilter();
+		if (filter != null) {
+			setSyncInfoFilter(filter);
+		}
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).addPreferenceChangeListener(this); //$NON-NLS-1$
 	}
-	
+
+	private boolean isConsiderContents() {
+		return CVSUIPlugin.getPlugin().getPreferenceStore().getBoolean(ICVSUIConstants.PREF_CONSIDER_CONTENTS);
+	}
+
+	private SyncInfoFilter contentComparison = new SyncInfoFilter() {
+		private SyncInfoFilter contentCompare = new SyncInfoFilter.ContentComparisonSyncInfoFilter();
+		public boolean select(SyncInfo info, IProgressMonitor monitor) {
+			// Want to select infos whose contents do not match
+			return !contentCompare.select(info, monitor);
+		}
+	};
+
+	private SyncInfoFilter createSyncInfoFilter() {
+		final SyncInfoFilter regexFilter = createRegexFilter();
+		if (isConsiderContents() && regexFilter != null) {
+			return new SyncInfoFilter() {
+				public boolean select(SyncInfo info, IProgressMonitor monitor) {
+					return contentComparison.select(info, monitor)
+							&& !regexFilter.select(info, monitor);
+				}
+			};
+		} else if (isConsiderContents()) {
+			return new SyncInfoFilter() {
+				public boolean select(SyncInfo info, IProgressMonitor monitor) {
+					return contentComparison.select(info, monitor);
+				}
+			};
+		} else if (regexFilter != null) {
+			return new SyncInfoFilter() {
+				public boolean select(SyncInfo info, IProgressMonitor monitor) {
+					// want to select infos which contain at least one unmatched difference
+					return !regexFilter.select(info, monitor);
+				}
+			};
+		}
+		return null;
+	}
+
+	private SyncInfoFilter createRegexFilter() {
+		if (isConsiderContents()) {
+			String pattern = CVSUIPlugin.getPlugin().getPreferenceStore().getString(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN);
+			if (pattern != null && !pattern.equals("")) { //$NON-NLS-1$
+				return new RegexSyncInfoFilter(pattern);
+			}
+		}
+		return null;
+	}
+
 	/* (non-Javadoc)
 	 * @see org.eclipse.team.ui.synchronize.ISynchronizeParticipant#init(org.eclipse.ui.IMemento)
 	 */
@@ -272,5 +329,23 @@ public class WorkspaceSynchronizeParticipant extends ScopableSubscriberParticipa
     public void refresh(IResource[] resources, IWorkbenchPartSite site) {
         refresh(resources, getShortTaskName(), getLongTaskName(resources), site);
     }
-    
+
+	public void dispose() {
+		super.dispose();
+		((IEclipsePreferences) CVSUIPlugin.getPlugin().getInstancePreferences().node("")).removePreferenceChangeListener(this); //$NON-NLS-1$
+	}
+
+	/* (non-Javadoc)
+	 * @see org.eclipse.core.runtime.preferences.IEclipsePreferences.IPreferenceChangeListener#preferenceChange(org.eclipse.core.runtime.preferences.IEclipsePreferences.PreferenceChangeEvent)
+	 */
+	public void preferenceChange(PreferenceChangeEvent event) {
+		if (event.getKey().equals(ICVSUIConstants.PREF_CONSIDER_CONTENTS) || event.getKey().equals(ICVSUIConstants.PREF_SYNCVIEW_REGEX_FILTER_PATTERN)) {
+			SyncInfoFilter filter = createSyncInfoFilter();
+			if (filter != null) {
+				setSyncInfoFilter(filter);
+			} else {
+				setSyncInfoFilter(new FastSyncInfoFilter());
+			}
+		}
+	}
 }
diff --git a/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/preferences/SyncViewerPreferencePage.java b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/preferences/SyncViewerPreferencePage.java
index 5c52ec805..663928ae4 100644
--- a/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/preferences/SyncViewerPreferencePage.java
+++ b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/preferences/SyncViewerPreferencePage.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2000, 2010 IBM Corporation and others.
+ * Copyright (c) 2000, 2011 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -10,7 +10,6 @@
  *******************************************************************************/
 package org.eclipse.team.internal.ui.preferences;
 
-import com.ibm.icu.text.Collator;
 import java.util.Arrays;
 import java.util.Comparator;
 
@@ -25,8 +24,10 @@ import org.eclipse.swt.widgets.*;
 import org.eclipse.team.internal.ui.*;
 import org.eclipse.ui.*;
 
+import com.ibm.icu.text.Collator;
+
 /**
- * This area provides the widgets for providing the CVS commit comment
+ * This preference page allows to configure various aspects of the Synchronize View.
  */
 public class SyncViewerPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage, IPreferenceIds {
 	
diff --git a/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RangeDifferenceComparator.java b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RangeDifferenceComparator.java
new file mode 100644
index 000000000..63839174d
--- /dev/null
+++ b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RangeDifferenceComparator.java
@@ -0,0 +1,72 @@
+/*******************************************************************************

+ * Copyright (c) 2011 IBM Corporation and others.

