info.gehrels.voting.OptionalMatchers.java Source code

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Here is the source code for info.gehrels.voting.OptionalMatchers.java

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/*
 * Copyright  2014 Benjamin Gehrels
 *
 * This file is part of The Single Transferable Vote Elections Library.
 *
 * The Single Transferable Vote Elections Web Interface is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * The Single Transferable Vote Elections Web Interface 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
 * Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License along with The Single Transferable Vote
 * Elections Web Interface. If not, see <http://www.gnu.org/licenses/>.
 */
package info.gehrels.voting;

import com.google.common.base.Optional;
import org.hamcrest.Description;
import org.hamcrest.Matcher;
import org.hamcrest.TypeSafeDiagnosingMatcher;

public final class OptionalMatchers {
    public static Matcher<Optional<?>> anAbsentOptional() {
        return new TypeSafeDiagnosingMatcher<Optional<?>>() {
            @Override
            protected boolean matchesSafely(Optional<?> item, Description mismatchDescription) {
                if (item.isPresent()) {
                    mismatchDescription.appendText("an Optional whose value was ").appendValue(item.get());
                    return false;
                }

                return true;
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("an absent Optional");
            }
        };
    }

    public static <T> Matcher<Optional<T>> anOptionalWhoseValue(Matcher<? super T> valueMatcher) {
        return new TypeSafeDiagnosingMatcher<Optional<T>>() {
            @Override
            protected boolean matchesSafely(Optional<T> optional, Description mismatchDescription) {
                if (!optional.isPresent()) {
                    mismatchDescription.appendText("an absent Optional");
                    return false;
                }

                T value = optional.get();
                if (!valueMatcher.matches(value)) {
                    mismatchDescription.appendText("an Optional whose value ");
                    valueMatcher.describeMismatch(value, mismatchDescription);
                    return false;
                }

                return true;
            }

            @Override
            public void describeTo(Description description) {
                description.appendText("an Optional whose value ").appendDescriptionOf(valueMatcher);
            }
        };
    }
}