MethodExitEvent.java

/*
 * Copyright 1998-2004 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.jdi.event;

import com.sun.jdi.*;

/**
 * Notification of a method return in the target VM. This event
 * is generated after all code in the method has executed, but the
 * location of this event is the last executed location in the method.
 * Method exit events are generated for both native and non-native
 * methods. Method exit events are not generated if the method terminates
 * with a thrown exception.
 *
 * @see EventQueue
 *
 * @author Robert Field
 * @since  1.3
 */
public interface MethodExitEvent extends LocatableEvent {

    /**
     * Returns the method that was exited.
     *
     * @return a {@link Method} which mirrors the method that was exited.
     * @throws ObjectCollectedException may be thrown if class
     * has been garbage collected.
     */
    public Method method();

    /**
     * Returns the value that the method will return.
     *
     * Not all target virtual machines support this operation.
     * Use
     * {@link VirtualMachine#canGetMethodReturnValues() canGetMethodReturnValues()}
     * to determine if this operation is supported.
     *
     * @return a {@link Value} which mirrors the value to be returned.
     *
     * @throws java.lang.UnsupportedOperationException if
     * the target virtual machine does not support this
     * operation - see
     * {@link VirtualMachine#canGetMethodReturnValues() canGetMethodReturnValues()}
     *
     * @since 1.6
     */

    public Value returnValue();
}