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 org.apache.velocity.Template; 23 import org.apache.velocity.runtime.RuntimeSingleton; 24 import org.apache.velocity.runtime.parser.node.SimpleNode; 25 import org.apache.velocity.runtime.visitor.NodeViewMode; 26 27 import java.io.BufferedReader; 28 import java.io.FileInputStream; 29 import java.io.InputStreamReader; 30 import java.io.PrintWriter; 31 32 /** 33 * Simple class for dumping the AST for a template. 34 * Good for debugging and writing new directives. 35 */ 36 public class TemplateNodeView 37 { 38 /** 39 * Root of the AST node structure that results from 40 * parsing a template. 41 */ 42 private SimpleNode document; 43 44 /** 45 * Visitor used to traverse the AST node structure 46 * and produce a visual representation of the 47 * node structure. Very good for debugging and 48 * writing new directives. 49 */ 50 private NodeViewMode visitor; 51 52 /** 53 * Default constructor: sets up the Velocity 54 * Runtime, creates the visitor for traversing 55 * the node structure and then produces the 56 * visual representation by the visitation. 57 */ TemplateNodeView(String templateFile)58 public TemplateNodeView(String templateFile) 59 { 60 try 61 { 62 RuntimeSingleton.init("velocity.properties"); 63 64 InputStreamReader isr = new InputStreamReader( 65 new FileInputStream(templateFile), 66 RuntimeSingleton.getString(RuntimeSingleton.INPUT_ENCODING)); 67 68 BufferedReader br = new BufferedReader( isr ); 69 70 Template tmpl = new Template(); 71 tmpl.setName(templateFile); 72 document = RuntimeSingleton.parse( br, tmpl); 73 74 visitor = new NodeViewMode(); 75 visitor.setContext(null); 76 visitor.setWriter(new PrintWriter(System.out)); 77 document.jjtAccept(visitor, null); 78 } 79 catch (Exception e) 80 { 81 System.out.println(e); 82 e.printStackTrace(); 83 } 84 } 85 } 86