org.sakaiproject.resteasy.DefaultJsonProvider.java Source code

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Here is the source code for org.sakaiproject.resteasy.DefaultJsonProvider.java

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/*
 * Licensed to the Sakai Foundation (SF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The SF 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.sakaiproject.resteasy;

import net.sf.json.JSONObject;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;

import javax.ws.rs.Produces;
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 javax.xml.bind.annotation.XmlRootElement;

/**
 * Provides JSON serialization for arbitrary pojos returned by JAX-RS annotated
 * resources as long as no {@link XmlRootElement} or {@link XmlType} annotations
 * are present.
 */
@Provider
@Produces(MediaType.APPLICATION_JSON)
public class DefaultJsonProvider implements MessageBodyWriter<Object> {
    /**
     *
     */
    private static final Log LOG = LogFactory.getLog(DefaultJsonProvider.class);

    /**
     * {@inheritDoc}
     *
     * @see javax.ws.rs.ext.MessageBodyWriter#getSize(java.lang.Object,
     *      java.lang.Class, java.lang.reflect.Type,
     *      java.lang.annotation.Annotation[], javax.ws.rs.core.MediaType)
     */
    public long getSize(Object model, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType) {
        // TODO Cache in Threadlocal if this duplicate serialization becomes
        // problematic
        try {
            return JSONObject.fromObject(model).toString().getBytes("UTF-8").length;
        } catch (UnsupportedEncodingException e) {
            LOG.error(e);
            return 0;
        }
    }

    /**
     * {@inheritDoc}
     *
     * @see javax.ws.rs.ext.MessageBodyWriter#isWriteable(java.lang.Class,
     *      java.lang.reflect.Type, java.lang.annotation.Annotation[],
     *      javax.ws.rs.core.MediaType)
     */
    public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return !type.isAnnotationPresent(XmlRootElement.class);
    }

    /**
     * {@inheritDoc}
     *
     * @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)
     */
    public void writeTo(Object model, Class<?> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, Object> headers, OutputStream os) throws IOException {
        JSONObject jsonObject = JSONObject.fromObject(model);
        os.write(jsonObject.toString().getBytes("UTF-8"));
    }
}