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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
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 * 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
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package com.sun.enterprise.deployment.node.ejb;

import com.sun.enterprise.deployment.ConcurrentMethodDescriptor;
import com.sun.enterprise.deployment.Descriptor;
import com.sun.enterprise.deployment.TimeoutValueDescriptor;

import com.sun.enterprise.deployment.node.DeploymentDescriptorNode;
import com.sun.enterprise.deployment.node.MethodNode;
import com.sun.enterprise.deployment.node.XMLElement;
import com.sun.enterprise.deployment.xml.EjbTagNames;
import org.w3c.dom.Node;

public class ConcurrentMethodNode extends DeploymentDescriptorNode {

    ConcurrentMethodDescriptor descriptor = null;

    private static final String READ_LOCK = "Read";
    private static final String WRITE_LOCK = "Write";

    public ConcurrentMethodNode() {
        super();

        registerElementHandler(new XMLElement(EjbTagNames.METHOD), MethodNode.class,
                "setConcurrentMethod");
        registerElementHandler(new XMLElement(EjbTagNames.CONCURRENT_ACCESS_TIMEOUT),
                TimeoutValueNode.class, "setAccessTimeout");

    }

    /**
     * @return the Descriptor subclass that was populated  by reading
     * the source XML file
     */
    public Object getDescriptor() {
        if (descriptor == null) {
            descriptor = (ConcurrentMethodDescriptor) new ConcurrentMethodDescriptor();
        }
        return descriptor;
    }

    /**
     * receives notiification of the value for a particular tag
     *
     * @param element the xml element
     * @param value it's associated value
     */
    public void setElementValue(XMLElement element, String value) {

        if (EjbTagNames.CONCURRENT_LOCK.equals(element.getQName())) {
            descriptor.setWriteLock(value.equals(WRITE_LOCK));
        } else {
            super.setElementValue(element, value);
        }
    }
        
    /**
     * write the descriptor class to a DOM tree and return it
     *
     * @param parent node for the DOM tree
     * @param node name for the root element of this xml fragment
     * @param the descriptor to write
     * @return the DOM tree top node
     */
    public Node writeDescriptor(Node parent, String nodeName, Descriptor descriptor) {
        if (! (descriptor instanceof ConcurrentMethodDescriptor)) {
            throw new IllegalArgumentException(getClass()
                    + " cannot handles descriptors of type " + descriptor.getClass());
        }

        ConcurrentMethodDescriptor desc = (ConcurrentMethodDescriptor) descriptor;

        Node concurrentNode = super.writeDescriptor(parent, nodeName, descriptor);

        MethodNode methodNode = new MethodNode();

        methodNode.writeJavaMethodDescriptor(concurrentNode, EjbTagNames.METHOD,
                desc.getConcurrentMethod());

        if( desc.hasLockMetadata() ) {
            String lockType = desc.isWriteLocked() ? "Write" : "Read";
            appendTextChild(concurrentNode, EjbTagNames.CONCURRENT_LOCK, lockType);
        }

        if( desc.hasAccessTimeout() ) {
            TimeoutValueNode timeoutValueNode = new TimeoutValueNode();
            TimeoutValueDescriptor timeoutDesc = new TimeoutValueDescriptor();
            timeoutDesc.setValue(desc.getAccessTimeoutValue());
            timeoutDesc.setUnit(desc.getAccessTimeoutUnit());
            timeoutValueNode.writeDescriptor(concurrentNode, EjbTagNames.CONCURRENT_ACCESS_TIMEOUT,
                timeoutDesc);
        }

        return concurrentNode;
     }

}