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/*******************************************************************************
* Copyright (c) 2000, 2006 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.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;
/**
* This is an internal class that is used by the <code>ContentComparisonSyncInfoFilter</code>
* to compare the contents of the local and remote resources
*/
public class ContentComparator {
private boolean ignoreWhitespace = false;
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;
}
/**
* Returns <code>true</code> if both input streams byte contents is
* identical.
*
* @param input1
* first input to contents compare
* @param input2
* second input to contents compare
* @return <code>true</code> if content is equal
*/
private boolean contentsEqual(InputStream is1, InputStream is2, boolean ignoreWhitespace) {
try {
if (is1 == is2)
return true;
if (is1 == null && is2 == null) // no byte contents
return true;
if (is1 == null || is2 == null) // only one has
// contents
return false;
while (true) {
int c1 = is1.read();
while (shouldIgnoreWhitespace() && isWhitespace(c1))
c1 = is1.read();
int c2 = is2.read();
while (shouldIgnoreWhitespace() && isWhitespace(c2))
c2 = is2.read();
if (c1 == -1 && c2 == -1)
return true;
if (c1 != c2)
break;
}
} catch (IOException ex) {
} finally {
try {
try {
if (is1 != null) {
is1.close();
}
} finally {
if (is2 != null) {
is2.close();
}
}
} catch (IOException e) {
// Ignore
}
}
return false;
}
private boolean isWhitespace(int c) {
if (c == -1)
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);
}
}
}
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