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Testing utilities for LensKit.

There is a newer version: 3.0-T5

/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2014 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;

/**
 * Matcher for {@link Double#NaN}.
 */
class NotANumberMatcher extends BaseMatcher {

    @Override
    public boolean matches(Object item) {
        if (item instanceof Double) {
            return ((Double) item).isNaN();
        } else {
            return false;
        }
    }

    @Override
    public void describeTo(Description description) {
        description.appendText("NaN");
    }
}