RegexMatcher.java

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/*
 * 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) 2004-2014 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
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 * distribute, sublicense, and/or sell copies of the Software, and to
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package jdk.internal.joptsimple.util;

import java.util.regex.Pattern;

import static java.util.regex.Pattern.*;

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() ) {
            throw new ValueConversionException(
                "Value [" + value + "] did not match regex [" + pattern.pattern() + ']' );
        }

        return value;
    }

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

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