    001package org.apache.turbine.services.jsonrpc;
    002
    003/*
    004 * Licensed to the Apache Software Foundation (ASF) under one
    005 * or more contributor license agreements.  See the NOTICE file
    006 * distributed with this work for additional information
    007 * regarding copyright ownership.  The ASF licenses this file
    008 * to you under the Apache License, Version 2.0 (the
    009 * "License"); you may not use this file except in compliance
    010 * with the License.  You may obtain a copy of the License at
    011 *
    012 *   http://www.apache.org/licenses/LICENSE-2.0
    013 *
    014 * Unless required by applicable law or agreed to in writing,
    015 * software distributed under the License is distributed on an
    016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    017 * KIND, either express or implied.  See the License for the
    018 * specific language governing permissions and limitations
    019 * under the License.
    020 */
    021
    022import java.io.CharArrayWriter;
    023
    024import javax.servlet.http.HttpServletRequest;
    025
    026import org.apache.commons.logging.Log;
    027import org.apache.commons.logging.LogFactory;
    028import org.jabsorb.JSONRPCBridge;
    029import org.jabsorb.JSONRPCResult;
    030import org.json.JSONArray;
    031import org.json.JSONException;
    032import org.json.JSONObject;
    033
    034/**
    035 * Process a JSON RPC call
    036 *
    037 * @author <a href="mailto:seade@backstagetech.com.au">Scott Eade</a>
    038 */
    039public class JSONProcessor
    040{
    041    /** Log. */
    042    private static Log log = LogFactory.getLog(JSONProcessor.class);
    043
    044    /**
    045     * Process a JSON RPC call
    046     * @param cdata the JSON data
    047     * @param json_bridge the {@link JSONRPCBridge} object
    048     * @param request the request
    049     * @return the return object of the JSON RPC call
    050     */
    051    public static Object processCall(CharArrayWriter cdata, JSONRPCBridge json_bridge, HttpServletRequest request)
    052    {
    053        // Process the request
    054        JSONObject json_req = null;
    055        Object json_res = null;
    056        try
    057        {
    058            json_req = new JSONObject(cdata.toString());
    059            if (log.isDebugEnabled())
    060            {
    061                String methodName = json_req.getString("method");
    062                JSONArray arguments = json_req.getJSONArray("params");
    063
    064                // If this a CallableReference it will have a non-zero objectID
    065                int object_id = json_req.optInt("objectID");
    066                StringBuilder sb = new StringBuilder(".doprocessCall(): call ");
    067                if (object_id != 0)
    068                {
    069                    sb.append("objectID=").append(object_id).append(" ");
    070                }
    071                sb.append(methodName).append("(").append(arguments).append(")");
    072                log.debug(sb.toString());
    073            }
    074            //json_res = json_bridge.call(new Object[] {request}, object_id, methodName, arguments);
    075            json_res = json_bridge.call(new Object[] {request}, json_req);
    076        }
    077        catch (JSONException e)
    078        {
    079            log.error(".processCall(): can't parse call: " + cdata, e);
    080            json_res = JSONRPCResult.MSG_ERR_PARSE;
    081        }
    082        // Write the response
    083        if (log.isDebugEnabled())
    084        {
    085            log.debug(".processCall():  returns " + json_res.toString());
    086        }
    087        return json_res;
    088    }
    089
    090}