org.apache.juddi.jaxb.JAXBMarshaller.java Source code

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/*
 * Copyright 2001-2008 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package org.apache.juddi.jaxb;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.w3c.dom.Element;

/**
 * @author <a href="mailto:jfaath@apache.org">Jeff Faath</a>
 */
public class JAXBMarshaller {
    private static Log logger = LogFactory.getLog(JAXBMarshaller.class);

    public static final String PACKAGE_UDDIAPI = "org.uddi.api_v3";
    public static final String PACKAGE_SUBSCRIPTION = "org.uddi.sub_v3";
    public static final String PACKAGE_SUBSCR_RES = "org.uddi.subr_v3";
    public static final String PACKAGE_JUDDIAPI = "org.apache.juddi.api_v3";
    public static final String PACKAGE_JUDDI = "org.apache.juddi";
    private static final Map<String, JAXBContext> JAXBContexts = new HashMap<String, JAXBContext>();

    private static JAXBContext getContext(String packageName) {
        if (!JAXBContexts.containsKey(packageName)) {
            try {
                JAXBContexts.put(packageName, JAXBContext.newInstance(packageName));
            } catch (JAXBException e) {
                logger.error("Initialization of JAXBMarshaller failed:" + e, e);
                throw new ExceptionInInitializerError(e);
            }
        }

        return JAXBContexts.get(packageName);
    }

    @SuppressWarnings("rawtypes")
    public static Object unmarshallFromInputStream(InputStream inputStream, String thePackage)
            throws JAXBException {
        Object obj = null;
        if (inputStream != null) {
            JAXBContext jc = getContext(thePackage);
            Unmarshaller unmarshaller = jc.createUnmarshaller();
            obj = ((JAXBElement) unmarshaller.unmarshal(inputStream)).getValue();
        } else
            logger.error("A null input stream was provided");

        return obj;

    }

    public static Object unmarshallFromFileResource(String fileName, String thePackage)
            throws JAXBException, IOException {
        Object obj = null;
        URL url = Thread.currentThread().getContextClassLoader().getResource(fileName);
        if (url == null) {
            logger.error("Could not find resource: " + fileName);
        } else {
            InputStream resourceStream = url.openStream();

            obj = unmarshallFromInputStream(resourceStream, thePackage);
        }
        return obj;
    }

    public static Object unmarshallFromString(String rawObject, String thePackage) throws JAXBException {
        Object obj = null;
        if (rawObject != null && rawObject.length() > 0) {
            ByteArrayInputStream bais = new ByteArrayInputStream(rawObject.getBytes());
            obj = unmarshallFromInputStream(bais, thePackage);
        } else
            logger.error("The raw object provided is null or empty");
        return obj;
    }

    public static String marshallToString(Object object, String thePackage) {
        String rawObject = null;

        try {
            JAXBContext jc = getContext(thePackage);
            Marshaller marshaller = jc.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.FALSE);
            marshaller.setProperty(Marshaller.JAXB_FRAGMENT, Boolean.TRUE);
            marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            marshaller.marshal(object, baos);
            rawObject = baos.toString();
        } catch (JAXBException e) {
            logger.error(e.getMessage(), e);
        }

        return rawObject;
    }

    public static Element marshallToElement(Object object, String thePackage, Element element)
            throws JAXBException {

        JAXBContext jc = getContext(thePackage);
        Marshaller marshaller = jc.createMarshaller();
        marshaller.marshal(object, element);
        return element;
    }

    public static Object unmarshallFromElement(Element element, String thePackage) throws JAXBException {
        JAXBContext jc = getContext(thePackage);
        Unmarshaller unmarshaller = jc.createUnmarshaller();
        @SuppressWarnings("rawtypes")
        Object obj = ((JAXBElement) unmarshaller.unmarshal(element)).getValue();
        return obj;
    }

}