ExceptionEventSet.java

/*
 * Copyright 1999 Sun Microsystems, Inc.  All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Sun designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 */

package com.sun.tools.example.debug.event;

import com.sun.jdi.*;
import com.sun.jdi.event.*;

public class ExceptionEventSet extends LocatableEventSet {

    ExceptionEventSet(EventSet jdiEventSet) {
        super(jdiEventSet);
    }

    /**
     * Gets the thrown exception object. The exception object is
     * an instance of java.lang.Throwable or a subclass in the
     * target VM.
     *
     * @return an {@link ObjectReference} which mirrors the thrown object in
     * the target VM.
     */
    public ObjectReference getException() {
        return ((ExceptionEvent)oneEvent).exception();
    }

    /**
     * Gets the location where the exception will be caught. An exception
     * is considered to be caught if, at the point of the throw, the
     * current location is dynamically enclosed in a try statement that
     * handles the exception. (See the JVM specification for details).
     * If there is such a try statement, the catch location is the
     * first code index of the appropriate catch clause.
     * <p>
     * If there are native methods in the call stack at the time of the
     * exception, there are important restrictions to note about the
     * returned catch location. In such cases,
     * it is not possible to predict whether an exception will be handled
     * by some native method on the call stack.
     * Thus, it is possible that exceptions considered uncaught
     * here will, in fact, be handled by a native method and not cause
     * termination of the target VM. Also, it cannot be assumed that the
     * catch location returned here will ever be reached by the throwing
     * thread. If there is
     * a native frame between the current location and the catch location,
     * the exception might be handled and cleared in that native method
     * instead.
     *
     * @return the {@link Location} where the exception will be caught or null if
     * the exception is uncaught.
     */
    public Location getCatchLocation() {
        return ((ExceptionEvent)oneEvent).catchLocation();
    }

    public void notify(JDIListener listener) {
        listener.exception(this);
    }
}