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 org.apache.beam.sdk.values.KV;
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  import org.hamcrest.TypeSafeMatcher;
  
  public class KvMatcher<K, V> extends TypeSafeMatcher<KV<? extends K, ? extends V>> {
  
    private final Matcher<? super K> keyMatcher;
    private final Matcher<? super V> valueMatcher;
  
    public KvMatcher(Matcher<? super K> keyMatcher,
        Matcher<? super V> valueMatcher) {
      this.keyMatcher = keyMatcher;
      this.valueMatcher = valueMatcher;
    }
  
    public static <K, V> KvMatcher<K, V> isKv(Matcher<K> keyMatcher,
        Matcher<V> valueMatcher) {
      return new KvMatcher<>(keyMatcher, valueMatcher);
    }
  
    @Override
    public boolean matchesSafely(KV<? extends K, ? extends V> kv) {
      return keyMatcher.matches(kv.getKey())
          && valueMatcher.matches(kv.getValue());
    }
  
    @Override
    public void describeTo(Description description) {
      description
          .appendText("a KV(").appendValue(keyMatcher)
          .appendText(", ").appendValue(valueMatcher)
          .appendText(")");
    }
  
  }
  