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// ValidateDoubleRangeTag.java
package com.sun.faces.taglib.jsf_core;
import javax.el.ELContext;
import javax.el.ValueExpression;
import javax.el.ExpressionFactory;
import javax.faces.context.FacesContext;
import javax.faces.validator.DoubleRangeValidator;
import javax.faces.validator.Validator;
import javax.servlet.jsp.JspException;
import com.sun.faces.el.ELUtils;
/**
* ValidateDoubleRangeTag is the tag handler class for
* <code>validate_doublerange</code> tag.
*/
public class ValidateDoubleRangeTag extends MaxMinValidatorTag {
private static final long serialVersionUID = 1677210040390032609L;
private static ValueExpression VALIDATOR_ID_EXPR = null;
//
// Instance Variables
//
// Attribute Instance Variables
protected ValueExpression maximumExpression = null;
protected ValueExpression minimumExpression = null;
protected double maximum = 0;
protected double minimum = 0;
// Relationship Instance Variables
//
// Constructors and Initializers
//
public ValidateDoubleRangeTag() {
super();
if (VALIDATOR_ID_EXPR == null) {
FacesContext context = FacesContext.getCurrentInstance();
ExpressionFactory factory =
context.getApplication().getExpressionFactory();
VALIDATOR_ID_EXPR =
factory.createValueExpression(context.getELContext(),
"javax.faces.DoubleRange",String.class);
}
}
//
// Class methods
//
//
// General Methods
//
public void setMaximum(ValueExpression newMaximum) {
maximumSet = true;
maximumExpression = newMaximum;
}
public void setMinimum(ValueExpression newMinimum) {
minimumSet = true;
minimumExpression = newMinimum;
}
public int doStartTag() throws JspException {
super.setValidatorId(VALIDATOR_ID_EXPR);
return super.doStartTag();
}
//
// Methods from ValidatorTag
//
protected Validator createValidator() throws JspException {
DoubleRangeValidator result = (DoubleRangeValidator)
super.createValidator();
assert (null != result);
evaluateExpressions();
if (maximumSet) {
result.setMaximum(maximum);
}
if (minimumSet) {
result.setMinimum(minimum);
}
return result;
}
/* Evaluates expressions as necessary */
private void evaluateExpressions() {
ELContext context = FacesContext.getCurrentInstance().getELContext();
if (minimumExpression != null) {
if (!minimumExpression.isLiteralText()) {
minimum = ((Number)
ELUtils.evaluateValueExpression(minimumExpression,
context)).doubleValue();
} else {
minimum =
Double.valueOf(minimumExpression.getExpressionString()).
doubleValue();
}
}
if (maximumExpression != null) {
if (!maximumExpression.isLiteralText()) {
maximum = ((Number)
ELUtils.evaluateValueExpression(maximumExpression,
context)).doubleValue();
} else {
maximum =
Double.valueOf(maximumExpression.getExpressionString()).
doubleValue();
}
}
}
} // end of class ValidateDoubleRangeTag