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AspectJ tools most notably contains the AspectJ compiler (AJC). AJC applies aspects to Java classes during compilation, fully replacing Javac for plain Java classes and also compiling native AspectJ or annotation-based @AspectJ syntax. Furthermore, AJC can weave aspects into existing class files in a post-compile binary weaving step. This library is a superset of AspectJ weaver and hence also of AspectJ runtime.

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/*******************************************************************************
 * Copyright (c) 2000, 2007 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.text.edits;

import java.util.ArrayList;
import java.util.HashMap;
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 fCopies;

	/**
	 * Constructs a new TextEditCopier for the
	 * given edit. The actual copy is done by calling 
	 * perform.
	 *
	 * @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 (TextEdit edit : fCopies.keySet()) {
				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 null
	 *  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 children= edit.internalGetChildren();
		if (children != null) {
			List newChildren= new ArrayList<>(children.size());
			for (TextEdit textEdit : children) {
				TextEdit childCopy= doCopy(textEdit);
				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);
	}
}