path: root/org.eclipse.search/search/org/eclipse/search/internal/ui/text/TextSearchPage.java

/*******************************************************************************
 * 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.search.internal.ui.text;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IStatus;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.ResourcesPlugin;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.CLabel;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;

import org.eclipse.jface.dialogs.Dialog;
import org.eclipse.jface.dialogs.DialogPage;
import org.eclipse.jface.dialogs.ErrorDialog;
import org.eclipse.jface.dialogs.IDialogSettings;
import org.eclipse.jface.resource.JFaceColors;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.text.Assert;
import org.eclipse.jface.text.ITextSelection;

import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.IFileEditorInput;
import org.eclipse.ui.IWorkingSet;
import org.eclipse.ui.IWorkingSetManager;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.contentassist.ContentAssistHandler;

import org.eclipse.search.ui.IReplacePage;
import org.eclipse.search.ui.ISearchPage;
import org.eclipse.search.ui.ISearchPageContainer;
import org.eclipse.search.ui.ISearchQuery;
import org.eclipse.search.ui.ISearchResultPage;
import org.eclipse.search.ui.ISearchResultViewPart;
import org.eclipse.search.ui.NewSearchUI;
import org.eclipse.search.ui.text.FileTextSearchScope;
import org.eclipse.search.ui.text.TextSearchQueryProvider;
import org.eclipse.search.ui.text.TextSearchQueryProvider.TextSearchInput;

import org.eclipse.search.internal.ui.ISearchHelpContextIds;
import org.eclipse.search.internal.ui.SearchMessages;
import org.eclipse.search.internal.ui.SearchPlugin;
import org.eclipse.search.internal.ui.util.FileTypeEditor;
import org.eclipse.search.internal.ui.util.SWTUtil;


public class TextSearchPage extends DialogPage implements ISearchPage, IReplacePage {

    private static final int HISTORY_SIZE= 12;
	public static final String EXTENSION_POINT_ID= "org.eclipse.search.internal.ui.text.TextSearchPage"; //$NON-NLS-1$

	// Dialog store id constants
	private static final String PAGE_NAME= "TextSearchPage"; //$NON-NLS-1$
	private static final String STORE_CASE_SENSITIVE= "CASE_SENSITIVE"; //$NON-NLS-1$
	private static final String STORE_IS_REG_EX_SEARCH= "REG_EX_SEARCH"; //$NON-NLS-1$
	private static final String STORE_SEARCH_DERIVED = "SEARCH_DERIVED"; //$NON-NLS-1$
	private static final String STORE_HISTORY= "HISTORY"; //$NON-NLS-1$
	private static final String STORE_HISTORY_SIZE= "HISTORY_SIZE"; //$NON-NLS-1$

	private List fPreviousSearchPatterns= new ArrayList(20);

	private boolean fFirstTime= true;
	private boolean fIsCaseSensitive;
	private boolean fIsRegExSearch;
	private boolean fSearchDerived;
	
	private Combo fPattern;
	private Button fIsCaseSensitiveCheckbox;
	private Combo fExtensions;
	private Button fIsRegExCheckbox;
	private CLabel fStatusLabel;
	private Button fSearchDerivedCheckbox;

	private ISearchPageContainer fContainer;
	private FileTypeEditor fFileTypeEditor;

	private ContentAssistHandler fReplaceContentAssistHandler;
    
	private static class SearchPatternData {
		public final boolean isCaseSensitive;
		public final boolean isRegExSearch;
		public final String textPattern;
		public final String[] fileNamePatterns;
		public final int scope;
		public final IWorkingSet[] workingSets;
		
		public SearchPatternData(String textPattern, boolean isCaseSensitive, boolean isRegExSearch, String[] fileNamePatterns, int scope, IWorkingSet[] workingSets) {
			Assert.isNotNull(fileNamePatterns);
			this.isCaseSensitive= isCaseSensitive;
			this.isRegExSearch= isRegExSearch;
			this.textPattern= textPattern;
			this.fileNamePatterns= fileNamePatterns;
			this.scope= scope;
			this.workingSets= workingSets; // can be null
		}
		
