/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.ignite.internal.processors.query.calcite;

import java.util.Collection;
import org.hamcrest.CustomMatcher;
import org.hamcrest.Matcher;

/**
 *  Test utils.
 */
public class TestUtils {
    /**
     * Matcher to verify size of the collection.
     *
     * @param size Required size.
     * @return {@code true} in case collection is not null and has an exactly the same size.
     */
    public static <T extends Collection<?>> Matcher<T> hasSize(int size) {
        return new CustomMatcher<T>("should be non empty with size=" + size) {
            @Override public boolean matches(Object item) {
                return item instanceof Collection && ((Collection<?>)item).size() == size;
            }
        };
    }
}
