org.exoplatform.social.client.api.util.SocialJSONDecodingSupport.java Source code

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Here is the source code for org.exoplatform.social.client.api.util.SocialJSONDecodingSupport.java

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/*
 * Copyright (C) 2003-2011 eXo Platform SAS.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.exoplatform.social.client.api.util;

import java.io.IOException;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.util.EntityUtils;
import org.exoplatform.social.client.api.model.Model;
import org.exoplatform.social.client.api.net.SocialHttpClientException;
import org.json.simple.JSONArray;
import org.json.simple.JSONValue;
import org.json.simple.parser.ContainerFactory;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

/**
 * Created by The eXo Platform SAS
 * Author : eXoPlatform
 *          exo@exoplatform.com
 * Jun 30, 2011  
 */
public class SocialJSONDecodingSupport {
    /**
     * Parse JSON text into java Model object from the input source.
     * and then it's base on the class type.
     * 
     * @param <T> Generic type must extend from Model.
     * @param clazz Class type.
     * @param jsonContent Json content which you need to create the Model
     * @throws ParseException Throw this exception if any
     * 
     */
    public static <T extends Model> T parser(final Class<T> clazz, String jsonContent) throws ParseException {
        JSONParser parser = new JSONParser();
        ContainerFactory containerFactory = new ContainerFactory() {
            public List<T> creatArrayContainer() {
                return new LinkedList<T>();
            }

            public T createObjectContainer() {
                try {
                    return clazz.newInstance();
                } catch (InstantiationException e) {
                    return null;
                } catch (IllegalAccessException e) {
                    return null;
                }
            }
        };
        return (T) parser.parse(jsonContent, containerFactory);
    }

    /**
     * Parse JSON text into java Model object from the input source.
     * and then it's base on the class type.
     * 
     * @param <T> Generic type must extend from Model.
     * @param clazz Class type.
     * @param response HttpResponse which getting the JSONContent.
     * @throws ParseException Throw this exception if any
     * @throws IOException Throw this exception if any
     */
    public static <T extends Model> T parser(final Class<T> clazz, HttpResponse response)
            throws IOException, ParseException {
        //Read InputStream from HttpResponse to Buffered
        HttpEntity entity = SocialHttpClientSupport.processContent(response);
        //Check the content length
        if (entity.getContentLength() != -1) {
            //getting the HttpResponse content
            String jsonContent = EntityUtils.toString(entity);
            //close stream
            SocialHttpClientSupport.consume(entity);
            return parser(clazz, jsonContent);
        } else {
            return null;
        }
    }

    /**
     * Parse JSON text into java Map object from the input source.
     *  
     * @param jsonContent Json content which you need to create the Model
     * @throws ParseException Throw this exception if any
     */
    public static Map parser(String jsonContent) throws ParseException {
        JSONParser parser = new JSONParser();
        ContainerFactory containerFactory = new ContainerFactory() {
            public List creatArrayContainer() {
                return new LinkedList();
            }

            public Map createObjectContainer() {
                return new LinkedHashMap();
            }
        };
        return (Map) parser.parse(jsonContent, containerFactory);
    }

    /**
     * HttpResponse text into java Map object from the input source.
     *  
     * @param response HttpResponse to get the content.
     * @throws ParseException Throw this exception if any
     */
    public static Map parser(HttpResponse response) throws ParseException {
        String jsonContent = null;
        try {
            jsonContent = SocialHttpClientSupport.getContent(response);
        } catch (SocialHttpClientException e) {
            throw new ParseException(0);
        }
        return parser(jsonContent);
    }

    /**
     *  
     * @author Ly Minh Phuong - http://phuonglm.net
     * @param <T>
     * @param clazz
     * @param response
     * @return
     * @throws IOException
     * @throws ParseException
     */
    public static <T extends Model> List<T> JSONArrayObjectParser(final Class<T> clazz, HttpResponse response)
            throws IOException, ParseException {
        //Read InputStream from HttpResponse to Buffered
        HttpEntity entity = SocialHttpClientSupport.processContent(response);
        //Check the content length
        if (entity.getContentLength() != -1) {
            //getting the HttpResponse content
            String jsonContent = EntityUtils.toString(entity);
            //close stream
            SocialHttpClientSupport.consume(entity);
            return JSONArrayObjectParser(clazz, jsonContent);
        } else {
            return null;
        }
    }

    /**
     * 
     * @author Ly Minh Phuong - http://phuonglm.net
     * @param <T>
     * @param clazz
     * @param jsonArrayContent
     * @return
     * @throws IOException
     * @throws ParseException
     */
    public static <T extends Model> List<T> JSONArrayObjectParser(final Class<T> clazz, String jsonArrayContent)
            throws IOException, ParseException {
        JSONArray jsonResultArray = (JSONArray) JSONValue.parse(jsonArrayContent);
        List<T> result = new ArrayList<T>();
        for (Object jsonObject : jsonResultArray) {
            String jsonString = jsonObject.toString();
            result.add(parser(clazz, jsonString));
        }
        return result;
    }
}