ojluni/src/main/java/com/sun/tools/example/debug/tty/ModificationWatchpointSpec.java

/*
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 * 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle 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.
 *
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/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */


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

import com.sun.jdi.*;
import com.sun.jdi.request.EventRequestManager;
import com.sun.jdi.request.EventRequest;

class ModificationWatchpointSpec extends WatchpointSpec {
    ModificationWatchpointSpec(ReferenceTypeSpec refSpec, String fieldId)
                                  throws MalformedMemberNameException {
        super(refSpec, fieldId);
    }

    /**
     * The 'refType' is known to match, return the EventRequest.
     */
    @Override
    EventRequest resolveEventRequest(ReferenceType refType)
                                      throws NoSuchFieldException {
        Field field = refType.fieldByName(fieldId);
        EventRequestManager em = refType.virtualMachine().eventRequestManager();
        EventRequest wp = em.createModificationWatchpointRequest(field);
        wp.setSuspendPolicy(suspendPolicy);
        wp.enable();
        return wp;
    }

    @Override
    public String toString() {
        return MessageOutput.format("watch modification of",
                                    new Object [] {refSpec.toString(),
                                                   fieldId});
    }
}