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EMC Atmos Client for Java - provides REST access to object data on EMC platforms using the Atmos API.
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/*
 * Copyright (c) 2013-2016, EMC Corporation.
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * + Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * + Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * + The name of EMC Corporation may not be used to endorse or promote
 *   products derived from this software without specific prior written
 *   permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.emc.acdp.util;

import com.emc.cdp.services.rest.model.ObjectFactory;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.StringReader;
import java.io.StringWriter;

public class XmlUtil {
    private XmlUtil() {
    }

    private static JAXBContext jaxbContext;
    private static ThreadLocal marshaller = new ThreadLocal();
    private static ThreadLocal unmarshaller = new ThreadLocal();

    static {
        try {
            jaxbContext = JAXBContext.newInstance( "com.emc.cdp.services.rest.model",
                                                   ObjectFactory.class.getClassLoader() );
        } catch ( JAXBException e ) {
            // unrecoverable
            throw new RuntimeException( e );
        }
    }

    public static String marshal( Object bean ) throws JAXBException {
        StringWriter writer = new StringWriter();
        getMarshaller().marshal( bean, writer );
        return writer.toString();
    }

    public static void marshal( Object bean, OutputStream os ) throws JAXBException {
        getMarshaller().marshal( bean, os );
    }

    @SuppressWarnings( "unchecked" )
    public static  T unmarshal( Class beanClass, String xml ) throws JAXBException {
        StringReader reader = new StringReader( xml );
        return (T) getUnmarshaller().unmarshal( reader );
    }

    @SuppressWarnings( "unchecked" )
    public static  T unmarshal( Class beanClass, InputStream is ) throws JAXBException {
        return (T) getUnmarshaller().unmarshal( is );
    }

    private static Marshaller getMarshaller() throws JAXBException {
        Marshaller m = marshaller.get();
        if ( m == null ) {
            m = jaxbContext.createMarshaller();
            marshaller.set( m );
        }
        return m;
    }

    private static Unmarshaller getUnmarshaller() throws JAXBException {
        Unmarshaller um = unmarshaller.get();
        if ( um == null ) {
            um = jaxbContext.createUnmarshaller();
            unmarshaller.set( um );
        }
        return um;
    }
}