		public void store(IDialogSettings settings) {
			settings.put("ignoreCase", !isCaseSensitive); //$NON-NLS-1$
			settings.put("isRegExSearch", isRegExSearch); //$NON-NLS-1$
			settings.put("textPattern", textPattern); //$NON-NLS-1$
			settings.put("fileNamePatterns", fileNamePatterns); //$NON-NLS-1$
			settings.put("scope", scope); //$NON-NLS-1$
			if (workingSets != null) {
				String[] wsIds= new String[workingSets.length];
				for (int i= 0; i < workingSets.length; i++) {
					wsIds[i]= workingSets[i].getLabel();
				}
				settings.put("workingSets", wsIds); //$NON-NLS-1$
			} else {
				settings.put("workingSets", new String[0]); //$NON-NLS-1$
			}

		}
		
		public static SearchPatternData create(IDialogSettings settings) {
			String textPattern= settings.get("textPattern"); //$NON-NLS-1$
			String[] wsIds= settings.getArray("workingSets"); //$NON-NLS-1$
			IWorkingSet[] workingSets= null;
			if (wsIds != null && wsIds.length > 0) {
				IWorkingSetManager workingSetManager= PlatformUI.getWorkbench().getWorkingSetManager();
				workingSets= new IWorkingSet[wsIds.length];
				for (int i= 0; workingSets != null && i < wsIds.length; i++) {
					workingSets[i]= workingSetManager.getWorkingSet(wsIds[i]);
					if (workingSets[i] == null) {
						workingSets= null;
					}
				}
			}
			String[] fileNamePatterns= settings.getArray("fileNamePatterns"); //$NON-NLS-1$
			if (fileNamePatterns == null) {
				fileNamePatterns= new String[0];
			}
			try {
				int scope= settings.getInt("scope"); //$NON-NLS-1$
				boolean isRegExSearch= settings.getBoolean("isRegExSearch"); //$NON-NLS-1$
				boolean ignoreCase= settings.getBoolean("ignoreCase"); //$NON-NLS-1$

				return	new SearchPatternData(textPattern, !ignoreCase, isRegExSearch, fileNamePatterns, scope, workingSets);
			} catch (NumberFormatException e) {
				return null;
			}
		}

		public String getPattern() {
			return textPattern;
		}

		public boolean isCaseSensitive() {
			return isCaseSensitive;
		}

		public boolean isRegExSearch() {
			return isRegExSearch;
		}

		public boolean isStringMatcherPattern() {
			return !isRegExSearch;
		}
	}
	
	private static class TextSearchPageInput extends TextSearchInput {
		
		private final String fSearchText;
		private final boolean fIsCaseSensitive;
		private final boolean fIsRegEx;
		private final FileTextSearchScope fScope;

		public TextSearchPageInput(String searchText, boolean isCaseSensitive, boolean isRegEx, FileTextSearchScope scope) {
			fSearchText= searchText;
			fIsCaseSensitive= isCaseSensitive;
			fIsRegEx= isRegEx;
			fScope= scope;
		}

		public String getSearchText() {
			return fSearchText;
		}

		public boolean isCaseSensitiveSearch() {
			return fIsCaseSensitive;
		}

		public boolean isRegExSearch() {
			return fIsRegEx;
		}

		public FileTextSearchScope getScope() {
			return fScope;
		}
	}
	
	//---- Action Handling ------------------------------------------------
	
	private ISearchQuery newQuery() throws CoreException {
		SearchPatternData data= getPatternData();
		TextSearchPageInput input= new TextSearchPageInput(data.textPattern, data.isCaseSensitive, data.isRegExSearch, createTextSearchScope());
		return TextSearchQueryProvider.getPreferred().createQuery(input);
	}
	
	public boolean performAction() {
		try {
			NewSearchUI.runQueryInBackground(newQuery());
		} catch (CoreException e) {
			ErrorDialog.openError(getShell(), SearchMessages.TextSearchPage_replace_searchproblems_title, SearchMessages.TextSearchPage_replace_searchproblems_message, e.getStatus());
			return false;
		}
 		return true;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.search.ui.IReplacePage#performReplace()
	 */
	public boolean performReplace() {
		try {
			IStatus status= NewSearchUI.runQueryInForeground(getContainer().getRunnableContext(), newQuery());
			if (status.matches(IStatus.CANCEL)) {
				return false;
			}
			if (!status.isOK()) {
				ErrorDialog.openError(getShell(), SearchMessages.TextSearchPage_replace_searchproblems_title, SearchMessages.TextSearchPage_replace_runproblem_message, status);
			}
			
