1 /*
2 * Copyright 2003-2004 The Apache Software Foundation.
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package org.apache.velocity.tools.generic.directive;
18
19 import java.io.IOException;
20 import java.io.Writer;
21
22 import org.apache.velocity.context.InternalContextAdapter;
23 import org.apache.velocity.exception.MethodInvocationException;
24 import org.apache.velocity.exception.ParseErrorException;
25 import org.apache.velocity.exception.ResourceNotFoundException;
26 import org.apache.velocity.runtime.directive.Directive;
27 import org.apache.velocity.runtime.parser.node.Node;
28
29 /***
30 * @author <a href="mailto:shinobu@ieee.org">Shinobu Kawai</a>
31 * @version $Id: $
32 */
33 public class Ifnotnull extends Directive {
34
35 /* (non-Javadoc)
36 * @see org.apache.velocity.runtime.directive.Directive#getName()
37 */
38 public String getName()
39 {
40 return "ifnotnull";
41 }
42
43 /* (non-Javadoc)
44 * @see org.apache.velocity.runtime.directive.Directive#getType()
45 */
46 public int getType()
47 {
48 return BLOCK;
49 }
50
51 /* (non-Javadoc)
52 * @see org.apache.velocity.runtime.directive.Directive#render(org.apache.velocity.context.InternalContextAdapter, java.io.Writer, org.apache.velocity.runtime.parser.node.Node)
53 */
54 public boolean render(InternalContextAdapter context, Writer writer,
55 Node node) throws IOException, ResourceNotFoundException,
56 ParseErrorException, MethodInvocationException
57 {
58 Object value = node.jjtGetChild(0).value(context);
59 if (value != null)
60 {
61 Node content = node.jjtGetChild(1);
62 content.render(context, writer);
63 }
64 return true;
65 }
66
67 }