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1   /*
2    * Copyright 2002,2004 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  package org.apache.commons.jelly.tags.core;
17  
18  import org.apache.commons.jelly.JellyTagException;
19  import org.apache.commons.jelly.TagSupport;
20  import org.apache.commons.jelly.XMLOutput;
21  
22  /*** A tag which conditionally evaluates its body based on some condition
23    *
24    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
25    * @version $Revision: 155420 $
26    */
27  public class ChooseTag extends TagSupport {
28  
29      private boolean blockEvaluated;
30  
31      public ChooseTag() {
32      }
33  
34      // Tag interface
35      //-------------------------------------------------------------------------
36      public void doTag(XMLOutput output) throws JellyTagException {
37          setBlockEvaluated(false);
38          invokeBody(output);
39      }
40  
41      protected boolean isBlockEvaluated() {
42          return blockEvaluated;
43      }
44  
45      protected void setBlockEvaluated(boolean blockEvaluated) {
46          this.blockEvaluated = blockEvaluated;
47      }
48  }