			
			Display.getCurrent().asyncExec(new Runnable() {
				public void run() {
					ISearchResultViewPart view= NewSearchUI.activateSearchResultView();
					if (view != null) {
						ISearchResultPage page= view.getActivePage();
						if (page instanceof FileSearchPage) {
							FileSearchPage filePage= (FileSearchPage) page;
							Object[] elements= filePage.getInput().getElements();
							IFile[] files= new IFile[elements.length];
							System.arraycopy(elements, 0, files, 0, files.length);
							new ReplaceAction2(filePage, files).run();
						}
					}
				}
			});
			return true;
		} catch (CoreException e) {
			ErrorDialog.openError(getShell(), SearchMessages.TextSearchPage_replace_searchproblems_title, SearchMessages.TextSearchPage_replace_querycreationproblem_message, e.getStatus());
			return false;
		}
	}

	private String getPattern() {
		return fPattern.getText();
	}
	
	public FileTextSearchScope createTextSearchScope() {
		// Setup search scope
		switch (getContainer().getSelectedScope()) {
			case ISearchPageContainer.WORKSPACE_SCOPE:
				return FileTextSearchScope.newWorkspaceScope(getExtensions(), fSearchDerived);
			case ISearchPageContainer.SELECTION_SCOPE:
				return getSelectedResourcesScope();
			case ISearchPageContainer.SELECTED_PROJECTS_SCOPE:
				return getEnclosingProjectScope();
			case ISearchPageContainer.WORKING_SET_SCOPE:
				IWorkingSet[] workingSets= getContainer().getSelectedWorkingSets();
				return FileTextSearchScope.newSearchScope(workingSets, getExtensions(), fSearchDerived);
			default:
				// unknown scope
				return FileTextSearchScope.newWorkspaceScope(getExtensions(), fSearchDerived);
		}
	}
	
	private FileTextSearchScope getSelectedResourcesScope() {
		HashSet resources= new HashSet();
		ISelection sel= getContainer().getSelection();
		if (sel instanceof IStructuredSelection && !sel.isEmpty()) {
			Iterator iter= ((IStructuredSelection) sel).iterator();
			while (iter.hasNext()) {
				Object curr= iter.next();
				if (curr instanceof IWorkingSet) {
					IWorkingSet workingSet= (IWorkingSet) curr;
					if (workingSet.isAggregateWorkingSet() && workingSet.isEmpty()) {
						return FileTextSearchScope.newWorkspaceScope(getExtensions(), fSearchDerived);
					}
					IAdaptable[] elements= workingSet.getElements();
					for (int i= 0; i < elements.length; i++) {
						IResource resource= (IResource)elements[i].getAdapter(IResource.class);
						if (resource != null && resource.isAccessible()) {
							resources.add(resource);
						}
					}
				} else if (curr instanceof IAdaptable) {
					IResource resource= (IResource) ((IAdaptable)curr).getAdapter(IResource.class);
					if (resource != null && resource.isAccessible()) {
						resources.add(resource);
					}
				}
			}
		}
		IResource[] arr= (IResource[]) resources.toArray(new IResource[resources.size()]);
		return FileTextSearchScope.newSearchScope(arr, getExtensions(), fSearchDerived);
	}

	private FileTextSearchScope getEnclosingProjectScope() {
		String[] enclosingProjectName= getContainer().getSelectedProjectNames();
		if (enclosingProjectName == null) {
			return FileTextSearchScope.newWorkspaceScope(getExtensions(), fSearchDerived);
		}
		
