content: /*
   * 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.beam.learning.katas.util;
  
  import static com.google.common.collect.Iterables.toArray;
  import static org.apache.beam.learning.katas.util.KvMatcher.isKv;
  import static org.hamcrest.CoreMatchers.equalTo;
  import static org.hamcrest.collection.IsIterableContainingInAnyOrder.containsInAnyOrder;
  import static org.hamcrest.MatcherAssert.assertThat;
  
  import com.google.common.collect.ImmutableList;
  import java.util.ArrayList;
  import java.util.List;
  import org.apache.beam.sdk.transforms.SerializableFunction;
  import org.apache.beam.sdk.values.KV;
  import org.hamcrest.Matcher;
  
  public class ContainsKvs implements
      SerializableFunction<Iterable<KV<String, Iterable<String>>>, Void> {
  
    private final List<KV<String, Iterable<String>>> expectedKvs;
  
    private ContainsKvs(List<KV<String, Iterable<String>>> expectedKvs) {
      this.expectedKvs = expectedKvs;
    }
  
    @SafeVarargs
    public static SerializableFunction<Iterable<KV<String, Iterable<String>>>, Void> containsKvs(
        KV<String, Iterable<String>>... kvs) {
      return new ContainsKvs(ImmutableList.copyOf(kvs));
    }
  
    @Override
    public Void apply(Iterable<KV<String, Iterable<String>>> input) {
      List<Matcher<? super KV<String, Iterable<String>>>> matchers = new ArrayList<>();
      for (KV<String, Iterable<String>> expected : expectedKvs) {
        String[] values = toArray(expected.getValue(), String.class);
        matchers.add(isKv(equalTo(expected.getKey()), containsInAnyOrder(values)));
      }
      assertThat(input, containsInAnyOrder(matchers));
      return null;
    }
  
  }
  