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Testing utilities for LensKit.

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/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2016 LensKit Contributors.  See CONTRIBUTORS.md.
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program 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 program 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 for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.grouplens.lenskit.util.test;

import org.hamcrest.BaseMatcher;
import org.hamcrest.Description;
import org.hamcrest.Matcher;

import java.util.regex.Pattern;

/**
 * Hamcrest matcher that matches strings against patterns.
 */
public class RegexMatcher extends BaseMatcher {
    private final Pattern pattern;

    public RegexMatcher(Pattern pat) {
        pattern = pat;
    }

    @Override
    public boolean matches(Object o) {
        return o instanceof CharSequence && pattern.matcher((CharSequence) o).matches();
    }

    @Override
    public void describeTo(Description description) {
        description.appendText("string matching /" + pattern + "/");
    }
}