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><put></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 }