001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * Portions Copyright Apache Software Foundation.
007: *
008: * The contents of this file are subject to the terms of either the GNU
009: * General Public License Version 2 only ("GPL") or the Common Development
010: * and Distribution License("CDDL") (collectively, the "License"). You
011: * may not use this file except in compliance with the License. You can obtain
012: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
013: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
014: * language governing permissions and limitations under the License.
015: *
016: * When distributing the software, include this License Header Notice in each
017: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
018: * Sun designates this particular file as subject to the "Classpath" exception
019: * as provided by Sun in the GPL Version 2 section of the License file that
020: * accompanied this code. If applicable, add the following below the License
021: * Header, with the fields enclosed by brackets [] replaced by your own
022: * identifying information: "Portions Copyrighted [year]
023: * [name of copyright owner]"
024: *
025: * Contributor(s):
026: *
027: * If you wish your version of this file to be governed by only the CDDL or
028: * only the GPL Version 2, indicate your decision by adding "[Contributor]
029: * elects to include this software in this distribution under the [CDDL or GPL
030: * Version 2] license." If you don't indicate a single choice of license, a
031: * recipient has the option to distribute your version of this file under
032: * either the CDDL, the GPL Version 2 or to extend the choice of license to
033: * its licensees as provided above. However, if you add GPL Version 2 code
034: * and therefore, elected the GPL Version 2 license, then the option applies
035: * only if the new code is made subject to such option by the copyright
036: * holder.
037: */
038:
039: package org.apache.taglibs.standard.tag.common.xml;
040:
041: import javax.servlet.jsp.JspException;
042: import javax.servlet.jsp.JspTagException;
043: import javax.servlet.jsp.tagext.TagSupport;
044:
045: /**
046: * <p>Tag handler for <expr> in JSTL's XML library.</p>
047: *
048: * @author Shawn Bayern
049: */
050:
051: public abstract class ExprSupport extends TagSupport {
052:
053: //*********************************************************************
054: // Internal state
055:
056: private String select; // tag attribute
057: protected boolean escapeXml; // tag attribute
058:
059: //*********************************************************************
060: // Construction and initialization
061:
062: /**
063: * Constructs a new handler. As with TagSupport, subclasses should
064: * not provide other constructors and are expected to call the
065: * superclass constructor.
066: */
067: public ExprSupport() {
068: super ();
069: init();
070: }
071:
072: // resets local state
073: private void init() {
074: select = null;
075: escapeXml = true;
076: }
077:
078: //*********************************************************************
079: // Tag logic
080:
081: // applies XPath expression from 'select' and prints the result
082: public int doStartTag() throws JspException {
083: try {
084: XPathUtil xu = new XPathUtil(pageContext);
085: String result = xu.valueOf(XPathUtil.getContext(this ),
086: select);
087: org.apache.taglibs.standard.tag.common.core.OutSupport.out(
088: pageContext, escapeXml, result);
089: return SKIP_BODY;
090: } catch (java.io.IOException ex) {
091: throw new JspTagException(ex.toString(), ex);
092: }
093: }
094:
095: // Releases any resources we may have (or inherit)
096: public void release() {
097: super .release();
098: init();
099: }
100:
101: //*********************************************************************
102: // Attribute accessors
103:
104: public void setSelect(String select) {
105: this.select = select;
106: }
107: }
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