/*******************************************************************************
* Copyright (c) 2012-2015 Codenvy, S.A.
* 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:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.eclipse.che.ide.ext.java.jdt.text.edits;
import org.eclipse.che.ide.api.text.BadLocationException;
import org.eclipse.che.ide.ext.java.jdt.text.Document;
import java.util.ArrayList;
import java.util.List;
/**
* 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.
*/
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
* @throws 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, "Source edit must not be the parent of the target."); //$NON-NLS-1$
parent = parent.getParent();
}
}
}
/* @see TextEdit#doCopy */
protected TextEdit doCopy() {
return new MoveTargetEdit(this);
}
/* @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);
}
}
/* @see TextEdit#accept0 */
protected void accept0(TextEditVisitor visitor) {
boolean visitChildren = visitor.visit(this);
if (visitChildren) {
acceptChildren(visitor);
}
}
// ---- consistency check ----------------------------------------------------------
/* @see TextEdit#traverseConsistencyCheck */
int traverseConsistencyCheck(TextEditProcessor processor, Document document, List<List<TextEdit>> sourceEdits) {
return super.traverseConsistencyCheck(processor, document, sourceEdits) + 1;
}
/* @see TextEdit#performConsistencyCheck */
void performConsistencyCheck(TextEditProcessor processor, Document document) throws MalformedTreeException {
if (fSource == null)
throw new MalformedTreeException(getParent(), this, "No source edit provided."); //$NON-NLS-1$
if (fSource.getTargetEdit() != this)
throw new MalformedTreeException(getParent(), this, "Source edit has different target edit."); //$NON-NLS-1$
}
// ---- document updating ----------------------------------------------------------------
/* @see TextEdit#performDocumentUpdating */
int performDocumentUpdating(Document 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<TextEdit> children = new ArrayList<TextEdit>(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 --------------------------------------------------------------
/* @see org.eclipse.text.edits.TextEdit#traversePassThree */
int traverseRegionUpdating(TextEditProcessor processor, Document 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;
}
boolean deleteChildren() {
return false;
}
}