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/*******************************************************************************
* Copyright (c) 2000, 2010 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.ui.internal.editors.text;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.expressions.IEvaluationContext;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.filebuffers.FileBuffers;
import org.eclipse.core.filebuffers.ITextFileBufferManager;
import org.eclipse.core.filebuffers.manipulation.RemoveTrailingWhitespaceOperation;
import org.eclipse.jface.window.Window;
import org.eclipse.jface.text.ITextSelection;
import org.eclipse.ui.ISources;
import org.eclipse.ui.internal.editors.text.SelectResourcesDialog.IFilter;
import org.eclipse.ui.editors.text.FileBufferOperationHandler;
/**
* A file buffer operation action that removes trailing whitespace.
*
* @since 3.1
*/
public class RemoveTrailingWhitespaceHandler extends FileBufferOperationHandler {
/** @since 3.7 */
private boolean fStrictCheckIfTextLocation= true;
public RemoveTrailingWhitespaceHandler() {
super(new RemoveTrailingWhitespaceOperation());
}
@Override
protected boolean isAcceptableLocation(IPath location) {
ITextFileBufferManager manager= FileBuffers.getTextFileBufferManager();
return location != null && manager.isTextFileLocation(location, fStrictCheckIfTextLocation);
}
@Override
protected IFile[] collectFiles(IResource[] resources) {
IFile[] files= super.collectFiles(resources);
files= filterUnacceptableFiles(files);
if (containsOnlyFiles(resources))
return files;
final IFilter filter= new IFilter() {
@Override
public boolean accept(IResource resource) {
return resource != null && isAcceptableLocation(resource.getFullPath());
}
};
SelectResourcesDialog dialog= new SelectResourcesDialog(getShell(), TextEditorMessages.RemoveTrailingWhitespaceHandler_dialog_title, TextEditorMessages.RemoveTrailingWhitespaceHandler_dialog_description, filter);
dialog.setInput(resources);
int result= dialog.open();
if (Window.OK == result) {
IResource[] selectedResources= dialog.getSelectedResources();
return super.collectFiles(selectedResources);
}
return null;
}
/**
* Checks whether the given resources array contains
* only files.
*
* @param resources the array with the resources
* @return <code>true</code> if there array only contains <code>IFiles</code>s
* @since 3.2
*/
private boolean containsOnlyFiles(IResource[] resources) {
for (int i= 0; i < resources.length; i++) {
IResource resource= resources[i];
if ((IResource.FILE & resource.getType()) == 0)
return false;
}
return true;
}
/**
* Filters the unacceptable files.
*
* @param files the files to filter
* @return an array of files
* @since 3.2
*/
private IFile[] filterUnacceptableFiles(IFile[] files) {
Set<IFile> filtered= new HashSet<>();
for (int i= 0; i < files.length; i++) {
IFile file= files[i];
if (isAcceptableLocation(file.getFullPath()))
filtered.add(file);
}
return filtered.toArray(new IFile[filtered.size()]);
}
@Override
public void setEnabled(Object evaluationContext) {
fStrictCheckIfTextLocation= true;
if (evaluationContext instanceof IEvaluationContext) {
Object selection= ((IEvaluationContext)evaluationContext).getVariable(ISources.ACTIVE_CURRENT_SELECTION_NAME);
fStrictCheckIfTextLocation= !(selection instanceof ITextSelection);
}
super.setEnabled(evaluationContext);
}
}
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