werecloud.api.view.JSONView.java Source code

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Here is the source code for werecloud.api.view.JSONView.java

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/*
  werecloud provides a simple API to the VMWare vCenter data.
  Copyright (C) 2015  NigelB
    
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.
    
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
    
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

package werecloud.api.view;

import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import org.springframework.web.servlet.View;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.util.Map;

/**
 * <code>JSONView</code>
 * Date: 28/12/2014
 * Time: 10:58 AM
 */
public class JSONView implements View {
    private boolean outputNulls = false;

    @Override
    public String getContentType() {
        return "application/json";
    }

    @Override
    public void render(Map<String, ?> model, HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        ServletOutputStream out = response.getOutputStream();
        if (model.containsKey("model")) {
            ObjectMapper mapper = new ObjectMapper();
            //use ISO-8601 dates instead of timestamp
            mapper.configure(SerializationConfig.Feature.WRITE_DATES_AS_TIMESTAMPS, false);
            mapper.configure(SerializationConfig.Feature.WRITE_NULL_PROPERTIES, outputNulls);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            mapper.writeValue(bos, model.get("model"));
            response.setContentLength(bos.size());
            response.setContentType("application/json");
            out.write(bos.toByteArray());
            return;
        }
        throw new Exception("Could not find model.");
    }

    public boolean isOutputNulls() {
        return outputNulls;
    }

    public void setOutputNulls(boolean outputNulls) {
        this.outputNulls = outputNulls;
    }
}