+ * All rights reserved. This program and the accompanying materials

+ * are made available under the terms of the Eclipse Public License v1.0

+ * which accompanies this distribution, and is available at

+ * http://www.eclipse.org/legal/epl-v10.html

+ *

+ * Contributors:

+ * IBM Corporation - initial API and implementation

+ *******************************************************************************/

+package org.eclipse.team.internal.ui.synchronize;

+

+import java.io.IOException;

+import java.io.InputStream;

+

+import org.eclipse.compare.internal.DocLineComparator;

+import org.eclipse.compare.internal.Utilities;

+import org.eclipse.compare.rangedifferencer.RangeDifference;

+import org.eclipse.compare.rangedifferencer.RangeDifferencer;

+import org.eclipse.core.resources.ResourcesPlugin;

+import org.eclipse.core.runtime.IProgressMonitor;

+import org.eclipse.jface.text.*;

+import org.eclipse.team.internal.core.subscribers.AbstractContentComparator;

+

+/**

+ * Compare differences between local and remote contents.

+ * <p>

+ * Subclass to specify a criterion for comparison.

+ */

+public abstract class RangeDifferenceComparator extends

+		AbstractContentComparator {

+

+	public RangeDifferenceComparator(boolean ignoreWhitespace) {

+		super(ignoreWhitespace);

+	}

+

+	/**

+	 * Return <code>true</code> if the provided differences match a criterion.

+	 *

+	 * @param ranges the differences found

+	 * @param lDoc the left document

+	 * @param rDoc the right document

+	 * @return <code>true</code> if all differences match a criterion

+	 */

+	abstract protected boolean compareRangeDifferences(RangeDifference[] ranges,

+			IDocument lDoc, IDocument rDoc);

+

+	protected boolean contentsEqual(IProgressMonitor monitor, InputStream is1,

+			InputStream is2, boolean ignoreWhitespace) {

+		try {

+			final String left = Utilities.readString(is1, ResourcesPlugin.getEncoding());

+			final String right = Utilities.readString(is2, ResourcesPlugin.getEncoding());

+			return compareStrings(left, right, monitor);

+		} catch (IOException e) {

+			// ignore

+		}

+		return false;

+	}

+

+	private boolean compareStrings(String left, String right,

+			IProgressMonitor monitor) {

+		IDocument lDoc = new Document(left);

+		IDocument rDoc = new Document(right);

+		DocLineComparator sleft = new DocLineComparator(lDoc, new Region(0,

+				lDoc.getLength()), shouldIgnoreWhitespace());

+		DocLineComparator sright = new DocLineComparator(rDoc, new Region(0,

+				rDoc.getLength()), shouldIgnoreWhitespace());

+		final DocLineComparator sl = sleft, sr = sright;

+		RangeDifference[] ranges = RangeDifferencer.findRanges(monitor, sl, sr);

+		return compareRangeDifferences(ranges, lDoc, rDoc);

+	}

+}

diff --git a/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RegexDiffComparator.java b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RegexDiffComparator.java
new file mode 100644
index 000000000..333b9afa1
--- /dev/null
+++ b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RegexDiffComparator.java
@@ -0,0 +1,71 @@
+/*******************************************************************************

+ * Copyright (c) 2011 IBM Corporation and others.

+ * All rights reserved. This program and the accompanying materials

+ * are made available under the terms of the Eclipse Public License v1.0

+ * which accompanies this distribution, and is available at

+ * http://www.eclipse.org/legal/epl-v10.html

+ *

+ * Contributors:

+ * IBM Corporation - initial API and implementation

+ *******************************************************************************/

+package org.eclipse.team.internal.ui.synchronize;

+

+import java.util.regex.Pattern;

+

+import org.eclipse.compare.internal.DocLineComparator;

+import org.eclipse.compare.rangedifferencer.RangeDifference;

+import org.eclipse.jface.text.*;

+

+/**

+ * Compute differences between local and remote contents and checks if all match

+ * the given regex pattern. If there is at least one diff whose either left or

+ * right side don't match the pattern

+ * <code>{@link #compareRangeDifferences(RangeDifference[], IDocument, IDocument)}</code>

+ * returns <code>false</code>.

