/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * The MIT License
 *
 * Copyright (c) 2004-2015 Paul R. Holser, Jr.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package jdk.internal.joptsimple.util;

import java.util.Locale;
import java.util.regex.Pattern;

import static java.util.regex.Pattern.*;
import static jdk.internal.joptsimple.internal.Messages.message;

import jdk.internal.joptsimple.ValueConversionException;
import jdk.internal.joptsimple.ValueConverter;

/**
 * Ensures that values entirely match a regular expression.
 *
 * @author <a href="mailto:pholser@alumni.rice.edu">Paul Holser</a>
 */
public class RegexMatcher implements ValueConverter<String> {
    private final Pattern pattern;

    /**
     * Creates a matcher that uses the given regular expression, modified by the given flags.
     *
     * @param pattern the regular expression pattern
     * @param flags modifying regex flags
     * @throws IllegalArgumentException if bit values other than those corresponding to the defined match flags are
     * set in {@code flags}
     * @throws java.util.regex.PatternSyntaxException if the expression's syntax is invalid
     */
    public RegexMatcher( String pattern, int flags ) {
        this.pattern = compile( pattern, flags );
    }

    /**
     * Gives a matcher that uses the given regular expression.
     *
     * @param pattern the regular expression pattern
     * @return the new converter
     * @throws java.util.regex.PatternSyntaxException if the expression's syntax is invalid
     */
    public static ValueConverter<String> regex( String pattern ) {
        return new RegexMatcher( pattern, 0 );
    }

    public String convert( String value ) {
        if ( !pattern.matcher( value ).matches() ) {
            raiseValueConversionFailure( value );
        }

        return value;
    }

    public Class<String> valueType() {
        return String.class;
    }

    public String valuePattern() {
        return pattern.pattern();
    }

    private void raiseValueConversionFailure( String value ) {
        String message = message(
            Locale.getDefault(),
            "jdk.internal.joptsimple.ExceptionMessages",
            RegexMatcher.class,
            "message",
            value,
            pattern.pattern() );
        throw new ValueConversionException( message );
    }
}
