1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2003 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
25 *
26 * 4. The names "The Jakarta Project", "Velocity", and "Apache Software
27 * Foundation" must not be used to endorse or promote products derived
28 * from this software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache"
32 * nor may "Apache" appear in their names without prior written
33 * permission of the Apache Group.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
53 */
54
55 package net.sf.navigator.displayer;
56
57 import org.apache.velocity.context.InternalContextAdapter;
58 import org.apache.velocity.runtime.parser.node.Node;
59 import org.apache.velocity.runtime.parser.node.SimpleNode;
60 import org.apache.velocity.runtime.directive.Directive;
61 import org.apache.velocity.runtime.parser.ParserTreeConstants;
62 import org.apache.velocity.exception.MethodInvocationException;
63 import org.apache.velocity.exception.ResourceNotFoundException;
64 import org.apache.velocity.exception.ParseErrorException;
65
66 import org.apache.velocity.runtime.parser.node.ASTReference;
67
68 import java.io.Writer;
69 import java.io.IOException;
70 import java.util.Map;
71 import java.util.HashMap;
72 import java.util.Iterator;
73
74
75 /**
76 * Simple directive to provide ability to trap a local value for
77 * iteration.
78 *
79 * Ex :
80 *
81 * #set($foo = 1)
82 * $foo
83 * #local($foo)
84 * #set($foo = 2)
85 * $foo
86 * #end
87 * $foo
88 *
89 * should output
90 *
91 * 1
92 * 2
93 * 1
94 *
95 * @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
96 * @version $Id: LocalDirective.java,v 1.1 2003/10/31 05:59:06 mraible Exp $
97 */
98 public class LocalDirective extends Directive
99 {
100 public String getName()
101 {
102 return "local";
103 }
104
105 public int getType()
106 {
107 return BLOCK;
108 }
109
110 public boolean render(InternalContextAdapter context,
111 Writer writer, Node node)
112 throws IOException, MethodInvocationException, ResourceNotFoundException,
113 ParseErrorException
114 {
115 Map data = new HashMap();
116
117 int num = node.jjtGetNumChildren();
118
119 /*
120 * get the references
121 */
122
123 for (int i=0; i < num; i++)
124 {
125 SimpleNode child = (SimpleNode) node.jjtGetChild(i);
126
127 /*
128 * if a block, just execute
129 */
130
131 if (child.getType() == ParserTreeConstants.JJTBLOCK)
132 {
133 child.render(context, writer);
134 break;
135 }
136 else
137 {
138 /* save the values - for now, just w/ ref to test */
139
140 if (child.getType() == ParserTreeConstants.JJTREFERENCE)
141 {
142 data.put(child, child.execute(null, context));
143 }
144 else
145 {
146 System.out.println("unhandled type");
147 }
148 }
149 }
150
151 Iterator it = data.keySet().iterator();
152
153 while(it.hasNext())
154 {
155 ASTReference ref = (ASTReference) it.next();
156
157 ref.setValue(context, data.get(ref));
158 }
159
160 return true;
161 }
162 }