+++ /dev/null
-/*--------------------------------------------------------------------------\r
- * Copyright 2009 Taro L. Saito\r
- *\r
- * Licensed under the Apache License, Version 2.0 (the "License");\r
- * you may not use this file except in compliance with the License.\r
- * You may obtain a copy of the License at\r
- *\r
- * http://www.apache.org/licenses/LICENSE-2.0\r
- *\r
- * Unless required by applicable law or agreed to in writing, software\r
- * distributed under the License is distributed on an "AS IS" BASIS,\r
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
- * See the License for the specific language governing permissions and\r
- * limitations under the License.\r
- *--------------------------------------------------------------------------*/\r
-//--------------------------------------\r
-// XerialJ\r
-//\r
-// JSONPushParser.java\r
-// Since: Jun 1, 2009 5:52:05 PM\r
-//\r
-// $URL: http://www.xerial.org/svn/project/XerialJ/trunk/xerial-core/src/main/java/org/xerial/json/JSONPushParser.java $\r
-// $Author: leo $\r
-//--------------------------------------\r
-package org.xerial.json;\r
-\r
-import java.io.IOException;\r
-import java.io.Reader;\r
-\r
-import org.xerial.util.ArrayDeque;\r
-import org.xerial.util.tree.TreeEvent;\r
-import org.xerial.util.tree.TreeEventHandler;\r
-import org.xerial.util.tree.TreeParser;\r
-import org.xerial.util.tree.TreeEvent.EventType;\r
-\r
-/**\r
- * Push-style JSON parser\r
- * \r
- * @author leo\r
- * \r
- */\r
-public class JSONPushParser implements TreeParser\r
-{\r
- private final JSONPullParser jsonPullParser;\r
- private JSONEvent lastEvent = null;\r
-\r
- private ArrayDeque<TreeEvent> pendingEventQueue = new ArrayDeque<TreeEvent>();\r
-\r
- public JSONPushParser(String json)\r
- {\r
- jsonPullParser = new JSONPullParser(json);\r
- }\r
-\r
- public JSONPushParser(Reader input) throws IOException\r
- {\r
- jsonPullParser = new JSONPullParser(input);\r
- }\r
-\r
- public void parse(TreeEventHandler handler) throws Exception\r
- {\r
- handler.init();\r
- parseJSON(handler);\r
- handler.finish();\r
- }\r
-\r
- private void flushPendingEvent(TreeEventHandler handler) throws Exception\r
- {\r
- while (!pendingEventQueue.isEmpty())\r
- {\r
- TreeEvent e = pendingEventQueue.removeFirst();\r
- switch (e.event)\r
- {\r
- case VISIT:\r
- handler.visitNode(e.nodeName, e.nodeValue);\r
- break;\r
- case LEAVE:\r
- handler.leaveNode(e.nodeName);\r
- break;\r
- case TEXT:\r
- handler.text(e.nodeName, e.nodeValue);\r
- break;\r
- }\r
- }\r
- }\r
-\r
- private void parseJSON(TreeEventHandler handler) throws Exception\r
- {\r
- while (lastEvent != JSONEvent.EndJSON)\r
- {\r
- lastEvent = jsonPullParser.next();\r
- switch (lastEvent)\r
- {\r
- case StartObject:\r
- {\r
- flushPendingEvent(handler);\r
-\r
- String key = jsonPullParser.getKeyName();\r
- pendingEventQueue.addLast(TreeEvent.newVisitEvent(key, null));\r
- break;\r
- }\r
- case EndObject:\r
- {\r
- flushPendingEvent(handler);\r
- String key = jsonPullParser.getKeyName();\r
- handler.leaveNode(key);\r
- break;\r
- }\r
- case String:\r
- case Integer:\r
- case Double:\r
- case Boolean:\r
- case Null:\r
- {\r
- String key = jsonPullParser.getKeyName();\r
- String value = lastEvent != JSONEvent.Null ? jsonPullParser.getText() : null;\r
-\r
- // if first child element is value attribute\r
- if (key != null)\r
- {\r
- if (key.equals("value") && !pendingEventQueue.isEmpty())\r
- {\r
- TreeEvent e = pendingEventQueue.peekLast();\r
- if (e.event == EventType.VISIT)\r
- {\r
- pendingEventQueue.removeLast();\r
- pendingEventQueue.addLast(TreeEvent.newVisitEvent(e.nodeName, value));\r
- break;\r
- }\r
- }\r
- }\r
-\r
- flushPendingEvent(handler);\r
- handler.visitNode(key, value);\r
- handler.leaveNode(key);\r
- break;\r
- }\r
- case StartArray:\r
- case EndArray:\r
- case EndJSON:\r
- // do nothing\r
- break;\r
- }\r
-\r
- }\r
- }\r
-}\r