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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) 1999-2001 Xerox Corporation,
 *               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.bridge;

import java.io.PrintWriter;

/**
 * An IMessageHandler implementation that writes all to a PrintWriter.
 * Clients may set this up to throw AbortException for FAIL or ERROR messages.
 * Subclasses may control whether messages are printed and how they
 * are rendered by overriding render(IMessage).
 */
public class MessageWriter implements IMessageHandler {

    protected PrintWriter writer;
    protected boolean abortOnFailure;
    public MessageWriter(PrintWriter writer, boolean abortOnFailure) {
        this.writer = (null != writer ? writer : new PrintWriter(System.out));
        this.abortOnFailure = abortOnFailure;
    }

    /**
     * Handle message by printing and
     * (if abortOnFailure) throwing an AbortException if
     * the messages is a failure or an abort (but not for errors).
	 * @see org.aspectj.bridge.IMessageHandler#handleMessage(IMessage)
	 */
	public boolean handleMessage(IMessage message) throws AbortException {
        if ((null != message) && !isIgnoring(message.getKind())) {
            String result = render(message);
            if (null != result) {
                writer.println(result);
                writer.flush();
                if (abortOnFailure
                    && (message.isFailed() || message.isAbort())) {
                    throw new AbortException(message);
                }
            }
        }
		return true;
	}

    /**
	 * @see org.aspectj.bridge.IMessageHandler#isIgnoring(org.aspectj.bridge.IMessage.Kind)
	 */
	public boolean isIgnoring(IMessage.Kind kind) {
        // XXX share MessageHandler implementation in superclass
		return false;
	}

    /**
     * No-op
     * @see org.aspectj.bridge.IMessageHandler#isIgnoring(org.aspectj.bridge.IMessage.Kind)
     * @param kind
     */
    public void dontIgnore(IMessage.Kind kind) {

    }

    /**
     * No-op
     * @see org.aspectj.bridge.IMessageHandler#ignore(org.aspectj.bridge.IMessage.Kind)
     * @param kind
     */
	public void ignore(IMessage.Kind kind) {
	}

    /** @return null to not print, or message rendering (including newlines) */
    protected String render(IMessage message) {
        return message.toString();
    }

}