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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, 2015 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.eclipse.core.runtime;

import java.io.PrintStream;
import java.io.PrintWriter;
import org.eclipse.core.internal.runtime.PrintStackUtil;

/**
 * A checked exception representing a failure.
 * 
 * Core exceptions contain a status object describing the cause of the exception.
 * 

 * This class can be used without OSGi running.
 * 
 * @see IStatus
 */
public class CoreException extends Exception {

	/**
	 * All serializable objects should have a stable serialVersionUID
	 */
	private static final long serialVersionUID = 1L;

	/** Status object. */
	private final IStatus status;

	/**
	 * Creates a new exception with the given status object.  The message
	 * of the given status is used as the exception message.
	 *
	 * @param status the status object to be associated with this exception
	 */
	public CoreException(IStatus status) {
		super(status.getMessage());
		this.status = status;
	}

	/**
	 * Returns the cause of this exception, or null if none.
	 * 
	 * @return the cause for this exception
	 * @since 3.4
	 */
	@Override
	public Throwable getCause() {
		return status.getException();
	}

	/**
	 * Returns the status object for this exception.
	 * 
	 *   IMPORTANT:

	 *   The result must NOT be used for logging, error reporting, or as a method 
	 *   return value, since that code pattern hides the original stack trace. Instead, 
	 *   create a new {@link Status} with your plug-in ID and this 
	 *   CoreException, and use that new status for error reporting
	 *   or as a method return value. For example, instead of:
	 * 
	 *   	 *      yourPlugin.getLog().log(exception.getStatus());
	 *   
	 *   Use:
	 *   	 *      IStatus result = new Status(exception.getStatus().getSeverity(), pluginId, message, exception);
	 *      yourPlugin.getLog().log(result);
	 *   
	 *
	 * @return a status object
	 */
	public final IStatus getStatus() {
		return status;
	}

	/**
	 * Prints a stack trace out for the exception, and
	 * any nested exception that it may have embedded in
	 * its Status object.
	 */
	@Override
	public void printStackTrace() {
		printStackTrace(System.err);
	}

	/**
	 * Prints a stack trace out for the exception, and
	 * any nested exception that it may have embedded in
	 * its Status object.
	 * 
	 * @param output the stream to write to
	 */
	@Override
	public void printStackTrace(PrintStream output) {
		synchronized (output) {
			super.printStackTrace(output);
			PrintStackUtil.printChildren(status, output);
		}
	}

	/**
	 * Prints a stack trace out for the exception, and
	 * any nested exception that it may have embedded in
	 * its Status object.
	 * 
	 * @param output the stream to write to
	 */
	@Override
	public void printStackTrace(PrintWriter output) {
		synchronized (output) {
			super.printStackTrace(output);
			PrintStackUtil.printChildren(status, output);
		}
	}
}