svn commit: r485986 - /incubator/ofbiz/trunk/framework/webapp/src/org/ofbiz/webapp/event/JSONServiceEventHandler.java

[jaz-3]

Author: jaz
Date: Mon Dec 11 18:29:24 2006
New Revision: 485986

URL: http://svn.apache.org/viewvc?view=rev&rev=485986
Log:
added event handler to wrap around the service event handler and return the output as a JSONObject (for use w/ AJAX)

Added:
    incubator/ofbiz/trunk/framework/webapp/src/org/ofbiz/webapp/event/JSONServiceEventHandler.java   (with props)

Added: incubator/ofbiz/trunk/framework/webapp/src/org/ofbiz/webapp/event/JSONServiceEventHandler.java
URL: http://svn.apache.org/viewvc/incubator/ofbiz/trunk/framework/webapp/src/org/ofbiz/webapp/event/JSONServiceEventHandler.java?view=auto&rev=485986
==============================================================================
--- incubator/ofbiz/trunk/framework/webapp/src/org/ofbiz/webapp/event/JSONServiceEventHandler.java (added)
+++ incubator/ofbiz/trunk/framework/webapp/src/org/ofbiz/webapp/event/JSONServiceEventHandler.java Mon Dec 11 18:29:24 2006
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2001-2006 The Apache Software Foundation
+ *
+ * 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.ofbiz.webapp.event;
+
+import java.io.IOException;
+import java.io.Writer;
+import java.util.Enumeration;
+import java.util.Map;
+import java.util.List;
+import javax.servlet.ServletContext;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import javolution.util.FastMap;
+import net.sf.json.JSONObject;
+
+import org.ofbiz.base.util.Debug;
+
+/**
+ * JSONServiceEventHandler - JSON Object Wrapper around the ServiceEventHandler
+ */
+public class JSONServiceEventHandler implements EventHandler {
+
+    public static final String module = JSONServiceEventHandler.class.getName();
+    protected EventHandler service;
+
+    public void init(ServletContext context) throws EventHandlerException {
+        this.service = new ServiceEventHandler();
+        this.service.init(context);
+    }
+
+    public String invoke(String eventPath, String eventMethod, HttpServletRequest request, HttpServletResponse response) throws EventHandlerException {
+        // call into the service handler for parameters parsing and invocation
+        String respCode = service.invoke(eventPath, eventMethod, request, response);
+
+        // pull out the service response from the request attribute
+        Map attrMap = getAttributesAsMap(request);
+
+        // create a JSON Object for return
+        JSONObject json = JSONObject.fromMap(attrMap);
+        String jsonStr = json.toString();
+        if (jsonStr == null) {
+            throw new EventHandlerException("JSON Object was empty; fatal error!");
+        }
+
+        // set the X-JSON content type
+        response.setContentType("application/x-json");
+        response.setContentLength(jsonStr.length());
+
+        // return the JSON String
+        Writer out;
+        try {
+            out = response.getWriter();
+            out.write(jsonStr);
+            out.flush();
+        } catch (IOException e) {
+            throw new EventHandlerException("Unable to get response writer", e);
+        }
+
+        return respCode;
+    }
+
+    private Map getAttributesAsMap(HttpServletRequest request) {
+        Map attrMap = FastMap.newInstance();
+        Enumeration en = request.getAttributeNames();
+        while (en.hasMoreElements()) {
+            String name = (String) en.nextElement();
+            Object val = request.getAttribute(name);
+            if (val instanceof String || val instanceof Number || val instanceof Map || val instanceof List) {
+                Debug.log("Adding attribute to JSON output: " + name, module);
+                attrMap.put(name, val);
+            }
+        }
+
+        return attrMap;
+    }
+}

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