org.apache.taglibs.standard.tag.el.fmt.FormatNumberTag Maven / Gradle / Ivy
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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.FormatNumberSupport;
/**
* A handler for <formatNumber> that accepts attributes as Strings
* and evaluates them as expressions at runtime.
*
* @author Jan Luehe
*/
public class FormatNumberTag extends FormatNumberSupport {
//*********************************************************************
// 'Private' state (implementation details)
private String value_; // stores EL-based property
private String type_; // stores EL-based property
private String pattern_; // stores EL-based property
private String currencyCode_; // stores EL-based property
private String currencySymbol_; // stores EL-based property
private String groupingUsed_; // stores EL-based property
private String maxIntegerDigits_; // stores EL-based property
private String minIntegerDigits_; // stores EL-based property
private String maxFractionDigits_; // stores EL-based property
private String minFractionDigits_; // stores EL-based property
//*********************************************************************
// Constructor
/**
* Constructs a new FormatNumberTag. As with TagSupport, subclasses
* should not provide other constructors and are expected to call
* the superclass constructor
*/
public FormatNumberTag() {
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 setPattern(String pattern_) {
this.pattern_ = pattern_;
}
// for EL-based attribute
public void setCurrencyCode(String currencyCode_) {
this.currencyCode_ = currencyCode_;
}
// for EL-based attribute
public void setCurrencySymbol(String currencySymbol_) {
this.currencySymbol_ = currencySymbol_;
}
// for EL-based attribute
public void setGroupingUsed(String groupingUsed_) {
this.groupingUsed_ = groupingUsed_;
this.groupingUsedSpecified = true;
}
// for EL-based attribute
public void setMaxIntegerDigits(String maxIntegerDigits_) {
this.maxIntegerDigits_ = maxIntegerDigits_;
this.maxIntegerDigitsSpecified = true;
}
// for EL-based attribute
public void setMinIntegerDigits(String minIntegerDigits_) {
this.minIntegerDigits_ = minIntegerDigits_;
this.minIntegerDigitsSpecified = true;
}
// for EL-based attribute
public void setMaxFractionDigits(String maxFractionDigits_) {
this.maxFractionDigits_ = maxFractionDigits_;
this.maxFractionDigitsSpecified = true;
}
// for EL-based attribute
public void setMinFractionDigits(String minFractionDigits_) {
this.minFractionDigits_ = minFractionDigits_;
this.minFractionDigitsSpecified = true;
}
//*********************************************************************
// Private (utility) methods
// (re)initializes state (during release() or construction)
private void init() {
// null implies "no expression"
value_ = type_ = pattern_ = null;
currencyCode_ = currencySymbol_ = null;
groupingUsed_ = null;
maxIntegerDigits_ = minIntegerDigits_ = null;
maxFractionDigits_ = minFractionDigits_ = null;
}
// Evaluates expressions as necessary
private void evaluateExpressions() throws JspException {
Object obj = null;
/*
* 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 = ExpressionEvaluatorManager.evaluate(
"value", value_, Object.class, this, pageContext);
}
// 'type' attribute
if (type_ != null) {
type = (String) ExpressionEvaluatorManager.evaluate(
"type", type_, String.class, this, pageContext);
}
// 'pattern' attribute
if (pattern_ != null) {
pattern = (String) ExpressionEvaluatorManager.evaluate(
"pattern", pattern_, String.class, this, pageContext);
}
// 'currencyCode' attribute
if (currencyCode_ != null) {
currencyCode = (String) ExpressionEvaluatorManager.evaluate(
"currencyCode", currencyCode_, String.class, this,
pageContext);
}
// 'currencySymbol' attribute
if (currencySymbol_ != null) {
currencySymbol = (String) ExpressionEvaluatorManager.evaluate(
"currencySymbol", currencySymbol_, String.class, this,
pageContext);
}
// 'groupingUsed' attribute
if (groupingUsed_ != null) {
obj = ExpressionEvaluatorManager.evaluate(
"groupingUsed", groupingUsed_, Boolean.class, this,
pageContext);
if (obj != null) {
isGroupingUsed = ((Boolean) obj).booleanValue();
}
}
// 'maxIntegerDigits' attribute
if (maxIntegerDigits_ != null) {
obj = ExpressionEvaluatorManager.evaluate(
"maxIntegerDigits", maxIntegerDigits_, Integer.class, this,
pageContext);
if (obj != null) {
maxIntegerDigits = ((Integer) obj).intValue();
}
}
// 'minIntegerDigits' attribute
if (minIntegerDigits_ != null) {
obj = ExpressionEvaluatorManager.evaluate(
"minIntegerDigits", minIntegerDigits_, Integer.class, this,
pageContext);
if (obj != null) {
minIntegerDigits = ((Integer) obj).intValue();
}
}
// 'maxFractionDigits' attribute
if (maxFractionDigits_ != null) {
obj = ExpressionEvaluatorManager.evaluate(
"maxFractionDigits", maxFractionDigits_, Integer.class, this,
pageContext);
if (obj != null) {
maxFractionDigits = ((Integer) obj).intValue();
}
}
// 'minFractionDigits' attribute
if (minFractionDigits_ != null) {
obj = ExpressionEvaluatorManager.evaluate(
"minFractionDigits", minFractionDigits_, Integer.class, this,
pageContext);
if (obj != null) {
minFractionDigits = ((Integer) obj).intValue();
}
}
}
}