/*******************************************************************************
* Copyright (c) 2000, 2005 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.ui.internal.texteditor.quickdiff;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.source.ILineDiffInfo;
import org.eclipse.jface.text.source.ILineDiffer;
import org.eclipse.ui.texteditor.ITextEditor;
/**
* Action that will revert a contiguous block of added, deleted and changes lines in the currently
* displayed document to the state in the reference document.
*
* @since 3.0
*/
public class RevertBlockAction extends QuickDiffRestoreAction {
/** Resource key prefix. */
private static final String PREFIX= "RevertBlockAction."; //$NON-NLS-1$
/** The line to be restored. Set in <code>update()</code>. */
private int fLine;
/**
* Creates a new instance.
*
* @param editor the editor this action belongs to
* @param isRulerAction <code>true</code> if this is a ruler action
*/
public RevertBlockAction(ITextEditor editor, boolean isRulerAction) {
super(PREFIX, editor, isRulerAction);
}
/*
* @see org.eclipse.ui.internal.texteditor.quickdiff.QuickDiffRestoreAction#computeEnablement()
*/
public boolean computeEnablement() {
if (!super.computeEnablement())
return false;
fLine= getLastLine();
if (fLine == -1)
return false;
ILineDiffer differ= getDiffer();
if (differ == null)
return false;
ILineDiffInfo info= differ.getLineInfo(fLine);
if (info == null || info.getChangeType() == ILineDiffInfo.UNCHANGED)
return false;
boolean hasBlock= false;
if (fLine > 0) {
info= differ.getLineInfo(fLine - 1);
hasBlock= info != null && info.hasChanges();
}
if (!hasBlock) {
info= differ.getLineInfo(fLine + 1);
hasBlock= info != null && info.hasChanges();
}
if (hasBlock)
return true;
return false;
}
/*
* @see org.eclipse.ui.internal.editors.quickdiff.QuickDiffRestoreAction#runCompoundChange()
*/
public void runCompoundChange() {
if (!isEnabled())
return;
ILineDiffer differ= getDiffer();
if (differ != null) {
try {
differ.revertBlock(fLine);
} catch (BadLocationException e) {
setStatus(e.getMessage());
}
}
}
}