		IWorkspaceRoot root= ResourcesPlugin.getWorkspace().getRoot();
		IResource[] res= new IResource[enclosingProjectName.length];
		for (int i= 0; i < res.length; i++) {
			res[i]= root.getProject(enclosingProjectName[i]);
		}
		
		return FileTextSearchScope.newSearchScope(res, getExtensions(), fSearchDerived);
	}

	
	private SearchPatternData findInPrevious(String pattern) {
		for (Iterator iter= fPreviousSearchPatterns.iterator(); iter.hasNext();) {
			SearchPatternData element= (SearchPatternData) iter.next();
			if (pattern.equals(element.textPattern)) {
				return element;
			}
		}
		return null;
	}

	/**
	 * Return search pattern data and update previous searches.
	 * An existing entry will be updated.
	 * @return the search pattern data
	 */
	private SearchPatternData getPatternData() {
		SearchPatternData match= findInPrevious(fPattern.getText());
		if (match != null) {
			fPreviousSearchPatterns.remove(match);
		}
		match= new SearchPatternData(
					getPattern(),
					isCaseSensitive(),
					fIsRegExCheckbox.getSelection(),
					getExtensions(),
					getContainer().getSelectedScope(),
					getContainer().getSelectedWorkingSets());
		fPreviousSearchPatterns.add(0, match);
		return match;
	}

	private String[] getPreviousExtensions() {
		List extensions= new ArrayList(fPreviousSearchPatterns.size());
		int size= fPreviousSearchPatterns.size();
		for (int i= 0; i < size; i++) {
			SearchPatternData data= (SearchPatternData) fPreviousSearchPatterns.get(i);
			String text= FileTypeEditor.typesToString(data.fileNamePatterns);
			if (!extensions.contains(text))
				extensions.add(text);
		}
		return (String[]) extensions.toArray(new String[extensions.size()]);
	}

	private String[] getPreviousSearchPatterns() {
		int size= fPreviousSearchPatterns.size();
		String [] patterns= new String[size];
		for (int i= 0; i < size; i++)
			patterns[i]= ((SearchPatternData) fPreviousSearchPatterns.get(i)).textPattern;
		return patterns;
	}
		
	private String[] getExtensions() {
		return fFileTypeEditor.getFileTypes();
	}

	private boolean isCaseSensitive() {
		return fIsCaseSensitiveCheckbox.getSelection();
	}

	/*
	 * Implements method from IDialogPage
	 */
	public void setVisible(boolean visible) {
		if (visible && fPattern != null) {
			if (fFirstTime) {
				fFirstTime= false;
				// Set item and text here to prevent page from resizing
				fPattern.setItems(getPreviousSearchPatterns());
				fExtensions.setItems(getPreviousExtensions());
//				if (fExtensions.getItemCount() == 0) {
//					loadFilePatternDefaults();
//				}
				if (!initializePatternControl()) {
					fPattern.select(0);
					fExtensions.setText("*"); //$NON-NLS-1$
					handleWidgetSelected();
				}
			}
			fPattern.setFocus();
		}
		updateOKStatus();
		super.setVisible(visible);
	}
	
	final void updateOKStatus() {
		boolean regexStatus= validateRegex();
		boolean hasFilePattern= fExtensions.getText().length() > 0;
		getContainer().setPerformActionEnabled(regexStatus && hasFilePattern);
	}

	//---- Widget creation ------------------------------------------------

	public void createControl(Composite parent) {
		initializeDialogUnits(parent);
		readConfiguration();
		
		Composite result= new Composite(parent, SWT.NONE);
		result.setFont(parent.getFont());
		GridLayout layout= new GridLayout(2, false);
		result.setLayout(layout);
		
		addTextPatternControls(result);
		
