org.tec.webapp.web.view.JSONView.java Source code

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Here is the source code for org.tec.webapp.web.view.JSONView.java

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/*******************************************************************************
 * Copyright 2014 org.tec
 *
 * 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 org.tec.webapp.web.view;

import java.io.PrintWriter;
import java.util.Map;

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

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.util.MimeTypeUtils;
import org.springframework.web.servlet.view.AbstractView;
import org.tec.webapp.json.JSONSerializable;
import org.tec.webapp.web.model.JSONModelAndView;

/**
 * base spring view for application that is json data
 */
public class JSONView extends AbstractView {
    /** the logger */
    protected Log mLogger = LogFactory.getLog(this.getClass());

    /**
     * {@inheritDoc}
     */
    @Override()
    protected void renderMergedOutputModel(Map<String, Object> model, HttpServletRequest request,
            HttpServletResponse response) throws Exception {
        try {
            JSONSerializable json = (JSONSerializable) model.get(JSONModelAndView.ERROR_KEY);

            if (json != null) {
                response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "failed to process response");
            } else {
                json = (JSONSerializable) model.get(JSONModelAndView.JSON_KEY);

                if (json != null) {
                    if (mLogger.isDebugEnabled()) {
                        mLogger.debug("JSON Response\n" + json.toJSON());
                    }
                    response.setContentType(MimeTypeUtils.APPLICATION_JSON_VALUE);
                    PrintWriter pw = response.getWriter();
                    pw.write(json.toJSON());
                    pw.flush();
                } else // null json for controllers that usurp the response or didn't intend to
                {
                    mLogger.warn("null json object");
                }
            }
        } catch (Exception e) {
            mLogger.error("error", e);
            response.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "failed to process response");
        }
    }
}