org.dihedron.strutlets.renderers.impl.JsonRenderer.java Source code

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Here is the source code for org.dihedron.strutlets.renderers.impl.JsonRenderer.java

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/*
 * Copyright (c) 2012-2015, Andrea Funto'. All rights reserved. See LICENSE for details.
 */

package org.dihedron.strutlets.renderers.impl;

import java.io.IOException;

import javax.portlet.MimeResponse;
import javax.portlet.PortletException;
import javax.portlet.PortletRequest;
import javax.portlet.PortletResponse;

import org.dihedron.strutlets.annotations.Alias;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

/**
 * @author Andrea Funto'
 */
@Alias(JsonRenderer.ID)
public class JsonRenderer extends BeanRenderer {

    /**
     * The renderer unique id.
     */
    public static final String ID = "json";

    /**
     * The MIME type returned as content type by this renderer.
     */
    public static final String JSON_MIME_TYPE = "application/json";

    /**
     * The logger.
     */
    private static final Logger logger = LoggerFactory.getLogger(JsonRenderer.class);

    /**
     * @see org.dihedron.strutlets.renderers.Renderer#getId()
     */
    @Override
    public String getId() {
        return ID;
    }

    /**
     * @see org.dihedron.strutlets.renderers.Renderer#render(javax.portlet.PortletRequest, javax.portlet.PortletResponse, java.lang.String)
     */
    @Override
    public void render(PortletRequest request, PortletResponse response, String data)
            throws IOException, PortletException {

        String bean = data;
        logger.trace("rendering bean '{}'", bean);

        Object object = getBean(request, bean);
        ObjectMapper mapper = new ObjectMapper();
        mapper.enable(SerializationFeature.INDENT_OUTPUT);
        mapper.disable(SerializationFeature.FAIL_ON_EMPTY_BEANS);
        mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        String json = mapper.writeValueAsString(object);
        logger.trace("JSON object is:\n{}", json);

        if (response instanceof MimeResponse) {
            // this works in both RENDER and RESOURCE (AJAX) phases
            ((MimeResponse) response).setContentType(JSON_MIME_TYPE);
        }
        getWriter(response).print(json);
        getWriter(response).flush();

    }
}