org.apache.taglibs.standard.tag.el.fmt.SetTimeZoneTag Maven / Gradle / Ivy
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/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
* own identifying information: Portions Copyright [yyyy]
* [name of copyright owner]
*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
*
* Portions Copyright Apache Software Foundation.
*/
package org.apache.taglibs.standard.tag.el.fmt;
import javax.servlet.jsp.JspException;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.apache.taglibs.standard.tag.common.fmt.SetTimeZoneSupport;
/**
* A handler for <setTimeZone> that accepts attributes as Strings
* and evaluates them as expressions at runtime.
*
* @author Shawn Bayern
* @author Jan Luehe
*/
public class SetTimeZoneTag extends SetTimeZoneSupport {
//*********************************************************************
// 'Private' state (implementation details)
private String value_; // stores EL-based property
//*********************************************************************
// Constructor
/**
* Constructs a new TimeZoneTag. As with TagSupport, subclasses
* should not provide other constructors and are expected to call
* the superclass constructor
*/
public SetTimeZoneTag() {
super();
init();
}
//*********************************************************************
// Tag logic
// evaluates expression and chains to parent
public int doStartTag() throws JspException {
// evaluate any expressions we were passed, once per invocation
evaluateExpressions();
// chain to the parent implementation
return super.doStartTag();
}
// Releases any resources we may have (or inherit)
public void release() {
super.release();
init();
}
//*********************************************************************
// Accessor methods
// for EL-based attribute
public void setValue(String value_) {
this.value_ = value_;
}
//*********************************************************************
// Private (utility) methods
// (re)initializes state (during release() or construction)
private void init() {
// null implies "no expression"
value_ = null;
}
// Evaluates expressions as necessary
private void evaluateExpressions() throws JspException {
// 'value' attribute (mandatory)
value = ExpressionEvaluatorManager.evaluate(
"value", value_, Object.class, this, pageContext);
}
}