securitytokenmessageserializer.java

oasis发布的web services security规范中的ws-trust规范的java实现

package edu.virginia.cs.wst.serialization;

import java.io.IOException;

import javax.xml.namespace.QName;

import org.apache.axis.Constants;
import org.apache.axis.encoding.SerializationContext;
import org.apache.axis.encoding.Serializer;
import org.apache.axis.wsdl.fromJava.Types;
import org.w3c.dom.Attr;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.Attributes;
import org.xml.sax.helpers.AttributesImpl;

import edu.virginia.cs.wst.SecurityTokenMessage;
import edu.virginia.cs.wst.TrustConstants;
import edu.virginia.cs.wst.exception.TrustException;

/**
 * @author ddelvecc
 *
 * For serializing any SecurityTokenMessage objects into their XML representation.
 */
public abstract class SecurityTokenMessageSerializer implements Serializer {
	
	/**
	 * Serialize an element named name, with the indicated attributes
	 * and value.
	 * @param name is the element name
	 * @param attributes are the attributes...serialize is free to add more.
	 * @param value is the value
	 * @param context is the SerializationContext
	 */
	public void serialize(QName name, Attributes attributes, Object value, SerializationContext context) throws IOException {
		if(!(value instanceof SecurityTokenMessage))
			throw new IOException("Can't serialize a " + value.getClass().getName() + " with a SecurityTokenMessageSerializer.");
		
		context.setPretty(false);
		
		SecurityTokenMessage tokenRequest = (SecurityTokenMessage) value;
		try {

			Element element = tokenRequest.getElement();
			if(name.equals(new QName(element.getNamespaceURI(), element.getLocalName()))) {
				AttributesImpl attrs = null;
				if(attributes != null)
					attrs = new AttributesImpl(attributes);
				else
					attrs = new AttributesImpl();
				Attr ctxt = element.getAttributeNodeNS(TrustConstants.WST_NS, TrustConstants.CONTEXT_ATTR);
				if(ctxt != null)
					attrs.addAttribute(ctxt.getNamespaceURI(), ctxt.getLocalName(), ctxt.getName(), "CDATA", ctxt.getValue());

				context.startElement(name, attrs);
				NodeList children = element.getChildNodes();
				if(children != null) {
					for(int i = 0; i < children.getLength(); i++)
						context.writeDOMElement((Element) children.item(i));
				}
			}
			else {
				context.startElement(name, attributes);
				context.writeDOMElement(element);
			}
			
			context.endElement();
		}
		catch (TrustException e) {
			throw new IOException("TrustException during SecurityTokenMessage serialization: " + e.getMessage());
		}
		catch (Exception e) {
			throw new IOException("Exception during SecurityTokenMessage serialization: " + e.getMessage());
		}
	}

	public Element writeSchema(Class javaType, Types types) throws Exception {
		return null;
	}

	public String getMechanismType() {
		return Constants.AXIS_SAX;
	}

}