/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.intentresolver;

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

/**
 * Utils for helping with more customized matching options, for example matching the first
 * occurrence of a set criteria.
 */
public class MatcherUtils {

    /**
     * Returns a {@link Matcher} which only matches the first occurrence of a set criteria.
     */
    public static <T> Matcher<T> first(final Matcher<T> matcher) {
        return new BaseMatcher<T>() {
            boolean isFirstMatch = true;

            @Override
            public boolean matches(final Object item) {
                if (isFirstMatch && matcher.matches(item)) {
                    isFirstMatch = false;
                    return true;
                }
                return false;
            }

            @Override
            public void describeTo(final Description description) {
                description.appendText("Returns the first matching item");
            }
        };
    }
}