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1 /* 2 * 3 * ==================================================================== 4 * 5 * The Apache Software License, Version 1.1 6 * 7 * Copyright (c) 1999 The Apache Software Foundation. All rights 8 * reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in 19 * the documentation and/or other materials provided with the 20 * distribution. 21 * 22 * 3. The end-user documentation included with the redistribution, if 23 * any, must include the following acknowlegement: 24 * "This product includes software developed by the 25 * Apache Software Foundation (http://www.apache.org/)." 26 * Alternately, this acknowlegement may appear in the software itself, 27 * if and wherever such third-party acknowlegements normally appear. 28 * 29 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software 30 * Foundation" must not be used to endorse or promote products derived 31 * from this software without prior written permission. For written 32 * permission, please contact apache@apache.org. 33 * 34 * 5. Products derived from this software may not be called "Apache" 35 * nor may "Apache" appear in their names without prior written 36 * permission of the Apache Group. 37 * 38 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED 39 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 40 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 41 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR 42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 44 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 45 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 46 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 47 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 48 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 49 * SUCH DAMAGE. 50 * ==================================================================== 51 * 52 * This software consists of voluntary contributions made by many 53 * individuals on behalf of the Apache Software Foundation. For more 54 * information on the Apache Software Foundation, please see 55 * <http://www.apache.org/>;. 56 * 57 */ 58 package org.apache.commons.jelly.tags.jsl; 59 60 import org.apache.commons.jelly.JellyContext; 61 import org.apache.commons.jelly.MissingAttributeException; 62 import org.apache.commons.jelly.XMLOutput; 63 import org.apache.commons.jelly.tags.xml.XPathTagSupport; 64 65 import org.apache.commons.logging.Log; 66 import org.apache.commons.logging.LogFactory; 67 68 import org.dom4j.rule.Stylesheet; 69 70 import org.jaxen.XPath; 71 72 /*** 73 * This tag performs a JSL stylesheet which was previously 74 * created via an <stylesheet> tag. 75 * 76 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a> 77 * @version $Revision: 1.8 $ 78 */ 79 public class StyleTag extends XPathTagSupport { 80 81 /*** The Log to which logging calls will be made. */ 82 private Log log = LogFactory.getLog(StyleTag.class); 83 84 85 /*** Holds the stylesheet which will be applied to the source context. */ 86 private Stylesheet stylesheet; 87 88 /*** The XPath expression to evaluate. */ 89 private XPath select; 90 91 public StyleTag() { 92 } 93 94 // Tag interface 95 //------------------------------------------------------------------------- 96 public void doTag(XMLOutput output) throws Exception { 97 Stylesheet stylesheet = getStylesheet(); 98 if (stylesheet == null) { 99 throw new MissingAttributeException("stylesheet"); 100 } 101 102 Object source = getSource(); 103 if (log.isDebugEnabled()) { 104 log.debug("About to evaluate stylesheet on source: " + source); 105 } 106 107 stylesheet.run(source); 108 } 109 110 111 // Properties 112 //------------------------------------------------------------------------- 113 114 public Stylesheet getStylesheet() { 115 return stylesheet; 116 } 117 118 /*** 119 * Sets the stylesheet to use to style this tags body 120 */ 121 public void setStylesheet(Stylesheet stylesheet) { 122 this.stylesheet = stylesheet; 123 } 124 125 /*** Sets the XPath expression to evaluate. */ 126 public void setSelect(XPath select) { 127 this.select = select; 128 } 129 130 // Implementation methods 131 //------------------------------------------------------------------------- 132 133 /*** @return the source on which the stylesheet should run 134 */ 135 protected Object getSource() throws Exception { 136 Object source = getXPathContext(); 137 if ( select != null ) { 138 return select.evaluate(source); 139 } 140 return source; 141 } 142 }

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