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