misc:enhance nodeHandlerMap ,using a global Map instead of local variables

Author: wei.zw

src/main/java/org/apache/ibatis/scripting/xmltags/XMLScriptBuilder.java

@@ -37,6 +37,7 @@ public class XMLScriptBuilder extends BaseBuilder {
   private final XNode context;
   private boolean isDynamic;
   private final Class<?> parameterType;
+  private final Map<String, NodeHandler> nodeHandlerMap = new HashMap<String, NodeHandler>();
 
   public XMLScriptBuilder(Configuration configuration, XNode context) {
     this(configuration, context, null);
@@ -48,6 +49,19 @@ public XMLScriptBuilder(Configuration configuration, XNode context, Class<?> par
     this.parameterType = parameterType;
   }
 
+
+  private void initNodeHandlerMap(){
+      nodeHandlerMap.put("trim", new TrimHandler());
+      nodeHandlerMap.put("where", new WhereHandler());
+      nodeHandlerMap.put("set", new SetHandler());
+      nodeHandlerMap.put("foreach", new ForEachHandler());
+      nodeHandlerMap.put("if", new IfHandler());
+      nodeHandlerMap.put("choose", new ChooseHandler());
+      nodeHandlerMap.put("when", new IfHandler());
+      nodeHandlerMap.put("otherwise", new OtherwiseHandler());
+      nodeHandlerMap.put("bind", new BindHandler());
+  }
+
   public SqlSource parseScriptNode() {
     List<SqlNode> contents = parseDynamicTags(context);
     MixedSqlNode rootSqlNode = new MixedSqlNode(contents);
@@ -88,17 +102,7 @@ List<SqlNode> parseDynamicTags(XNode node) {
   }
 
   NodeHandler nodeHandlers(String nodeName) {
-    Map<String, NodeHandler> map = new HashMap<String, NodeHandler>();
-    map.put("trim", new TrimHandler());
-    map.put("where", new WhereHandler());
-    map.put("set", new SetHandler());
-    map.put("foreach", new ForEachHandler());
-    map.put("if", new IfHandler());
-    map.put("choose", new ChooseHandler());
-    map.put("when", new IfHandler());
-    map.put("otherwise", new OtherwiseHandler());
-    map.put("bind", new BindHandler());
-    return map.get(nodeName);
+    return nodeHandlerMap.get(nodeName);
   }
 
   private interface NodeHandler {