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

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

/**
 * Jersey provider to unmarshal lists of entities from Media Services.
 * 
 */
public class ODataEntityCollectionProvider extends AbstractMessageReaderWriterProvider>> {
    private final ODataAtomUnmarshaller unmarshaller;

    public ODataEntityCollectionProvider() throws JAXBException {
        unmarshaller = new ODataAtomUnmarshaller();
    }

    @Override
    public boolean isReadable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return ODataEntity.isODataEntityCollectionType(type, genericType);
    }

    @SuppressWarnings("unchecked")
    @Override
    public ListResult> readFrom(Class>> type, Type genericType,
            Annotation[] annotations, MediaType mediaType, MultivaluedMap httpHeaders,
            InputStream entityStream) throws IOException {

        String responseType = mediaType.getParameters().get("type");
        try {
            if (responseType == null || responseType.equals("feed")) {
                return unmarshaller.unmarshalFeed(entityStream,
                        (Class>) ODataEntity.getCollectedType(genericType));
            }
            else {
                throw new RuntimeException();
            }
        }
        catch (JAXBException e) {
            throw new RuntimeException(e);
        }
        catch (ServiceException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Can this type be written by this provider?
     * 
     * @return false - we don't support writing
     */
    @Override
    public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return false;
    }

    /**
     * Write the given object to the stream.
     * This method implementation throws, we don't support writing.
     * 
     * @throws UnsupportedOperationException
     */
    @Override
    public void writeTo(ListResult> t, Class type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap httpHeaders, OutputStream entityStream)
            throws IOException {

        throw new UnsupportedOperationException();
    }

}