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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.hk2.xml.internal;

import org.glassfish.hk2.api.MultiException;
import org.glassfish.hk2.xml.api.XmlHandleTransaction;
import org.glassfish.hk2.xml.api.XmlRootHandle;

/**
 * @author jwells
 *
 */
public class XmlHandleTransactionImpl implements XmlHandleTransaction {
    private final XmlRootHandle root;
    private final DynamicChangeInfo changeInfo;
    
    public XmlHandleTransactionImpl(XmlRootHandle root, DynamicChangeInfo changeInfo) {
        this.root = root;
        this.changeInfo = changeInfo;
        
        changeInfo.getWriteLock().lock();
        changeInfo.startOrContinueChange(null);
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.xml.api.XmlHandleTransaction#getRootHandle()
     */
    @Override
    public XmlRootHandle getRootHandle() {
        return root;
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.xml.api.XmlHandleTransaction#commit()
     */
    @Override
    public void commit() throws MultiException {
        try {
            changeInfo.endOrDeferChange(true);
        }
        finally {
            changeInfo.getWriteLock().unlock();
        }
    }

    /* (non-Javadoc)
     * @see org.glassfish.hk2.xml.api.XmlHandleTransaction#abandon()
     */
    @Override
    public void abandon() {
        try {
            changeInfo.endOrDeferChange(false);
        }
        finally {
            changeInfo.getWriteLock().unlock();
        }
    }

    @Override
    public String toString() {
        return "XmlHandleTransactionImpl(" + root + "," + System.identityHashCode(this) + ")";
    }
}