		Label separator= new Label(result, SWT.NONE);
		separator.setVisible(false);
		GridData data= new GridData(GridData.FILL, GridData.FILL, false, false, 2, 1);
		data.heightHint= convertHeightInCharsToPixels(1) / 3;
		separator.setLayoutData(data);
		
		addFileNameControls(result);

		setControl(result);
		Dialog.applyDialogFont(result);
		PlatformUI.getWorkbench().getHelpSystem().setHelp(result, ISearchHelpContextIds.TEXT_SEARCH_PAGE);
}
	
	private boolean validateRegex() {
		if (fIsRegExCheckbox.getSelection()) {
			try {
				Pattern.compile(fPattern.getText());
			} catch (PatternSyntaxException e) {
				String locMessage= e.getLocalizedMessage();
				int i= 0;
				while (i < locMessage.length() && "\n\r".indexOf(locMessage.charAt(i)) == -1) { //$NON-NLS-1$
					i++;
				}
				statusMessage(true, locMessage.substring(0, i)); // only take first line
				return false;
			}
			statusMessage(false, ""); //$NON-NLS-1$
		} else {
			statusMessage(false, SearchMessages.SearchPage_containingText_hint); 
		}
		return true;
	}

	private void addTextPatternControls(Composite group) {
		// grid layout with 2 columns

		// Info text		
		Label label= new Label(group, SWT.LEAD);
		label.setText(SearchMessages.SearchPage_containingText_text); 
		label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
		label.setFont(group.getFont());

		// Pattern combo
		fPattern= new Combo(group, SWT.SINGLE | SWT.BORDER);
		// Not done here to prevent page from resizing
		// fPattern.setItems(getPreviousSearchPatterns());
		fPattern.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				handleWidgetSelected();
				updateOKStatus();
			}
		});
		// add some listeners for regex syntax checking
		fPattern.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				updateOKStatus();
			}
		});
		fPattern.setFont(group.getFont());
		GridData data= new GridData(GridData.FILL, GridData.FILL, true, false, 1, 1);
		data.widthHint= convertWidthInCharsToPixels(50);
		fPattern.setLayoutData(data);
		
		fIsCaseSensitiveCheckbox= new Button(group, SWT.CHECK);
		fIsCaseSensitiveCheckbox.setText(SearchMessages.SearchPage_caseSensitive); 
		fIsCaseSensitiveCheckbox.setSelection(fIsCaseSensitive);
		fIsCaseSensitiveCheckbox.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				fIsCaseSensitive= fIsCaseSensitiveCheckbox.getSelection();
			}
		});
		fIsCaseSensitiveCheckbox.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
		fIsCaseSensitiveCheckbox.setFont(group.getFont());

		// Text line which explains the special characters
		fStatusLabel= new CLabel(group, SWT.LEAD);
		fStatusLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false, 1, 1));
		fStatusLabel.setFont(group.getFont());
		fStatusLabel.setAlignment(SWT.LEFT);
		fStatusLabel.setText(SearchMessages.SearchPage_containingText_hint); 

		// RegEx checkbox
		fIsRegExCheckbox= new Button(group, SWT.CHECK);
		fIsRegExCheckbox.setText(SearchMessages.SearchPage_regularExpression); 
		fIsRegExCheckbox.setSelection(fIsRegExSearch);
		setContentAssistsEnablement(fIsRegExSearch);
		fIsRegExCheckbox.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				fIsRegExSearch= fIsRegExCheckbox.getSelection();
				updateOKStatus();

				writeConfiguration();
				setContentAssistsEnablement(fIsRegExSearch);
			}
		});
		fIsRegExCheckbox.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
		fIsRegExCheckbox.setFont(group.getFont());
	}

	private void handleWidgetSelected() {
		int selectionIndex= fPattern.getSelectionIndex();
		if (selectionIndex < 0 || selectionIndex >= fPreviousSearchPatterns.size())
			return;
		
