com.microsoft.windowsazure.services.media.implementation.ODataEntityProvider Maven / Gradle / Ivy

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/**
 * Copyright Microsoft Corporation
 * 
 * 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 com.microsoft.windowsazure.services.media.implementation;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.List;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.xml.bind.JAXBException;
import javax.xml.parsers.ParserConfigurationException;

import com.microsoft.windowsazure.services.core.ServiceException;
import com.sun.jersey.core.provider.AbstractMessageReaderWriterProvider;

/**
 * An implementation of {@link AbstractMessageReaderWriterProvider } that
 * is used to marshal and unmarshal instances of the ODataEntity type.
 * 
 */
public class ODataEntityProvider extends AbstractMessageReaderWriterProvider> {
    private final ODataAtomUnmarshaller unmarshaller;

    public ODataEntityProvider() throws JAXBException, ParserConfigurationException {
        unmarshaller = new ODataAtomUnmarshaller();
    }

    /* (non-Javadoc)
     * @see javax.ws.rs.ext.MessageBodyReader#isReadable(java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType)
     */
    @Override
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return ODataEntity.isODataEntityType(type);
    }

    /* (non-Javadoc)
     * @see javax.ws.rs.ext.MessageBodyReader#readFrom(java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.InputStream)
     */
    @Override
    public ODataEntity readFrom(Class> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap httpHeaders, InputStream entityStream)
            throws IOException {

        ODataEntity result = null;
        String responseType = mediaType.getParameters().get("type");
        try {
            if (responseType == null || responseType.equals("feed")) {
                List> feedContents = unmarshaller.unmarshalFeed(entityStream, type);
                return feedContents.get(0);
            }
            else if (responseType.equals("entry")) {
                result = unmarshaller.unmarshalEntry(entityStream, type);
            }
            else {
                throw new RuntimeException();
            }
        }
        catch (JAXBException e) {
            throw new RuntimeException(e);
        }
        catch (ServiceException e) {
            throw new RuntimeException(e);
        }

        return result;
    }

    /* (non-Javadoc)
     * @see javax.ws.rs.ext.MessageBodyWriter#isWriteable(java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType)
     */
    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return false;
    }

    /* (non-Javadoc)
     * @see javax.ws.rs.ext.MessageBodyWriter#writeTo(java.lang.Object, java.lang.Class, java.lang.reflect.Type, java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType, javax.ws.rs.core.MultivaluedMap, java.io.OutputStream)
     */
    @Override
    public void writeTo(ODataEntity t, Class type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap httpHeaders, OutputStream entityStream)
            throws IOException {
        throw new UnsupportedOperationException();
    }
}