1 package org.apache.velocity.test.view;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import java.io.BufferedReader;
23 import java.io.FileInputStream;
24 import java.io.InputStreamReader;
25 import java.io.PrintWriter;
26
27 import org.apache.velocity.runtime.RuntimeSingleton;
28 import org.apache.velocity.runtime.parser.node.SimpleNode;
29 import org.apache.velocity.runtime.visitor.NodeViewMode;
30
31 /**
32 * Simple class for dumping the AST for a template.
33 * Good for debugging and writing new directives.
34 */
35 public class TemplateNodeView
36 {
37 /**
38 * Root of the AST node structure that results from
39 * parsing a template.
40 */
41 private SimpleNode document;
42
43 /**
44 * Visitor used to traverse the AST node structure
45 * and produce a visual representation of the
46 * node structure. Very good for debugging and
47 * writing new directives.
48 */
49 private NodeViewMode visitor;
50
51 /**
52 * Default constructor: sets up the Velocity
53 * Runtime, creates the visitor for traversing
54 * the node structure and then produces the
55 * visual representation by the visitation.
56 */
57 public TemplateNodeView(String template)
58 {
59 try
60 {
61 RuntimeSingleton.init("velocity.properties");
62
63 InputStreamReader isr = new InputStreamReader(
64 new FileInputStream(template),
65 RuntimeSingleton.getString(RuntimeSingleton.INPUT_ENCODING));
66
67 BufferedReader br = new BufferedReader( isr );
68
69 document = RuntimeSingleton.parse( br, template);
70
71 visitor = new NodeViewMode();
72 visitor.setContext(null);
73 visitor.setWriter(new PrintWriter(System.out));
74 document.jjtAccept(visitor, null);
75 }
76 catch (Exception e)
77 {
78 System.out.println(e);
79 e.printStackTrace();
80 }
81 }
82 }