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.el.fmt;
040:
041: import java.util.Date;
042:
043: import javax.servlet.jsp.JspException;
044:
045: import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
046: import org.apache.taglibs.standard.tag.common.fmt.FormatDateSupport;
047:
048: /**
049: * <p>A handler for <formatDate> that accepts attributes as Strings
050: * and evaluates them as expressions at runtime.</p>
051: *
052: * @author Jan Luehe
053: */
054:
055: public class FormatDateTag extends FormatDateSupport {
056:
057: //*********************************************************************
058: // 'Private' state (implementation details)
059:
060: private String value_; // stores EL-based property
061: private String type_; // stores EL-based property
062: private String dateStyle_; // stores EL-based property
063: private String timeStyle_; // stores EL-based property
064: private String pattern_; // stores EL-based property
065: private String timeZone_; // stores EL-based property
066:
067: //*********************************************************************
068: // Constructor
069:
070: /**
071: * Constructs a new FormatDateTag. As with TagSupport, subclasses
072: * should not provide other constructors and are expected to call
073: * the superclass constructor
074: */
075: public FormatDateTag() {
076: super ();
077: init();
078: }
079:
080: //*********************************************************************
081: // Tag logic
082:
083: // evaluates expression and chains to parent
084: public int doStartTag() throws JspException {
085:
086: // evaluate any expressions we were passed, once per invocation
087: evaluateExpressions();
088:
089: // chain to the parent implementation
090: return super .doStartTag();
091: }
092:
093: // Releases any resources we may have (or inherit)
094: public void release() {
095: super .release();
096: init();
097: }
098:
099: //*********************************************************************
100: // Accessor methods
101:
102: // for EL-based attribute
103: public void setValue(String value_) {
104: this .value_ = value_;
105: }
106:
107: // for EL-based attribute
108: public void setType(String type_) {
109: this .type_ = type_;
110: }
111:
112: // for EL-based attribute
113: public void setDateStyle(String dateStyle_) {
114: this .dateStyle_ = dateStyle_;
115: }
116:
117: // for EL-based attribute
118: public void setTimeStyle(String timeStyle_) {
119: this .timeStyle_ = timeStyle_;
120: }
121:
122: // for EL-based attribute
123: public void setPattern(String pattern_) {
124: this .pattern_ = pattern_;
125: }
126:
127: // for EL-based attribute
128: public void setTimeZone(String timeZone_) {
129: this .timeZone_ = timeZone_;
130: }
131:
132: //*********************************************************************
133: // Private (utility) methods
134:
135: // (re)initializes state (during release() or construction)
136: private void init() {
137: // null implies "no expression"
138: value_ = type_ = dateStyle_ = timeStyle_ = pattern_ = timeZone_ = null;
139: }
140:
141: // Evaluates expressions as necessary
142: private void evaluateExpressions() throws JspException {
143: /*
144: * Note: we don't check for type mismatches here; we assume
145: * the expression evaluator will return the expected type
146: * (by virtue of knowledge we give it about what that type is).
147: * A ClassCastException here is truly unexpected, so we let it
148: * propagate up.
149: */
150:
151: // 'value' attribute (mandatory)
152: value = (Date) ExpressionEvaluatorManager.evaluate("value",
153: value_, Date.class, this , pageContext);
154:
155: // 'type' attribute
156: if (type_ != null) {
157: type = (String) ExpressionEvaluatorManager.evaluate("type",
158: type_, String.class, this , pageContext);
159: }
160:
161: // 'dateStyle' attribute
162: if (dateStyle_ != null) {
163: dateStyle = (String) ExpressionEvaluatorManager.evaluate(
164: "dateStyle", dateStyle_, String.class, this ,
165: pageContext);
166: }
167:
168: // 'timeStyle' attribute
169: if (timeStyle_ != null) {
170: timeStyle = (String) ExpressionEvaluatorManager.evaluate(
171: "timeStyle", timeStyle_, String.class, this ,
172: pageContext);
173: }
174:
175: // 'pattern' attribute
176: if (pattern_ != null) {
177: pattern = (String) ExpressionEvaluatorManager.evaluate(
178: "pattern", pattern_, String.class, this ,
179: pageContext);
180: }
181:
182: // 'timeZone' attribute
183: if (timeZone_ != null) {
184: timeZone = ExpressionEvaluatorManager.evaluate("timeZone",
185: timeZone_, Object.class, this, pageContext);
186: }
187: }
188: }
|