org.aspectj.bridge.AbortException Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of aspectjmatcher Show documentation
The AspectJ matcher can be used for matching pointcuts independently of any AspectJ compilation or weaving steps. Most notably, this can be used by frameworks such as Spring AOP which utilise the @AspectJ pointcut syntax but implement aspect weaving in a way independent of AspectJ, e.g. using dynamic proxies.
There is a newer version: 1.9.22.1
Show newest version
/* *******************************************************************
 * 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.PrintStream;
import java.io.PrintWriter;
import java.util.ArrayList;

/**
 * Signal that a process was aborted before completion. This may contain a structured IMessage which indicates why the process was
 * aborted (e.g., the underlying exception). For processes using try/catch to complete a method abruptly but complete the process
 * normally (e.g., a test failure causes the test to abort but the reporting and testing continues normally), use the static methods
 * to borrow and return a "porter" to avoid the expense of constructing a stack trace each time. A porter stack trace is invalid,
 * and it should only be used to convey a message. E.g., to print the stack of the AbortException and any contained message:
 *
 *  * catch (AbortException ae) {
 *     IMessage m = ae.getMessage();
 *     if (!ae.isPorter()) ae.printStackTrace(System.err);
 *     Throwable thrown = ae.getThrown();
 *     if (null != thrown) thrown.printStackTrace(System.err);
 * }
 * 
 *
 * @author PARC
 * @author Andy Clement
 */
public class AbortException extends RuntimeException { // XXX move porters out, handle proxy better

	private static final long serialVersionUID = -7211791639898586417L;

	private boolean isSilent = false;

	/** used when message text is null */
	public static final String NO_MESSAGE_TEXT = "AbortException (no message)";

	private static final ArrayList porters = new ArrayList<>();

	/**
	 * Get a porter exception from the pool. Porter exceptions do not have valid stack traces. They are used only to avoid
	 * generating stack traces when using throw/catch to abruptly complete but continue.
	 */
	public static AbortException borrowPorter(IMessage message) {
		AbortException result;
		synchronized (porters) {
			if (porters.size() > 0) {
				result = porters.get(0);
			} else {
				result = new AbortException();
				result.setIsSilent(false);
			}
		}
		result.setIMessage(message);
		result.isPorter = true;
		return result;
	}

	/**
	 * Return (or add) a porter exception to the pool.
	 */
	public static void returnPorter(AbortException porter) {
		synchronized (porters) {
			if (porters.contains(porter)) {
				throw new IllegalStateException("already have " + porter);
			} else {
				porters.add(porter);
			}
		}
	}

	/** @return NO_MESSAGE_TEXT or message.getMessage() if not null */
	private static String extractMessage(IMessage message) {
		if (null == message) {
			return NO_MESSAGE_TEXT;
		} else {
			String m = message.getMessage();
			if (null == m) {
				return NO_MESSAGE_TEXT;
			} else {
				return m;
			}
		}
	}

	/** structured message abort */
	protected IMessage message;

	/** true if this is a porter exception - only used to hold message */
	protected boolean isPorter;

	/** abort with default String message */
	public AbortException() {
		this("ABORT");
		isSilent = true;
	}

	/** abort with message */
	public AbortException(String s) {
		super(null != s ? s : NO_MESSAGE_TEXT);
		this.message = null;
	}

	/** abort with structured message */
	public AbortException(IMessage message) {
		super(extractMessage(message));
		this.message = message;
	}

	/** @return IMessage structured message, if set */
	public IMessage getIMessage() {
		return message;
	}

	/**
	 * The stack trace of a porter is invalid; it is only used to carry a message (which may itself have a wrapped exception).
	 *
	 * @return true if this exception is only to carry exception
	 */
	public boolean isPorter() {
		return isPorter;
	}

	/** @return Throwable at bottom of IMessage chain, if any */
	public Throwable getThrown() {
		Throwable result = null;
		IMessage m = getIMessage();
		if (null != m) {
			result = m.getThrown();
			if (result instanceof AbortException) {
				return ((AbortException) result).getThrown();
			}
		}
		return result;
	}

	private void setIMessage(IMessage message) {
		this.message = message;
	}

	// ----------- proxy attempts
	/**
	 * Get message for this AbortException, either associated explicitly as message or implicitly as IMessage message or its thrown
	 * message.
	 *
	 * @see java.lang.Throwable#getMessage()
	 */
	public String getMessage() {
		String message = super.getMessage();
		if ((null == message) || (NO_MESSAGE_TEXT == message)) {
			IMessage m = getIMessage();
			if (null != m) {
				message = m.getMessage();
				if (null == message) {
					Throwable thrown = m.getThrown();
					if (null != thrown) {
						message = thrown.getMessage();
					}
				}
			}
			if (null == message) {
				message = NO_MESSAGE_TEXT; // better than nothing
			}
		}
		return message;
	}

	/**
	 * @see java.lang.Throwable#printStackTrace()
	 */
	public void printStackTrace() {
		printStackTrace(System.out);
	}

	/**
	 * Print the stack trace of any enclosed thrown or this otherwise.
	 *
	 * @see java.lang.Throwable#printStackTrace(PrintStream)
	 */
	public void printStackTrace(PrintStream s) {
		IMessage m = getIMessage();
		Throwable thrown = (null == m ? null : m.getThrown());
		if (!isPorter() || (null == thrown)) {
			s.println("Message: " + m);
			super.printStackTrace(s);
		} else {
			thrown.printStackTrace(s);
		}
	}

	/**
	 * Print the stack trace of any enclosed thrown or this otherwise.
	 *
	 * @see java.lang.Throwable#printStackTrace(PrintWriter)
	 */
	public void printStackTrace(PrintWriter s) {
		IMessage m = getIMessage();
		Throwable thrown = (null == m ? null : m.getThrown());
		if (null == thrown) { // Always print
			if (isPorter()) {
				s.println("(Warning porter AbortException without thrown)");
			}
			s.println("Message: " + m);
			super.printStackTrace(s);
		} else {
			thrown.printStackTrace(s);
		}
	}

	public boolean isSilent() {
		return isSilent;
	}

	public void setIsSilent(boolean isSilent) {
		this.isSilent = isSilent;
	}

}