View Javadoc
1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/core/CatchTag.java,v 1.5 2002/05/17 15:18:08 jstrachan Exp $ 3 * $Revision: 1.5 $ 4 * $Date: 2002/05/17 15:18:08 $ 5 * 6 * ==================================================================== 7 * 8 * The Apache Software License, Version 1.1 9 * 10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights 11 * reserved. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in 22 * the documentation and/or other materials provided with the 23 * distribution. 24 * 25 * 3. The end-user documentation included with the redistribution, if 26 * any, must include the following acknowlegement: 27 * "This product includes software developed by the 28 * Apache Software Foundation (http://www.apache.org/)." 29 * Alternately, this acknowlegement may appear in the software itself, 30 * if and wherever such third-party acknowlegements normally appear. 31 * 32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software 33 * Foundation" must not be used to endorse or promote products derived 34 * from this software without prior written permission. For written 35 * permission, please contact apache@apache.org. 36 * 37 * 5. Products derived from this software may not be called "Apache" 38 * nor may "Apache" appear in their names without prior written 39 * permission of the Apache Group. 40 * 41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 52 * SUCH DAMAGE. 53 * ==================================================================== 54 * 55 * This software consists of voluntary contributions made by many 56 * individuals on behalf of the Apache Software Foundation. For more 57 * information on the Apache Software Foundation, please see 58 * <http://www.apache.org/>;. 59 * 60 * $Id: CatchTag.java,v 1.5 2002/05/17 15:18:08 jstrachan Exp $ 61 */ 62 package org.apache.commons.jelly.tags.core; 63 64 import org.apache.commons.jelly.JellyContext; 65 import org.apache.commons.jelly.TagSupport; 66 import org.apache.commons.jelly.XMLOutput; 67 68 /*** 69 * A tag which catches exceptions thrown by its body. 70 * This allows conditional logic to be performed based on if exceptions 71 * are thrown or to do some kind of custom exception logging logic. 72 * 73 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 74 * @version $Revision: 1.5 $ 75 */ 76 public class CatchTag extends TagSupport { 77 78 private String var; 79 80 public CatchTag() { 81 } 82 83 // Tag interface 84 //------------------------------------------------------------------------- 85 public void doTag(XMLOutput output) throws Exception { 86 if (var != null) { 87 context.removeVariable(var); 88 } 89 try { 90 invokeBody(output); 91 } 92 catch (Throwable t) { 93 if (var != null) { 94 context.setVariable(var, t); 95 } 96 } 97 } 98 99 // Properties 100 //------------------------------------------------------------------------- 101 102 /*** 103 * Sets the name of the variable which is exposed with the Exception that gets 104 * thrown by evaluating the body of this tag or which is set to null if there is 105 * no exception thrown. 106 */ 107 public void setVar(String var) { 108 this.var = var; 109 } 110 }

This page was automatically generated by Maven