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.arrow.vector.types.pojo;
  
  import static org.apache.arrow.vector.types.pojo.Schema.METADATA_KEY;
  import static org.apache.arrow.vector.types.pojo.Schema.METADATA_VALUE;
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  import java.io.IOException;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import org.apache.arrow.vector.types.pojo.ArrowType.Int;
  import org.junit.jupiter.api.Test;
  
  public class TestField {
  
    private static Field field(
        String name, boolean nullable, ArrowType type, Map<String, String> metadata) {
      return new Field(name, new FieldType(nullable, type, null, metadata), Collections.emptyList());
    }
  
    @Test
    public void testMetadata() throws IOException {
      Map<String, String> metadata = new HashMap<>(1);
      metadata.put("testKey", "testValue");
  
      Schema schema =
          new Schema(Collections.singletonList(field("a", false, new Int(8, true), metadata)));
  
      String json = schema.toJson();
      Schema actual = Schema.fromJSON(json);
  
      jsonContains(
          json,
          "\"" + METADATA_KEY + "\" : \"testKey\"",
          "\"" + METADATA_VALUE + "\" : \"testValue\"");
  
      Map<String, String> actualMetadata = actual.getFields().get(0).getMetadata();
      assertEquals(1, actualMetadata.size());
      assertEquals("testValue", actualMetadata.get("testKey"));
    }
  
    private void jsonContains(String json, String... strings) {
      for (String string : strings) {
        assertTrue(json.contains(string), json + " contains " + string);
      }
    }
  }
  