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    • com.vmware.vcloud.api.rest.client.XStreamXmlProvider Maven / Gradle / Ivy

    There is a newer version: 0.10.0
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    /* **********************************************************************
 * api-extension-template-vcloud-director
 * Copyright 2018 VMware, Inc.
 * SPDX-License-Identifier: BSD-2-Clause
 * *********************************************************************/

package com.vmware.vcloud.api.rest.client;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.Consumes;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.MessageBodyWriter;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * JAX-RS's Provider to handle XStream in XML format.
 */
@Produces({"application/xml", "application/*+xml", "text/xml" })
@Consumes({"application/xml", "application/*+xml", "text/xml" })
public class XStreamXmlProvider implements MessageBodyReader, MessageBodyWriter {
    private static final Set processed = new HashSet<>();
    private static final XStream xstream = new XStream();
    private static final String DEFAULT_ENCODING = "utf-8";


    @Override
    public boolean isReadable(Class classType, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType) {
        return classType.getAnnotation(XStreamAlias.class) != null;
    }

    @Override
    public Object readFrom(Class classType, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType,
                           MultivaluedMap httpHeaders, InputStream entityStream) throws IOException, WebApplicationException {
        String encoding = getCharsetAsString(mediaType);
        XStream xStream = getXStream(classType);
        return xStream.fromXML(new InputStreamReader(entityStream, encoding));
    }

    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType) {
        return type.getAnnotation(XStreamAlias.class) != null;
    }

    @Override
    public long getSize(Object o, Class type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(Object o, Class type, Type genericType, Annotation[] annotations, javax.ws.rs.core.MediaType mediaType,
                        MultivaluedMap httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        String encoding = getCharsetAsString(mediaType);
        XStream xStream = getXStream(o.getClass());
        xStream.toXML(o, new OutputStreamWriter(entityStream, encoding));
    }


    protected static String getCharsetAsString(javax.ws.rs.core.MediaType mediaType) {
        if (mediaType == null) {
            return DEFAULT_ENCODING;
        }
        String result = mediaType.getParameters().get("charset");
        return (result == null) ? DEFAULT_ENCODING : result;
    }

    protected XStream getXStream(Class type) {
        synchronized (processed) {
            if (!processed.contains(type)) {
                xstream.processAnnotations(type);
                processed.add(type);
            }
        }
        return xstream;
    }
}
    
    
    
    

    




    
    
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