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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, 2013 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;

import java.util.Enumeration;

/**
 *	The LRUCacheEnumerator returns its elements in
 *	the order they are found in the LRUCache, with the
 *	most recent elements first.
 *
 *	Once the enumerator is created, elements which are later added
 *	to the cache are not returned by the enumerator.  However,
 *	elements returned from the enumerator could have been closed
 *	by the cache.
 */
public class LRUCacheEnumerator implements Enumeration {
	/**
	 *	Current element;
	 */
	protected LRUEnumeratorElement elementQueue;

	public static class LRUEnumeratorElement {
		/**
		 *	Value returned by nextElement();
		 */
		public V value;

		/**
		 *	Next element
		 */
		public LRUEnumeratorElement next;

		/**
		 * Constructor
		 */
		public LRUEnumeratorElement(V value) {
			this.value = value;
		}
	}
/**
 *	Creates a CacheEnumerator on the list of LRUEnumeratorElements.
 */
public LRUCacheEnumerator(LRUEnumeratorElement firstElement) {
	this.elementQueue = firstElement;
}
/**
 * Returns true if more elements exist.
 */
@Override
public boolean hasMoreElements() {
	return this.elementQueue != null;
}
/**
 * Returns the next element.
 */
@Override
public V nextElement() {
	V temp = this.elementQueue.value;
	this.elementQueue = this.elementQueue.next;
	return temp;
}
}