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package org.apache.taglibs.standard.tag.el.fmt;
import java.util.Locale;
import javax.servlet.jsp.JspException;
import org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager;
import org.apache.taglibs.standard.tag.common.fmt.ParseDateSupport;
import org.apache.taglibs.standard.tag.common.fmt.SetLocaleSupport;
/**
* A handler for <parseDate> that accepts attributes as Strings
* and evaluates them as expressions at runtime.
*
* @author Jan Luehe
*/
public class ParseDateTag extends ParseDateSupport {
//*********************************************************************
// 'Private' state (implementation details)
private String value_; // stores EL-based property
private String type_; // stores EL-based property
private String dateStyle_; // stores EL-based property
private String timeStyle_; // stores EL-based property
private String pattern_; // stores EL-based property
private String timeZone_; // stores EL-based property
private String parseLocale_; // stores EL-based property
//*********************************************************************
// Constructor
/**
* Constructs a new ParseDateTag. As with TagSupport, subclasses
* should not provide other constructors and are expected to call
* the superclass constructor
*/
public ParseDateTag() {
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_;
this.valueSpecified = true;
}
// for EL-based attribute
public void setType(String type_) {
this.type_ = type_;
}
// for EL-based attribute
public void setDateStyle(String dateStyle_) {
this.dateStyle_ = dateStyle_;
}
// for EL-based attribute
public void setTimeStyle(String timeStyle_) {
this.timeStyle_ = timeStyle_;
}
// for EL-based attribute
public void setPattern(String pattern_) {
this.pattern_ = pattern_;
}
// for EL-based attribute
public void setTimeZone(String timeZone_) {
this.timeZone_ = timeZone_;
}
// for EL-based attribute
public void setParseLocale(String parseLocale_) {
this.parseLocale_ = parseLocale_;
}
//*********************************************************************
// Private (utility) methods
// (re)initializes state (during release() or construction)
private void init() {
// null implies "no expression"
value_ = type_ = dateStyle_ = timeStyle_ = pattern_ = timeZone_ = null;
parseLocale_ = null;
}
// Evaluates expressions as necessary
private void evaluateExpressions() throws JspException {
/*
* Note: we don't check for type mismatches here; we assume
* the expression evaluator will return the expected type
* (by virtue of knowledge we give it about what that type is).
* A ClassCastException here is truly unexpected, so we let it
* propagate up.
*/
// 'value' attribute
if (value_ != null) {
value = (String) ExpressionEvaluatorManager.evaluate(
"value", value_, String.class, this, pageContext);
}
// 'type' attribute
if (type_ != null) {
type = (String) ExpressionEvaluatorManager.evaluate(
"type", type_, String.class, this, pageContext);
}
// 'dateStyle' attribute
if (dateStyle_ != null) {
dateStyle = (String) ExpressionEvaluatorManager.evaluate(
"dateStyle", dateStyle_, String.class, this, pageContext);
}
// 'timeStyle' attribute
if (timeStyle_ != null) {
timeStyle = (String) ExpressionEvaluatorManager.evaluate(
"timeStyle", timeStyle_, String.class, this, pageContext);
}
// 'pattern' attribute
if (pattern_ != null) {
pattern = (String) ExpressionEvaluatorManager.evaluate(
"pattern", pattern_, String.class, this, pageContext);
}
// 'timeZone' attribute
if (timeZone_ != null) {
timeZone = ExpressionEvaluatorManager.evaluate(
"timeZone", timeZone_, Object.class, this, pageContext);
}
// 'parseLocale' attribute
if (parseLocale_ != null) {
Object obj = ExpressionEvaluatorManager.evaluate(
"parseLocale", parseLocale_, Object.class, this, pageContext);
if (obj != null) {
if (obj instanceof Locale) {
parseLocale = (Locale) obj;
} else {
String localeStr = (String) obj;
if (!"".equals(localeStr)) {
parseLocale = SetLocaleSupport.parseLocale(localeStr);
}
}
}
}
}
}