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/*
 * DomUI Java User Interface - shared code
 * Copyright (c) 2010 by Frits Jalvingh, Itris B.V.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * See the "sponsors" file for a list of supporters.
 *
 * The latest version of DomUI and related code, support and documentation
 * can be found at http://www.domui.org/
 * The contact for the project is Frits Jalvingh .
 */
package javax.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.regex.Pattern;
import java.util.regex.PatternSyntaxException;

import javax.annotation.meta.TypeQualifierNickname;
import javax.annotation.meta.TypeQualifierValidator;
import javax.annotation.meta.When;

/**
 * This qualifier is used to denote String values that should be a Regular
 * expression.
 *
 */
@Documented
@Syntax("RegEx")
@TypeQualifierNickname
@Retention(RetentionPolicy.RUNTIME)
public @interface RegEx {
    When when() default When.ALWAYS;

    static class Checker implements TypeQualifierValidator {

        public When forConstantValue(RegEx annotation, Object value) {
            if (!(value instanceof String))
                return When.NEVER;

            try {
                Pattern.compile((String) value);
            } catch (PatternSyntaxException e) {
                return When.NEVER;
            }
            return When.ALWAYS;

        }

    }

}