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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, 2009 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.aspectj.org.eclipse.jdt.internal.core.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.function.Function;

/**
 * The SortOperation takes a collection of objects and returns
 * a sorted collection of these objects. The sorting of these
 * objects is based on their toString(). They are sorted in
 * alphabetical order.
 */
public class ToStringSorter  {
	private final Function toString;

	public ToStringSorter(Function toString) {
		this.toString = toString;
	}

	static class Pair implements Comparable> {
		final T object;
		final String string;
		public Pair(T k, String s) {
			this.object = k;
			this.string = s;
		}

		@Override
		public int compareTo(Pair other) {
			return this.string.compareTo(other.string);
		}
	}

	/**
	 *  Return a new sorted collection from this unsorted collection.
	 */
	public List> sort(Collection unSorted) {
		int size = unSorted.size();
		//copy the list so can return a new sorted collection
		List> sortedObjects = new ArrayList<>(size);
		unSorted.forEach(k -> sortedObjects.add(new Pair<>(k, this.toString.apply(k))));
		Collections.sort(sortedObjects);
		return sortedObjects;
	}
}