com.cloudera.lib.wsrs.JSONMapProvider.java Source code

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Here is the source code for com.cloudera.lib.wsrs.JSONMapProvider.java

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/*
 * Copyright (c) 2011, Cloudera, Inc. All Rights Reserved.
 *
 * Cloudera, 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
 *
 * This software 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.cloudera.lib.wsrs;

import org.json.simple.JSONObject;

import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyWriter;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Map;

@Provider
@Produces(MediaType.APPLICATION_JSON)
public class JSONMapProvider implements MessageBodyWriter<Map> {
    private static final String ENTER = System.getProperty("line.separator");

    @Override
    public boolean isWriteable(Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
        return Map.class.isAssignableFrom(aClass);
    }

    @Override
    public long getSize(Map map, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType) {
        return -1;
    }

    @Override
    public void writeTo(Map map, Class<?> aClass, Type type, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap<String, Object> stringObjectMultivaluedMap, OutputStream outputStream)
            throws IOException, WebApplicationException {
        Writer writer = new OutputStreamWriter(outputStream);
        JSONObject.writeJSONString(map, writer);
        writer.write(ENTER);
        writer.flush();
    }

}