/*

  * Licensed to the Apache Software Foundation (ASF) under one

  * or more contributor license agreements. See the NOTICE file

  * distributed with this work for additional information

  * regarding copyright ownership. The ASF licenses this file

  * to you 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.apache.shindig.social.core.util;

 import org.apache.shindig.social.opensocial.service.BeanConverter;

 import net.sf.json.JSONArray;

 import net.sf.json.JSONException;

 import net.sf.json.JSONObject;

 import net.sf.json.JsonConfig;

 import net.sf.json.util.JSONUtils;

 import com.google.inject.Inject;

 import com.google.inject.Injector;

 import com.google.inject.name.Named;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import java.lang.reflect.Array;

 import java.util.List;

 /**

  * BeanConverter implementation us the net.sf.json-lib json library.

  */

 public class BeanJsonLibConverter implements BeanConverter {

   /**

    * The Logger.

    */

   protected static final Log LOG = LogFactory.getLog(BeanJsonLibConverter.class);

   /**

    * The Guice injector used to create beans.

    */

   private Injector injector;

   /**

    * Json Config object used by each instance.

    */

   private JsonConfig jsonConfig;

   /**

    * in IDE debug flag.

    */

   private boolean debugMode = false;

   /**

    * Create an BeanConverter with an injector.

    * @param injector the Guice injector to use for conversion

    * @param jsonConfig the Json Configuration

    */

   @Inject

   public BeanJsonLibConverter(Injector injector,

       @Named("ShindigJsonConfig") JsonConfig jsonConfig) {

     this.injector = injector;

     this.jsonConfig = jsonConfig;

   }

   public String getContentType() {

     return "application/json";

   }

   /**

    * Convert the json string into a pojo based on the supplied root class.

    * @param string the json string

    * @param rootBeanClass the root class of the bean

    * @param <T> The typep of the pojo to be returned

    * @return A pojo of the same type as the rootBeanClass

    */

   @SuppressWarnings("unchecked")

   public <T> T convertToObject(String string, final Class<T> rootBeanClass) {

     if ("".equals(string)) {

       string = "{}";

     }

     if (string.startsWith("[")) {

       JSONArray jsonArray = JSONArray.fromObject(string, jsonConfig);

       if (debugMode) {

         JsonLibConverterUtils.dumpJsonArray(jsonArray, " ");

       }

       if (rootBeanClass.isArray()) {

         Class<?> componentType = rootBeanClass.getComponentType();

         Object rootObject = injector.getInstance(componentType);

         List<?> o = JSONArray.toList(jsonArray, rootObject, jsonConfig);

         Object[] result = (Object[]) Array.newInstance(componentType, o.size());

         for (int i = 0; i < o.size(); i++) {

           result[i] = o.get(i);

         }

         return (T) result;

       } else {

         T rootObject = injector.getInstance(rootBeanClass);

         Object o = JSONArray.toArray(jsonArray, rootObject, jsonConfig);

         return (T) o;

       }

     } else {

       JSONObject jsonObject = JSONObject.fromObject(string, jsonConfig);

       if (debugMode) {

         JsonLibConverterUtils.dumpJsonObject(jsonObject, " ");

       }

       T rootObject = injector.getInstance(rootBeanClass);

       Object o = JSONObject.toBean(jsonObject, rootObject, jsonConfig);

       return (T) o;

     }

   }

   /**

    * Convert the pojo to a json string representation.

    * @param pojo the pojo to convert

    * @return the json string representation of the pojo.

    */

   public String convertToString(Object pojo) {

     if ("".equals(pojo)) {

       return "{}";

     }

     try {

       JSONObject jsonObject = JSONObject.fromObject(pojo, jsonConfig);

       return jsonObject.toString();

     } catch (JSONException jse) {

       Class<?> pojoClass = pojo.getClass();

       if (JSONUtils.isArray(pojoClass)) {

         JSONArray jsonArray = JSONArray.fromObject(pojo);

         String result = jsonArray.toString();

         return result;

       }

       throw jse;

     }

   }

   /**

    * Add a mapping to the json -> pojo conversion map.

    * @param key the name of the json key to bind to

    * @param class1 the class that should be used to represent that key

    */

   @SuppressWarnings("unchecked")

   public void addMapping(String key, Class<?> class1) {

     jsonConfig.getClassMap().put(key, class1);

   }

 }