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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2012 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
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 * GPL Classpath Exception:
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 *
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 * enclosed by brackets [] replaced by your own identifying information:
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 */

package org.glassfish.ejb.deployment.node;

import com.sun.enterprise.deployment.EjbDescriptor;
import com.sun.enterprise.deployment.MethodDescriptor;
import com.sun.enterprise.deployment.MethodPermission;
import com.sun.enterprise.deployment.MethodPermissionDescriptor;
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.TagNames;

import org.glassfish.ejb.deployment.EjbTagNames;
import org.glassfish.security.common.Role;
import org.w3c.dom.Node;
import org.xml.sax.Attributes;

/**
 * This class handles all the method-permission xml tag
 * information 
 *
 * @author  Jerome Dochez
 * @version 
 */
public class MethodPermissionNode extends DeploymentDescriptorNode {

    private MethodPermissionDescriptor descriptor;

    /** Creates new MethodPermissionNode */
    public MethodPermissionNode() {       
        super();
        registerElementHandler(new XMLElement(EjbTagNames.METHOD), 
                                                            MethodNode.class, "addMethod");                 
    }

    @Override
    public MethodPermissionDescriptor getDescriptor() {
       if (descriptor==null) {
            descriptor = new MethodPermissionDescriptor();
        }
        return descriptor;
    }

    /**
     * SAX Parser API implementation, we don't really care for now.
     */
    @Override
    public void startElement(XMLElement element, Attributes attributes) {
        if (EjbTagNames.UNCHECKED.equals(element.getQName())) {
            descriptor.addMethodPermission(MethodPermission.getUncheckedMethodPermission());
        } else 
            super.startElement(element, attributes);
    }
        
    /**
     * receives notification of the value for a particular tag
     * 
     * @param element the xml element
     * @param value it's associated value
     */    
    @Override
    public void setElementValue(XMLElement element, String value) {
        if (TagNames.ROLE_NAME.equals(element.getQName())) {
            Role role = new Role(value);
            descriptor.addMethodPermission(new MethodPermission(role));
        } else {
            super.setElementValue(element, value);
        }
    }

    /**
     * write the descriptor class to a DOM tree and return it
     *
     * @param parent node in 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, MethodPermissionDescriptor descriptor, 
                EjbDescriptor ejb) {
        Node subNode = super.writeDescriptor(parent, nodeName, descriptor);        
        return writeDescriptorInNode(subNode, descriptor, ejb);
    }

    /**
     * Write the descriptor in a DOM tree which root element is provided
     * 
     * @param subNode the root element for the DOM fragment
     * @param descriptor the method permisison descriptor
     * @param ejb the ejb descriptor the above method permission belongs to
     */
    public Node writeDescriptorInNode(Node subNode, MethodPermissionDescriptor descriptor, 
                EjbDescriptor ejb) {        
                    
        writeLocalizedDescriptions(subNode, descriptor);
        
        MethodPermission[] mps = descriptor.getMethodPermissions();
        if (mps.length==0)
            return null;
        
        if (!mps[0].isExcluded()) {
            if (mps[0].isUnchecked()) {
                appendChild(subNode, EjbTagNames.UNCHECKED);
            } else {
                for (int i=0;i