		SearchPatternData patternData= (SearchPatternData) fPreviousSearchPatterns.get(selectionIndex);
		if (!fPattern.getText().equals(patternData.textPattern))
			return;
		fIsCaseSensitiveCheckbox.setSelection(patternData.isCaseSensitive);
		fIsRegExCheckbox.setSelection(patternData.isRegExSearch);
		fPattern.setText(patternData.textPattern);
		fFileTypeEditor.setFileTypes(patternData.fileNamePatterns);
		if (patternData.workingSets != null)
			getContainer().setSelectedWorkingSets(patternData.workingSets);
		else
			getContainer().setSelectedScope(patternData.scope);
	}

	private boolean initializePatternControl() {
		ISelection selection= getSelection();
		if (selection instanceof ITextSelection && !selection.isEmpty()) {
			String text= ((ITextSelection) selection).getText();
			if (text != null) {
				fPattern.setText(insertEscapeChars(text));
				
				if (getPreviousExtensions().length > 0) {
					fExtensions.setText(getPreviousExtensions()[0]);
				} else {
					String extension= getExtensionFromEditor();
					if (extension != null)
						fExtensions.setText(extension);
					else 
						fExtensions.setText("*"); //$NON-NLS-1$
				}
				return true;
			}
		}
		return false;
	}
	
//	private void loadFilePatternDefaults() {
//		SearchMatchInformationProviderRegistry registry= SearchPlugin.getDefault().getSearchMatchInformationProviderRegistry();
//		String[] defaults= registry.getDefaultFilePatterns();
//		fExtensions.setItems(defaults);
//		fExtensions.setText(defaults[0]);
//	}

	private String insertEscapeChars(String text) {
		if (text == null || text.equals("")) //$NON-NLS-1$
			return ""; //$NON-NLS-1$
		StringBuffer sbIn= new StringBuffer(text);
		BufferedReader reader= new BufferedReader(new StringReader(text));
		int lengthOfFirstLine= 0;
		try {
			lengthOfFirstLine= reader.readLine().length();
		} catch (IOException ex) {
			return ""; //$NON-NLS-1$
		}
		StringBuffer sbOut= new StringBuffer(lengthOfFirstLine + 5);
		int i= 0;
		while (i < lengthOfFirstLine) {
			char ch= sbIn.charAt(i);
			if (ch == '*' || ch == '?' || ch == '\\')
				sbOut.append("\\"); //$NON-NLS-1$
			sbOut.append(ch);
			i++;
		}
		return sbOut.toString();
	}

	private String getExtensionFromEditor() {
		IEditorPart ep= SearchPlugin.getActivePage().getActiveEditor();
		if (ep != null) {
			Object elem= ep.getEditorInput();
			if (elem instanceof IFileEditorInput) {
				String extension= ((IFileEditorInput)elem).getFile().getFileExtension();
				if (extension == null)
					return ((IFileEditorInput)elem).getFile().getName();
				return "*." + extension; //$NON-NLS-1$
			}
		}
		return null;
	}

	private void addFileNameControls(Composite group) {
		// grid layout with 2 columns
		
		// Line with label, combo and button
		Label label= new Label(group, SWT.LEAD);
		label.setText(SearchMessages.SearchPage_fileNamePatterns_text); 
		label.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
		label.setFont(group.getFont());
		
		fExtensions= new Combo(group, SWT.SINGLE | SWT.BORDER);
		fExtensions.addModifyListener(new ModifyListener() {
			public void modifyText(ModifyEvent e) {
				updateOKStatus();
			}
		});
		GridData data= new GridData(GridData.FILL, GridData.FILL, true, false, 1, 1);
		data.widthHint= convertWidthInCharsToPixels(50);
		fExtensions.setLayoutData(data);
		fExtensions.setFont(group.getFont());
		
		Button button= new Button(group, SWT.PUSH);
		button.setText(SearchMessages.SearchPage_browse); 
		GridData gridData= new GridData(SWT.BEGINNING, SWT.CENTER, false, false, 1, 1);
		gridData.widthHint= SWTUtil.getButtonWidthHint(button);	
		button.setLayoutData(gridData);
		button.setFont(group.getFont());
		
		IEditorRegistry editorRegistry= SearchPlugin.getDefault().getWorkbench().getEditorRegistry();
		fFileTypeEditor= new FileTypeEditor(editorRegistry, fExtensions, button);
		
