com.sun.faces.taglib.jsf_core.RegexValidatorTag Maven / Gradle / Ivy

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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.2.20
/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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package com.sun.faces.taglib.jsf_core;

import javax.faces.validator.RegexValidator;
import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.validator.Validator;
import javax.faces.webapp.ValidatorELTag;
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 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;
        
    }
}