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/*******************************************************************************
* Copyright (c) 2000, 2004 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.editors.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 line in the currently displayed document to the state in the
* reference document.
*
* @since 3.1
*/
public class RevertLineAction extends QuickDiffRestoreAction {
/** Resource key prefix. */
private static final String PREFIX= "RevertLineAction."; //$NON-NLS-1$
/** Resource key for added lines - they will be deleted. */
private static final String DELETE_KEY= PREFIX + "delete.label"; //$NON-NLS-1$
/** Resource key for changed lines - they will be reverted. */
private static final String REVERT_KEY= PREFIX + "label"; //$NON-NLS-1$
/** 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 RevertLineAction(ITextEditor editor, boolean isRulerAction) {
super(QuickDiffMessages.getResourceBundle(), 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;
if (info.getChangeType() == ILineDiffInfo.ADDED)
setText(QuickDiffMessages.getString(DELETE_KEY));
else
setText(QuickDiffMessages.getString(REVERT_KEY));
return true;
}
/*
* @see org.eclipse.ui.internal.editors.quickdiff.QuickDiffRestoreAction#runCompoundChange()
*/
public void runCompoundChange() {
if (!isEnabled())
return;
ILineDiffer differ= getDiffer();
if (differ != null) {
try {
differ.revertLine(fLine);
} catch (BadLocationException e) {
setStatus(e.getMessage());
}
}
}
}
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