+ */

+public class RegexDiffComparator extends RangeDifferenceComparator {

+

+	private Pattern pattern;

+

+	public RegexDiffComparator(Pattern pattern, boolean ignoreWhitespace) {

+		super(ignoreWhitespace);

+		this.pattern = pattern;

+	}

+

+	protected boolean compareRangeDifferences(RangeDifference[] ranges,

+			IDocument lDoc, IDocument rDoc) {

+		try {

+			for (int i = 0; i < ranges.length; i++) {

+				RangeDifference diff = ranges[i];

+				if (diff.kind() == RangeDifference.NOCHANGE)

+					continue;

+

+				DocLineComparator sleft = new DocLineComparator(lDoc, null,

+						shouldIgnoreWhitespace());

+				DocLineComparator sright = new DocLineComparator(rDoc, null,

+						shouldIgnoreWhitespace());

+

+				IRegion lRegion = lDoc.getLineInformation(diff.leftStart());

+				int leftEnd = sleft.getTokenStart(diff.leftStart()

+						+ diff.leftLength());

+				String left = lDoc.get(lRegion.getOffset(),

+						leftEnd - lRegion.getOffset());

+				IRegion rRegion = rDoc.getLineInformation(diff.rightStart());

+				int rightEnd = sright.getTokenStart(diff.rightStart()

+						+ diff.rightLength());

+				String right = rDoc.get(rRegion.getOffset(),

+						rightEnd - rRegion.getOffset());

+

+				boolean m1 = pattern.matcher(left).matches();

+				boolean m2 = pattern.matcher(right).matches();

+

+				if (!m1 && !m2)

+					// it's false that all diffs match the pattern

+					return false;

+			}

+		} catch (BadLocationException e) {

+			// ignore

+		}

+		return true;

+	}

+}
\ No newline at end of file
diff --git a/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RegexDiffFilter.java b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RegexDiffFilter.java
new file mode 100644
index 000000000..dce36567b
--- /dev/null
+++ b/bundles/org.eclipse.team.ui/src/org/eclipse/team/internal/ui/synchronize/RegexDiffFilter.java
@@ -0,0 +1,64 @@
+/*******************************************************************************

+ * Copyright (c) 2011 IBM Corporation and others.

+ * All rights reserved. This program and the accompanying materials

+ * are made available under the terms of the Eclipse Public License v1.0

+ * which accompanies this distribution, and is available at

+ * http://www.eclipse.org/legal/epl-v10.html

+ *

+ * Contributors:

+ * IBM Corporation - initial API and implementation

+ *******************************************************************************/

+package org.eclipse.team.internal.ui.synchronize;

+

+import java.util.regex.Pattern;

+

+import org.eclipse.core.resources.IResource;

+import org.eclipse.core.runtime.IProgressMonitor;

+import org.eclipse.team.core.diff.DiffFilter;

+import org.eclipse.team.core.diff.IDiff;

+import org.eclipse.team.core.history.IFileRevision;

+import org.eclipse.team.core.mapping.provider.ResourceDiffTree;

+import org.eclipse.team.internal.core.mapping.SyncInfoToDiffConverter;

+import org.eclipse.team.internal.core.subscribers.AbstractContentComparator;

+

+public class RegexDiffFilter extends DiffFilter {

+

+	AbstractContentComparator criteria;

+

+	boolean ignoreWhiteSpace;

+

+	/**

+	 * Create a filter that does not ignore whitespace.

+	 *

+	 * @param pattern

+	 *            regex pattern

+	 */

+	public RegexDiffFilter(String pattern) {

+		this(false, pattern);

+	}

+

+	/**

+	 * Create a filter and configure how whitespace is handled.

+	 *

+	 * @param ignoreWhitespace

+	 *            whether whitespace should be ignored

+	 * @param pattern

+	 *            regex pattern

+	 */

+	public RegexDiffFilter(boolean ignoreWhitespace, String pattern) {

+		criteria = new RegexDiffComparator(Pattern.compile(pattern,

+				Pattern.DOTALL), ignoreWhitespace);

+	}

+

+	public boolean select(IDiff diff, IProgressMonitor monitor) {

+		IFileRevision remote = SyncInfoToDiffConverter.getRemote(diff);

+		IResource local = ResourceDiffTree.getResourceFor(diff);

+		if (local == null || local.getType() != IResource.FILE)

+			return true;

+		if (remote == null)

+			return !local.exists();

+		if (!local.exists())

+			return false;

+		return criteria.compare(local, remote, monitor);

+	}

+}
\ No newline at end of file