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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  /*** The otherwise block of a choose/when/otherwise group of tags
    23    *
    24    * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
    25    * @version $Revision: 155420 $
    26    */
    27  public class OtherwiseTag extends TagSupport {
    28
    29      public OtherwiseTag() {
    30      }
    31
    32      // Tag interface
    33      //-------------------------------------------------------------------------
    34      public void doTag(XMLOutput output) throws JellyTagException {
    35          ChooseTag tag = (ChooseTag) findAncestorWithClass( ChooseTag.class );
    36          if ( tag == null ) {
    37              throw new JellyTagException( "This tag must be enclosed inside a <choose> tag" );
    38          }
    39          if ( ! tag.isBlockEvaluated() ) {
    40              tag.setBlockEvaluated(true);
    41              invokeBody(output);
    42          }
    43      }
    44  }