package org.apache.velocity.test.view; /* * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ import org.apache.velocity.Template; import org.apache.velocity.runtime.RuntimeSingleton; import org.apache.velocity.runtime.parser.node.SimpleNode; import org.apache.velocity.runtime.visitor.NodeViewMode; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.InputStreamReader; import java.io.PrintWriter; /** * Simple class for dumping the AST for a template. * Good for debugging and writing new directives. */ public class TemplateNodeView { /** * Root of the AST node structure that results from * parsing a template. */ private SimpleNode document; /** * Visitor used to traverse the AST node structure * and produce a visual representation of the * node structure. Very good for debugging and * writing new directives. */ private NodeViewMode visitor; /** * Default constructor: sets up the Velocity * Runtime, creates the visitor for traversing * the node structure and then produces the * visual representation by the visitation. */ public TemplateNodeView(String templateFile) { try { RuntimeSingleton.init("velocity.properties"); InputStreamReader isr = new InputStreamReader( new FileInputStream(templateFile), RuntimeSingleton.getString(RuntimeSingleton.INPUT_ENCODING)); BufferedReader br = new BufferedReader( isr ); Template tmpl = new Template(); tmpl.setName(templateFile); document = RuntimeSingleton.parse( br, tmpl); visitor = new NodeViewMode(); visitor.setContext(null); visitor.setWriter(new PrintWriter(System.out)); document.jjtAccept(visitor, null); } catch (Exception e) { System.out.println(e); e.printStackTrace(); } } }