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 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
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 * 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
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/*
 * ServletNode.java
 *
 * Created on March 7, 2002, 2:30 PM
 */

package com.sun.enterprise.deployment.node.runtime;

import org.w3c.dom.Node;

import com.sun.enterprise.deployment.WebBundleDescriptor;
import com.sun.enterprise.deployment.WebComponentDescriptor;
import com.sun.enterprise.deployment.WebServicesDescriptor;
import com.sun.enterprise.deployment.node.DeploymentDescriptorNode;
import com.sun.enterprise.deployment.node.XMLElement;
import com.sun.enterprise.deployment.node.runtime.web.WebBundleRuntimeNode;
import com.sun.enterprise.deployment.xml.RuntimeTagNames;
import com.sun.enterprise.deployment.xml.WebServicesTagNames;

/**
 * This node is handling all runtime deployment descriptors 
 * relative to servlets
 *
 * @author  Jerome Dochez
 * @version 
 */
public class ServletNode extends DeploymentDescriptorNode {

    private WebComponentDescriptor descriptor;

    public ServletNode() {
        registerElementHandler(new XMLElement
            (WebServicesTagNames.WEB_SERVICE_ENDPOINT), 
                               WebServiceEndpointRuntimeNode.class);
    }

    public Object getDescriptor() {
        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 (RuntimeTagNames.SERVLET_NAME.equals(element.getQName())) {
            Object parentDesc = ((WebBundleRuntimeNode) getParentNode()).getWebBundleDescriptor();
            if (parentDesc instanceof WebBundleDescriptor) {
                descriptor = ((WebBundleDescriptor) parentDesc).getWebComponentByCanonicalName(value);
            }
        } else if (RuntimeTagNames.PRINCIPAL_NAME.equals(element.getQName())) {
            if (descriptor!=null && descriptor.getRunAsIdentity()!=null) {
                descriptor.getRunAsIdentity().setPrincipal(value);
            }
        } 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 
     * @param the descriptor to write
     * @return the DOM tree top node
     */    
    public Node writeDescriptor(Node parent, String nodeName, WebComponentDescriptor descriptor) {        
        WebServicesDescriptor webServices = 
            descriptor.getWebBundleDescriptor().getWebServices();

        // only write servlet runtime elements if there is a runas identity
        // or the servlet is exposed as a web service
        if ( (descriptor.getRunAsIdentity() != null) ||
             webServices.hasEndpointsImplementedBy(descriptor) ) {
            Node servletNode =  appendChild(parent, nodeName);
            appendTextChild(servletNode, RuntimeTagNames.SERVLET_NAME, descriptor.getCanonicalName());

            if( descriptor.getRunAsIdentity() != null ) {
                appendTextChild(servletNode, RuntimeTagNames.PRINCIPAL_NAME, 
                                descriptor.getRunAsIdentity().getPrincipal());
            }

            WebServiceEndpointRuntimeNode wsRuntime = 
                new WebServiceEndpointRuntimeNode();
            wsRuntime.writeWebServiceEndpointInfo(servletNode, descriptor);

            return servletNode;
        }
        return null;
    }
}