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1 /* 2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/taglibs/beanshell/src/java/org/apache/commons/jelly/tags/beanshell/BeanShellExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $ 3 * $Revision: 1.1 $ 4 * $Date: 2002/05/21 07:58:55 $ 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: BeanShellExpressionFactory.java,v 1.1 2002/05/21 07:58:55 jstrachan Exp $ 61 */ 62 63 package org.apache.commons.jelly.tags.define; 64 65 import java.io.File; 66 import java.net.URL; 67 import java.net.URLClassLoader; 68 69 import org.apache.commons.jelly.MissingAttributeException; 70 import org.apache.commons.jelly.XMLOutput; 71 import org.apache.commons.logging.Log; 72 import org.apache.commons.logging.LogFactory; 73 74 75 /*** 76 * Creates a new <code>URLClassLoader</code> to dynamically 77 * load tags froms. 78 * 79 * @author <a href="mailto:stephenh@chase3000.com">Stephen Haberman</a> 80 * @version $Revision: 1.1 $ 81 */ 82 public class ClassLoaderTag extends BeanTag { 83 84 /*** The Log to which logging calls will be made. */ 85 private static final Log log = LogFactory.getLog(ClassLoaderTag.class); 86 87 /*** The name to export the classloader to. */ 88 private String var; 89 90 /*** The URL to load the classes from. */ 91 private String url; 92 93 // Properties 94 //------------------------------------------------------------------------- 95 96 /*** 97 * @return the variable to store the class loader in 98 */ 99 public String getVar() { 100 return this.var; 101 } 102 103 /*** 104 * @param var the variable to store the class loader in 105 */ 106 public void setVar(String var) { 107 this.var = var; 108 } 109 110 /*** 111 * @return the url to load the classes from 112 */ 113 public String getUrl() { 114 return this.url; 115 } 116 117 /*** 118 * @param url the url to load the classes from 119 */ 120 public void setUrl(String url) { 121 this.url = url; 122 } 123 124 // Implementation methods 125 //------------------------------------------------------------------------- 126 127 public void doTag(XMLOutput output) throws Exception { 128 if ( getVar() == null ) { 129 throw new MissingAttributeException( "var" ); 130 } 131 if ( getUrl() == null ) { 132 throw new MissingAttributeException( "url" ); 133 } 134 135 ClassLoader parent = Thread.currentThread().getContextClassLoader(); 136 if (parent == null) { 137 parent = getClass().getClassLoader(); 138 } 139 140 URLClassLoader newClassLoader = new URLClassLoader( 141 new URL[] { new URL(getUrl()) }, 142 parent ); 143 144 log.debug("Storing the new classloader in " + getVar()); 145 146 context.setVariable(getVar(), newClassLoader); 147 } 148 149 }

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