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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.text.edits;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IDocument;
/**
* A move target edit denotes the target of a move operation. Move
* target edits are only valid inside an edit tree if they have a
* corresponding source edit. Furthermore a target edit can't
* can't be a direct or indirect child of its associated source edit.
* Violating one of two requirements will result in a <code>
* MalformedTreeException</code> when executing the edit tree.
* <p>
* Move target edits can't be used as a parent for other edits.
* Trying to add an edit to a move target edit results in a <code>
* MalformedTreeException</code> as well.
*
* @see org.eclipse.text.edits.MoveSourceEdit
* @see org.eclipse.text.edits.CopyTargetEdit
*
* @since 3.0
*/
public final class MoveTargetEdit extends TextEdit {
private MoveSourceEdit fSource;
/**
* Constructs a new move target edit
*
* @param offset the edit's offset
*/
public MoveTargetEdit(int offset) {
super(offset, 0);
}
/**
* Constructs an new move target edit
*
* @param offset the edit's offset
* @param source the corresponding source edit
*/
public MoveTargetEdit(int offset, MoveSourceEdit source) {
this(offset);
setSourceEdit(source);
}
/*
* Copy constructor
*/
private MoveTargetEdit(MoveTargetEdit other) {
super(other);
}
/**
* Returns the associated source edit or <code>null</code>
* if no source edit is associated yet.
*
* @return the source edit or <code>null</code>
*/
public MoveSourceEdit getSourceEdit() {
return fSource;
}
/**
* Sets the source edit.
*
* @param edit the source edit
*
* @exception MalformedTreeException is thrown if the target edit
* is a direct or indirect child of the source edit
*/
public void setSourceEdit(MoveSourceEdit edit) {
if (fSource != edit) {
fSource= edit;
fSource.setTargetEdit(this);
TextEdit parent= getParent();
while (parent != null) {
if (parent == fSource)
throw new MalformedTreeException(parent, this, TextEditMessages.getString("MoveTargetEdit.wrong_parent")); //$NON-NLS-1$
parent= parent.getParent();
}
}
}
/* non Java-doc
* @see TextEdit#doCopy
*/
protected TextEdit doCopy() {
return new MoveTargetEdit(this);
}
/* non Java-doc
* @see TextEdit#postProcessCopy
*/
protected void postProcessCopy(TextEditCopier copier) {
if (fSource != null) {
MoveTargetEdit target= (MoveTargetEdit)copier.getCopy(this);
MoveSourceEdit source= (MoveSourceEdit)copier.getCopy(fSource);
if (target != null && source != null)
target.setSourceEdit(source);
}
}
/* (non-Javadoc)
* @see TextEdit#accept0
*/
protected void accept0(TextEditVisitor visitor) {
boolean visitChildren = visitor.visit(this);
if (visitChildren) {
acceptChildren(visitor);
}
}
//---- consistency check ----------------------------------------------------------
/* non Java-doc
* @see TextEdit#traverseConsistencyCheck
*/
/* package */ int traverseConsistencyCheck(TextEditProcessor processor, IDocument document, List sourceEdits) {
return super.traverseConsistencyCheck(processor, document, sourceEdits) + 1;
}
/* non Java-doc
* @see TextEdit#performConsistencyCheck
*/
/* package */ void performConsistencyCheck(TextEditProcessor processor, IDocument document) throws MalformedTreeException {
if (fSource == null)
throw new MalformedTreeException(getParent(), this, TextEditMessages.getString("MoveTargetEdit.no_source")); //$NON-NLS-1$
if (fSource.getTargetEdit() != this)
throw new MalformedTreeException(getParent(), this, TextEditMessages.getString("MoveTargetEdit.different_target")); //$NON-NLS-1$
}
//---- document updating ----------------------------------------------------------------
/* non Java-doc
* @see TextEdit#performDocumentUpdating
*/
/* package */ int performDocumentUpdating(IDocument document) throws BadLocationException {
String source= fSource.getContent();
document.replace(getOffset(), getLength(), source);
fDelta= source.length() - getLength();
MultiTextEdit sourceRoot= fSource.getSourceRoot();
if (sourceRoot != null) {
sourceRoot.internalMoveTree(getOffset());
TextEdit[] sourceChildren= sourceRoot.removeChildren();
List children= new ArrayList(sourceChildren.length);
for (int i= 0; i < sourceChildren.length; i++) {
TextEdit child= sourceChildren[i];
child.internalSetParent(this);
children.add(child);
}
internalSetChildren(children);
}
fSource.clearContent();
return fDelta;
}
//---- region updating --------------------------------------------------------------
/* (non-Javadoc)
* @see org.eclipse.text.edits.TextEdit#traversePassThree
*/
/* package */ int traverseRegionUpdating(TextEditProcessor processor, IDocument document, int accumulatedDelta, boolean delete) {
// the children got already updated / normalized while they got removed
// from the source edit. So we only have to adjust the offset computed to
// far.
if (delete) {
deleteTree();
} else {
internalMoveTree(accumulatedDelta);
}
return accumulatedDelta + fDelta;
}
/* package */ boolean deleteChildren() {
return false;
}
}
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