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    1   /*
    2    * $Id: AddTag.java 471754 2006-11-06 14:55:09Z husted $
    3    *
    4    * Licensed to the Apache Software Foundation (ASF) under one
    5    * or more contributor license agreements.  See the NOTICE file
    6    * distributed with this work for additional information
    7    * regarding copyright ownership.  The ASF licenses this file
    8    * to you under the Apache License, Version 2.0 (the
    9    * "License"); you may not use this file except in compliance
    10   * with the License.  You may obtain a copy of the License at
    11   *
    12   *  http://www.apache.org/licenses/LICENSE-2.0
    13   *
    14   * Unless required by applicable law or agreed to in writing,
    15   * software distributed under the License is distributed on an
    16   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    17   * KIND, either express or implied.  See the License for the
    18   * specific language governing permissions and limitations
    19   * under the License.
    20   */
    21
    22
    23  package org.apache.struts.tiles.taglib;
    24
    25  import javax.servlet.jsp.JspException;
    26
    27    /**
    28     * Add an element to the surrounding list tag.
    29     * Same syntax as <code>&lt;put&gt;</code>.
    30     */
    31  public class AddTag extends PutTag {
    32
    33    /**
    34     * default constructor
    35     */
    36    public AddTag() {
    37      super();
    38    }
    39
    40      /**
    41       * Call parent tag which must implement AttributeContainer.
    42       * @throws JspException If we can't find an appropriate enclosing tag.
    43       */
    44    protected void callParent() throws JspException
    45      {
    46              // Get enclosing parent
    47      AddTagParent enclosingParent = findEnclosingPutListTagParent();
    48      enclosingParent.processNestedTag( this );
    49      }
    50
    51      /**
    52       * Find parent tag which must implement AttributeContainer.
    53       * @throws JspException If we can't find an appropriate enclosing tag.
    54       */
    55    protected AddTagParent findEnclosingPutListTagParent() throws JspException {
    56      try
    57        {
    58        AddTagParent parent = (AddTagParent)findAncestorWithClass(this,AddTagParent.class);
    59        if( parent == null )
    60          {
    61          throw new JspException( "Error - tag add : enclosing tag doesn't accept 'add' tag." );
    62          }
    63        return parent;
    64        }
    65       catch( ClassCastException ex )
    66        {
    67        throw new JspException( "Error - tag add : enclosing tag doesn't accept 'add' tag." , ex);
    68        }
    69    }
    70  }