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.sdk.testing;
  
  import static org.apache.beam.sdk.util.Preconditions.checkStateNotNull;
  import static org.hamcrest.Matchers.is;
  
  import com.fasterxml.jackson.core.type.TypeReference;
  import com.fasterxml.jackson.databind.ObjectMapper;
  import java.io.IOException;
  import java.util.Map;
  import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
  import org.hamcrest.Description;
  import org.hamcrest.Matcher;
  import org.hamcrest.TypeSafeMatcher;
  
  /**
   * Matcher to compare a string or byte[] representing a JSON Object, independent of field order.
   *
   * <pre>
   *   assertThat("{\"name\": \"person\", \"height\": 80}",
   *              jsonStringLike("{\"height\": 80, \"name\": \"person\"}"));
   * </pre>
   */
  public abstract class JsonMatcher<T> extends TypeSafeMatcher<T> {
    private final Matcher<Map<String, Object>> mapMatcher;
    private static final ObjectMapper MAPPER = new ObjectMapper();
    private @MonotonicNonNull Map<String, Object> actualMap;
  
    public JsonMatcher(Map<String, Object> expectedMap) {
      this.mapMatcher = is(expectedMap);
    }
  
    protected abstract Map<String, Object> parse(T json) throws IOException;
  
    public static Matcher<byte[]> jsonBytesLike(String json) throws IOException {
      Map<String, Object> fields =
          MAPPER.readValue(json, new TypeReference<Map<String, Object>>() {});
      return jsonBytesLike(fields);
    }
  
    public static Matcher<byte[]> jsonBytesLike(Map<String, Object> fields) throws IOException {
      return new JsonMatcher<byte[]>(fields) {
        @Override
        protected Map<String, Object> parse(byte[] json) throws IOException {
          return MAPPER.readValue(json, new TypeReference<Map<String, Object>>() {});
        }
      };
    }
  
    public static Matcher<String> jsonStringLike(String json) throws IOException {
      Map<String, Object> fields =
          MAPPER.readValue(json, new TypeReference<Map<String, Object>>() {});
      return jsonStringLike(fields);
    }
  
    public static Matcher<String> jsonStringLike(Map<String, Object> fields) throws IOException {
      return new JsonMatcher<String>(fields) {
        @Override
        protected Map<String, Object> parse(String json) throws IOException {
          return MAPPER.readValue(json, new TypeReference<Map<String, Object>>() {});
        }
      };
    }
  
    @Override
    protected boolean matchesSafely(T actual) {
      try {
        actualMap = parse(actual);
      } catch (IOException e) {
        return false;
      }
      return mapMatcher.matches(checkStateNotNull(actualMap));
    }
  
    @Override
    public void describeTo(Description description) {
      mapMatcher.describeTo(description);
    }
  
    @Override
    protected void describeMismatchSafely(T item, Description mismatchDescription) {
      mapMatcher.describeMismatch(checkStateNotNull(actualMap), mismatchDescription);
    }
  }
  