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/*******************************************************************************
* Copyright (c) 2000, 2008 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.text.edits;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
/**
* This class encapsulates the reverse changes of an executed text
* edit tree. To apply an undo memento to a document use method
* <code>apply(IDocument)</code>.
* <p>
* Clients can't add additional children to an undo edit nor can they
* add an undo edit as a child to another edit. Doing so results in
* both cases in a <code>MalformedTreeException<code>.
*
* @since 3.0
* @noinstantiate This class is not intended to be instantiated by clients.
*/
public final class UndoEdit extends TextEdit {
UndoEdit() {
super(0, Integer.MAX_VALUE);
}
private UndoEdit(UndoEdit other) {
super(other);
}
@Override
void internalAdd(TextEdit child) throws MalformedTreeException {
throw new MalformedTreeException(null, this, TextEditMessages.getString("UndoEdit.no_children")); //$NON-NLS-1$
}
@Override
void aboutToBeAdded(TextEdit parent) {
throw new MalformedTreeException(parent, this, TextEditMessages.getString("UndoEdit.can_not_be_added")); //$NON-NLS-1$
}
@Override
UndoEdit dispatchPerformEdits(TextEditProcessor processor) throws BadLocationException {
return processor.executeUndo();
}
@Override
void dispatchCheckIntegrity(TextEditProcessor processor) throws MalformedTreeException {
processor.checkIntegrityUndo();
}
@Override
protected TextEdit doCopy() {
return new UndoEdit(this);
}
@Override
protected void accept0(TextEditVisitor visitor) {
boolean visitChildren= visitor.visit(this);
if (visitChildren) {
acceptChildren(visitor);
}
}
@Override
int performDocumentUpdating(IDocument document) throws BadLocationException {
fDelta= 0;
return fDelta;
}
void add(ReplaceEdit edit) {
List<TextEdit> children= internalGetChildren();
if (children == null) {
children= new ArrayList<>(2);
internalSetChildren(children);
}
children.add(edit);
}
void defineRegion(int offset, int length) {
internalSetOffset(offset);
internalSetLength(length);
}
@Override
boolean deleteChildren() {
return false;
}
}
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