edu.umn.msi.tropix.common.xml.ObjectDeserializationContext.java Source code

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Here is the source code for edu.umn.msi.tropix.common.xml.ObjectDeserializationContext.java

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/*
 * Portions of this file Copyright 1999-2005 University of Chicago
 * Portions of this file Copyright 1999-2005 The University of Southern California.
 *
 * This file or a portion of this file is licensed under the
 * terms of the Globus Toolkit Public License, found at
 * http://www.globus.org/toolkit/download/license.html.
 * If you redistribute this file, with or without
 * modifications, you must include this notice in the file.
 */
package edu.umn.msi.tropix.common.xml;

import java.io.StringReader;

import javax.xml.namespace.QName;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.axis.AxisEngine;
import org.apache.axis.Constants;
import org.apache.axis.MessageContext;
import org.apache.axis.client.AxisClient;
import org.apache.axis.encoding.DeserializationContext;
import org.apache.axis.encoding.Deserializer;
import org.apache.axis.message.EnvelopeHandler;
import org.apache.axis.message.MessageElement;
import org.apache.axis.message.SOAPHandler;
import org.apache.axis.utils.XMLUtils;

import org.w3c.dom.Element;
import org.xml.sax.InputSource;
import org.xml.sax.Locator;

class ObjectDeserializationContext extends DeserializationContext {

    private static final Log LOGGER = LogFactory.getLog(ObjectDeserializationContext.class.getName());

    private Deserializer topDeserializer = null;

    public ObjectDeserializationContext(final MessageElement element) throws Exception {
        this(element, null);
    }

    public ObjectDeserializationContext(final MessageElement element, final Class javaClass) throws Exception {
        super(getContext(), new SOAPHandler());

        init(element.getType(), javaClass);

        String inputString = element.toString();
        LOGGER.debug(inputString);
        inputSource = new InputSource(new StringReader(inputString));
    }

    public ObjectDeserializationContext(final Element element) throws Exception {
        this(element, null);
    }

    public ObjectDeserializationContext(final Element element, final Class javaClass) throws Exception {
        super(getContext(), new SOAPHandler());

        String typeAttr = element.getAttributeNS(Constants.URI_DEFAULT_SCHEMA_XSI, "type");

        QName type = null;

        if (typeAttr != null && typeAttr.length() > 0) {
            type = XMLUtils.getQNameFromString(typeAttr, element);
        }

        init(type, javaClass);

        String inputString = XMLUtils.ElementToString(element);
        LOGGER.debug(inputString);
        inputSource = new InputSource(new StringReader(inputString));
    }

    public ObjectDeserializationContext(final InputSource input, final Class javaClass) throws Exception {
        super(getContext(), new SOAPHandler());
        init(null, javaClass);
        this.inputSource = input;
    }

    private void setDeserializer(final QName type, final Class javaClass) throws Exception {
        if (type == null && javaClass == null) {
            throw new Exception("typeOrClassRequired");
        }

        if (type != null) {
            // Use the xmlType to get the deserializer.
            this.topDeserializer = getDeserializerForType(type);
        } else {
            QName defaultXMLType = getTypeMapping().getTypeQName(javaClass);
            this.topDeserializer = getDeserializer(javaClass, defaultXMLType);
        }

        if (this.topDeserializer == null) {
            this.topDeserializer = getDeserializerForClass(javaClass);
        }
    }

    private void init(final QName type, final Class javaClass) throws Exception {
        msgContext.setEncodingStyle("");
        popElementHandler();

        setDeserializer(type, javaClass);

        if (topDeserializer == null) {
            String arg = (type == null) ? javaClass.getName() : type.toString();
            throw new Exception("noDeserializer");
        }

        pushElementHandler(new EnvelopeHandler((SOAPHandler) this.topDeserializer));
    }

    // overwrites the superclass method
    public void setDocumentLocator(final Locator locator) {
    }

    public Object getValue() {
        return (this.topDeserializer == null) ? null : this.topDeserializer.getValue();
    }

    public MessageElement getMessageElement() {
        if (this.topDeserializer == null || !(this.topDeserializer instanceof SOAPHandler)) {
            return null;
        }
        return ((SOAPHandler) this.topDeserializer).myElement;
    }

    public QName getQName() {
        MessageElement element = getMessageElement();
        return (element == null) ? null : element.getQName();
    }

    /**
     * Gets MessageContext associated with the current thread. If
     * MessageContext is not associated with the current thread a new
     * one is created, initialized with client AxisEngine.
     */
    public static MessageContext getContext() {
        MessageContext ctx = MessageContext.getCurrentContext();
        if (ctx == null) {
            ctx = new MessageContext(getClientEngine());
            ctx.setEncodingStyle("");
            ctx.setProperty(AxisClient.PROP_DOMULTIREFS, Boolean.FALSE);
        }
        return ctx;
    }

    private static AxisEngine axisClientEngine = null;

    /**
     * Get the default Axis client engine.
     */
    public static synchronized AxisEngine getClientEngine() {
        if (axisClientEngine == null) {
            axisClientEngine = new AxisClient();
        }
        return axisClientEngine;
    }

}