de.topicmapslab.majortom.server.http.util.JSONView.java Source code

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Here is the source code for de.topicmapslab.majortom.server.http.util.JSONView.java

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/*******************************************************************************
 * Copyright 2011 Hannes Niederhausen, Topic Maps Lab
 * 
 * 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 de.topicmapslab.majortom.server.http.util;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.view.AbstractView;

/**
 * View which gets an already rendered json string.
 * 
 * @author Hannes Niederhausen
 * 
 */
public class JSONView extends AbstractView {

    private String jsonString;
    private String callback;

    /**
     * Constructor
     * @param jsonString result json String
     */
    public JSONView(String jsonString) {
        this.jsonString = jsonString;
    }

    /**
     * Constructor
     * 
     * @param jsonString the json string
     * @param callback a callback function name for JSONP
     */
    public JSONView(String jsonString, String callback) {
        super();
        this.jsonString = jsonString;
        this.callback = callback;
    }

    @Override
    protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
            HttpServletResponse response) throws Exception {

        response.setCharacterEncoding("UTF-8");

        if (callback != null) {
            response.setContentType("application/javascript");
            response.getWriter().write(callback);
            response.getWriter().write("(");
            response.getWriter().write(jsonString);
            response.getWriter().write(");");
        } else {
            response.setContentType("application/json");
            response.getWriter().write(jsonString);
        }
    }
}