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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) 2002 Palo Alto Research Center, Incorporated (PARC).
 * All rights reserved.
 * This program and the accompanying materials are made available
 * under the terms of the Eclipse Public License v 2.0
 * which accompanies this distribution and is available at
 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.txt
 *
 * Contributors:
 *     Xerox/PARC     initial implementation
 * ******************************************************************/

package org.aspectj.util;

import java.io.DataOutputStream;
import java.io.IOException;

public class TypeSafeEnum {
	private final byte key;
	private final String name;

	public TypeSafeEnum(String name, int key) {
		this.name = name;
		if (key > Byte.MAX_VALUE || key < Byte.MIN_VALUE) {
			throw new IllegalArgumentException("key doesn't fit into a byte: " + key);
		}
		this.key = (byte) key;
	}

	public String toString() {
		return name;
	}

	public String getName() {
		return name;
	}

	public byte getKey() {
		return key;
	}

	public void write(DataOutputStream s) throws IOException {
		s.writeByte(key);
	}
	@Override
	public int hashCode() {
		return name.hashCode()*37+key;
	}

	@Override
	public boolean equals(Object o) {
		return (o instanceof TypeSafeEnum) &&
			((TypeSafeEnum)o).key == key &&
			((TypeSafeEnum)o).name.equals(name);
	}
}