RegexValidatorTag.java

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package com.sun.faces.taglib.jsf_core;

import javax.faces.validator.RegexValidator;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.el.ValueExpression;
import javax.el.ExpressionFactory;
import javax.servlet.jsp.JspException;


/**
 * Tag for the Regular Expression Validator.  Can accept a regex pattern as a
 * property - this will be used to validate against.
 * @author driscoll
 */
public class RegexValidatorTag extends AbstractValidatorTag {

    private static final long serialVersionUID = 5353063400995625645L;
    private ValueExpression regex;
    private ValueExpression VALIDATOR_ID_EXPR;

    // ------------------------------------------------------------ Constructors


    public RegexValidatorTag() {
        if (VALIDATOR_ID_EXPR == null) {
            FacesContext context = FacesContext.getCurrentInstance();
            ExpressionFactory factory =
                context.getApplication().getExpressionFactory();
            VALIDATOR_ID_EXPR =
                factory.createValueExpression(context.getELContext(),
                    "javax.faces.RegularExpression",String.class);
        }
    }

    /**
     * Set the Regular Expression to use for validation.
     * @param pattern A regular expression - needs to be escaped, @see java.util.regex .
     */
    public void setPattern(ValueExpression pattern) {
        this.regex = pattern;
    }

    @Override
    protected Validator createValidator() throws JspException {
        super.setValidatorId(VALIDATOR_ID_EXPR);
        RegexValidator validator = (RegexValidator) super.createValidator();
        assert (validator != null);
        if (regex != null) {
            FacesContext ctx = FacesContext.getCurrentInstance();
            validator.setPattern((String) regex.getValue(ctx.getELContext()));
        }
        return validator;
        
    }
}