/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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.springframework.web.servlet.view;

import java.util.Map;

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

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

import net.sf.json.JSON;
import net.sf.json.JSONSerializer;
import net.sf.json.JsonConfig;

/**
 * A View that renders its model as a JSON object.
 * 
 * @author Andres Almiray <aalmiray@users.sourceforge.net>
 * @author Domenico Testa <domenico.testa@gmail.com>
 */
public class JsonView extends AbstractView {

	/** Default content type. Overridable as bean property. */
	private static final String DEFAULT_JSON_CONTENT_TYPE = "application/json";

	/** JSON rendering configuration profile */
	private JsonConfig config;

	public JsonView() {
		super();
		setContentType(DEFAULT_JSON_CONTENT_TYPE);
	}

	/**
	 * Returns the JsonConfig instance for this serializer
	 * 
	 * @return JsoConfig bean
	 */
	public JsonConfig getConfig() {
		return this.config;
	}

	public void setConfig(JsonConfig config) {
		this.config = config;
	}

	/**
	 * Returns wether the JSONSerializer will ignore or not its internal
	 * property exclusions.
	 * 
	 * @deprecated
	 */
	public boolean isIgnoreDefaultExcludes() {
		return getConfig().isIgnoreDefaultExcludes();
	}

	/**
	 * Sets the group of properties to be excluded.
	 * 
	 * @deprecated
	 */
	public void setExcludedProperties(String[] excludedProperties) {
		getConfig().setExcludes(excludedProperties);
	}

	/**
	 * Sets wether the JSONSerializer will ignore or not its internal property
	 * exclusions.
	 * 
	 * @deprecated
	 */
	public void setIgnoreDefaultExcludes(boolean ignoreDefaultExcludes) {
		getConfig().setIgnoreDefaultExcludes(ignoreDefaultExcludes);
	}

	/**
	 * Creates a JSON [JSONObject,JSONArray,JSONNUll] from the model values.
	 */
	protected JSON createJSON(Map model, HttpServletRequest request,
			HttpServletResponse response) {
		return defaultCreateJSON(model);
	}

	/**
	 * Creates a JSON [JSONObject,JSONArray,JSONNUll] from the model values.
	 */
	protected final JSON defaultCreateJSON(Map model) {
		return JSONSerializer.toJSON(model, getConfig());
	}

	/**
	 * Returns the group of properties to be excluded.
	 * 
	 * @deprecated
	 */
	protected String[] getExcludedProperties() {
		return getConfig().getExcludes();
	}

	protected void renderMergedOutputModel(Map model,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		response.setContentType(getContentType());
		JSON json = createJSON(model, request, response);
		json.write(response.getWriter());
	}
}