com.buabook.http.common.jersey.JsonMessageBodyWriter Maven / Gradle / Ivy

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package com.buabook.http.common.jersey;

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

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 org.json.JSONObject;

/**
 * Jersey Message Body Writer for {@link JSONObject}
 * (c) 2016 Sport Trades Ltd
 * 
 * @author Jas Rajasansir
 * @version 1.0.0
 * @since 14 Jul 2016
 */
@Produces(MediaType.APPLICATION_JSON)
public class JsonMessageBodyWriter implements MessageBodyWriter {

	@Override
	public boolean isWriteable(Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return JSONObject.class.equals(type);
	}
	
	/** As per the documentation, this function always returns -1. */
	@Override
	public long getSize(JSONObject t, Class type, Type genericType, Annotation[] annotations, MediaType mediaType) {
		return -1;
	}

	@Override
	public void writeTo(JSONObject t, Class type, Type genericType, Annotation[] annotations, MediaType mediaType,
			MultivaluedMap httpHeaders, OutputStream entityStream)
			throws IOException, WebApplicationException {
		
		String output = "{}";
		
		if(t != null)
			output = t.toString();
		
		entityStream.write(output.getBytes());
	}

}