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/*******************************************************************************
* Copyright (c) 2000, 2007 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.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.Assert;
/**
* Copies a tree of text edits. A text edit copier keeps a map
* between original and new text edits. It can be used to map
* a copy back to its original edit.
*
* @since 3.0
*/
public final class TextEditCopier {
private TextEdit fEdit;
private Map<TextEdit, TextEdit> fCopies;
/**
* Constructs a new <code>TextEditCopier</code> for the
* given edit. The actual copy is done by calling <code>
* perform</code>.
*
* @param edit the edit to copy
*
* @see #perform()
*/
public TextEditCopier(TextEdit edit) {
super();
Assert.isNotNull(edit);
fEdit= edit;
fCopies= new HashMap<>();
}
/**
* Performs the actual copying.
*
* @return the copy
*/
public TextEdit perform() {
TextEdit result= doCopy(fEdit);
if (result != null) {
for (Iterator<TextEdit> iter= fCopies.keySet().iterator(); iter.hasNext();) {
TextEdit edit= iter.next();
edit.postProcessCopy(this);
}
}
return result;
}
/**
* Returns the copy for the original text edit.
*
* @param original the original for which the copy
* is requested
* @return the copy of the original edit or <code>null</code>
* if the original isn't managed by this copier
*/
public TextEdit getCopy(TextEdit original) {
Assert.isNotNull(original);
return fCopies.get(original);
}
//---- helper methods --------------------------------------------
private TextEdit doCopy(TextEdit edit) {
TextEdit result= edit.doCopy();
List<TextEdit> children= edit.internalGetChildren();
if (children != null) {
List<TextEdit> newChildren= new ArrayList<>(children.size());
for (Iterator<TextEdit> iter= children.iterator(); iter.hasNext();) {
TextEdit childCopy= doCopy(iter.next());
childCopy.internalSetParent(result);
newChildren.add(childCopy);
}
result.internalSetChildren(newChildren);
}
addCopy(edit, result);
return result;
}
private void addCopy(TextEdit original, TextEdit copy) {
fCopies.put(original, copy);
}
}
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