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]
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024: *
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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.el.fmt;
040:
041: import javax.servlet.jsp.JspException;
042:
043: import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
044: import org.apache.taglibs.standard.tag.common.fmt.BundleSupport;
045:
046: /**
047: * <p>A handler for <bundle> that accepts attributes as Strings
048: * and evaluates them as expressions at runtime.</p>
049: *
050: * @author Shawn Bayern
051: * @author Jan Luehe
052: */
053:
054: public class BundleTag extends BundleSupport {
055:
056: //*********************************************************************
057: // 'Private' state (implementation details)
058:
059: private String basename_; // stores EL-based property
060: private String prefix_; // stores EL-based property
061:
062: //*********************************************************************
063: // Constructor
064:
065: /**
066: * Constructs a new BundleTag. As with TagSupport, subclasses
067: * should not provide other constructors and are expected to call
068: * the superclass constructor
069: */
070: public BundleTag() {
071: super ();
072: init();
073: }
074:
075: //*********************************************************************
076: // Tag logic
077:
078: // evaluates expression and chains to parent
079: public int doStartTag() throws JspException {
080:
081: // evaluate any expressions we were passed, once per invocation
082: evaluateExpressions();
083:
084: // chain to the parent implementation
085: return super .doStartTag();
086: }
087:
088: // Releases any resources we may have (or inherit)
089: public void release() {
090: super .release();
091: init();
092: }
093:
094: //*********************************************************************
095: // Accessor methods
096:
097: // for EL-based attribute
098: public void setBasename(String basename_) {
099: this .basename_ = basename_;
100: }
101:
102: // for EL-based attribute
103: public void setPrefix(String prefix_) {
104: this .prefix_ = prefix_;
105: }
106:
107: //*********************************************************************
108: // Private (utility) methods
109:
110: // (re)initializes state (during release() or construction)
111: private void init() {
112: // null implies "no expression"
113: basename_ = prefix_ = null;
114: }
115:
116: // Evaluates expressions as necessary
117: private void evaluateExpressions() throws JspException {
118:
119: // 'basename' attribute (mandatory)
120: basename = (String) ExpressionEvaluatorManager.evaluate(
121: "basename", basename_, String.class, this , pageContext);
122:
123: // 'prefix' attribute (optional)
124: if (prefix_ != null) {
125: prefix = (String) ExpressionEvaluatorManager.evaluate(
126: "prefix", prefix_, String.class, this, pageContext);
127: }
128: }
129: }
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