1 package org.apache.maven.jelly.tags;
2
3 /* ====================================================================
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ====================================================================
19 */
20
21 import org.apache.commons.jelly.MissingAttributeException;
22 import org.apache.commons.jelly.TagSupport;
23 import org.apache.maven.jelly.MavenJellyContext;
24
25 /**
26 * A class for Maven Jelly tags
27 */
28 public abstract class BaseTagSupport
29 extends TagSupport
30 {
31 /**
32 * Create an instance
33 */
34 public BaseTagSupport()
35 {
36 super();
37 }
38
39 /**
40 * @return the maven context (used to retrieve variables)
41 */
42 public MavenJellyContext getMavenContext()
43 {
44 return (MavenJellyContext) getContext();
45 }
46
47 /**
48 * Check a given 'attribute' has a value and throw the corresponding
49 * exception if it doesn't
50 *
51 * @param attribute the attribute to check
52 * @param message the message to pass in with the exception
53 * @throws MissingAttributeException when the attribute is null
54 */
55 protected void checkAttribute( Object attribute, String message )
56 throws MissingAttributeException
57 {
58 if ( attribute == null )
59 {
60 throw new MissingAttributeException( message );
61 }
62 }
63
64 }