		// Text line which explains the special characters
		Label description= new Label(group, SWT.LEAD);
		description.setText(SearchMessages.SearchPage_fileNamePatterns_hint); 
		description.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
		description.setFont(group.getFont());
		
		fSearchDerivedCheckbox= new Button(group, SWT.CHECK);
		fSearchDerivedCheckbox.setText(SearchMessages.TextSearchPage_searchDerived_label); 
		
		fSearchDerivedCheckbox.setSelection(fSearchDerived);
		fSearchDerivedCheckbox.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				fSearchDerived= fSearchDerivedCheckbox.getSelection();
				writeConfiguration();
			}
		});
		fSearchDerivedCheckbox.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 2, 1));
		fSearchDerivedCheckbox.setFont(group.getFont());
  	}

	/**
	 * Sets the search page's container.
	 * @param container the container to set
	 */
	public void setContainer(ISearchPageContainer container) {
		fContainer= container;
	}
	
	private ISearchPageContainer getContainer() {
		return fContainer;
	}
	
	private ISelection getSelection() {
		return fContainer.getSelection();
	}
		

	//--------------- Configuration handling --------------
	
    /* (non-Javadoc)
	 * @see org.eclipse.jface.dialogs.DialogPage#dispose()
	 */
	public void dispose() {
		writeConfiguration();
		super.dispose();
	}
	
	/**
	 * Returns the page settings for this Text search page.
	 * 
	 * @return the page settings to be used
	 */
	private IDialogSettings getDialogSettings() {
		return SearchPlugin.getDefault().getDialogSettingsSection(PAGE_NAME);
	}
		
	
	/**
	 * Initializes itself from the stored page settings.
	 */
	private void readConfiguration() {
		IDialogSettings s= getDialogSettings();
		fIsCaseSensitive= s.getBoolean(STORE_CASE_SENSITIVE);
		fIsRegExSearch= s.getBoolean(STORE_IS_REG_EX_SEARCH);
		fSearchDerived= s.getBoolean(STORE_SEARCH_DERIVED);
		
		try {
			int historySize= s.getInt(STORE_HISTORY_SIZE);
			for (int i= 0; i < historySize; i++) {
				IDialogSettings histSettings= s.getSection(STORE_HISTORY + i);
				if (histSettings != null) {
					SearchPatternData data= SearchPatternData.create(histSettings);
					if (data != null) {
						fPreviousSearchPatterns.add(data);
					}
				}
			}
		} catch (NumberFormatException e) {
			// ignore
		}
	}
	
	/**
	 * Stores it current configuration in the dialog store.
	 */
	private void writeConfiguration() {
		IDialogSettings s= getDialogSettings();
		s.put(STORE_CASE_SENSITIVE, fIsCaseSensitive);
		s.put(STORE_IS_REG_EX_SEARCH, fIsRegExSearch);
		s.put(STORE_SEARCH_DERIVED, fSearchDerived);
		
		int historySize= Math.min(fPreviousSearchPatterns.size(), HISTORY_SIZE);
		s.put(STORE_HISTORY_SIZE, historySize);
		for (int i= 0; i < historySize; i++) {
			IDialogSettings histSettings= s.addNewSection(STORE_HISTORY + i);
			SearchPatternData data= ((SearchPatternData) fPreviousSearchPatterns.get(i));
			data.store(histSettings);
		}
	}
	
	private void setContentAssistsEnablement(boolean enable) {
		if (enable) {
			if (fReplaceContentAssistHandler == null) {
				fReplaceContentAssistHandler= ContentAssistHandler.createHandlerForCombo(fPattern, ReplaceDialog2.createContentAssistant(true));
			}
			fReplaceContentAssistHandler.setEnabled(true);
		} else {
			if (fReplaceContentAssistHandler == null)
				return;
			fReplaceContentAssistHandler.setEnabled(false);
		}
	}

	private void statusMessage(boolean error, String message) {
		fStatusLabel.setText(message);
		if (error)
			fStatusLabel.setForeground(JFaceColors.getErrorText(fStatusLabel.getDisplay()));
		else
			fStatusLabel.setForeground(null);
	}

}