GenericArtifactMessageBodyWriter.java

/*
 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 *   WSO2 Inc. licenses this file to you 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.wso2.carbon.governance.rest.api.internal;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.wso2.carbon.governance.api.common.dataobjects.GovernanceArtifact;
import org.wso2.carbon.governance.api.exception.GovernanceException;
import org.wso2.carbon.governance.rest.api.model.TypedList;
import org.wso2.carbon.governance.rest.api.util.Util;

import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;


@Provider
@Consumes({"application/json"})
public class GenericArtifactMessageBodyWriter implements MessageBodyWriter<TypedList<GovernanceArtifact>> {

    private final Log log = LogFactory.getLog(GenericArtifactMessageBodyWriter.class);

    @Context
    UriInfo uriInfo;

    @Override
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        if (TypedList.class.isAssignableFrom(type)) {
            return true;
        }
        return false;
    }

    @Override
    public long getSize(TypedList<GovernanceArtifact> typedList, Class<?> type, Type genericType, Annotation[] annotations,
                        MediaType mediaType) {
        return 0;
    }

    @Override
    public void writeTo(TypedList<GovernanceArtifact> typedList, Class<?> type, Type genericType, Annotation[] annotations,
                        MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream)
            throws IOException, WebApplicationException {
        GenericArtifactJSONWriter messageWriter = new GenericArtifactJSONWriter();
        try {
            messageWriter.writeTo(typedList, entityStream, Util.getBaseURL(uriInfo));
        } catch (GovernanceException e) {
            log.error(e);
            throw new WebApplicationException(Response.Status.INTERNAL_SERVER_ERROR);
        }
    }


}