NodeHandler internal class cleanup

Change NodeHandler to not be an internal class creating itself but
rather a method in default scope.  Have it perform the get and simply
return the NodeHandler as that is the only usage.

Author: hazendaz

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

@@ -76,7 +76,7 @@ List<SqlNode> parseDynamicTags(XNode node) {
         }
       } else if (child.getNode().getNodeType() == Node.ELEMENT_NODE) { // issue #628
         String nodeName = child.getNode().getNodeName();
-        NodeHandler handler = nodeHandlers.get(nodeName);
+        NodeHandler handler = nodeHandlers(nodeName);
         if (handler == null) {
           throw new BuilderException("Unknown element <" + nodeName + "> in SQL statement.");
         }
@@ -87,21 +87,19 @@ List<SqlNode> parseDynamicTags(XNode node) {
     return contents;
   }
 
-  private Map<String, NodeHandler> nodeHandlers = new HashMap<String, NodeHandler>() {
-    private static final long serialVersionUID = 7123056019193266281L;
-
-    {
-      put("trim", new TrimHandler());
-      put("where", new WhereHandler());
-      put("set", new SetHandler());
-      put("foreach", new ForEachHandler());
-      put("if", new IfHandler());
-      put("choose", new ChooseHandler());
-      put("when", new IfHandler());
-      put("otherwise", new OtherwiseHandler());
-      put("bind", new BindHandler());
-    }
-  };
+  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);
+  }
 
   private interface NodeHandler {
     void handleNode(XNode nodeToHandle, List<SqlNode> targetContents);
@@ -234,7 +232,7 @@ private void handleWhenOtherwiseNodes(XNode chooseSqlNode, List<SqlNode> ifSqlNo
       List<XNode> children = chooseSqlNode.getChildren();
       for (XNode child : children) {
         String nodeName = child.getNode().getNodeName();
-        NodeHandler handler = nodeHandlers.get(nodeName);
+        NodeHandler handler = nodeHandlers(nodeName);
         if (handler instanceof IfHandler) {
           handler.handleNode(child, ifSqlNodes);
         } else if (handler instanceof OtherwiseHandler) {