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.kafka.connect.transforms;
  
  import org.apache.kafka.common.utils.AppInfoParser;
  import org.apache.kafka.connect.data.Schema;
  import org.apache.kafka.connect.data.SchemaBuilder;
  import org.apache.kafka.connect.data.Struct;
  import org.apache.kafka.connect.errors.DataException;
  import org.apache.kafka.connect.sink.SinkRecord;
  
  import org.junit.jupiter.api.AfterEach;
  import org.junit.jupiter.api.Test;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.Arguments;
  import org.junit.jupiter.params.provider.MethodSource;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.stream.Stream;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertNull;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  public class ValueToKeyTest {
      private final ValueToKey<SinkRecord> xform = new ValueToKey<>();
  
      public static Stream<Arguments> data() {
          return Stream.of(
                  Arguments.of(false, null),
                  Arguments.of(true, 42)
          );
      }
  
      @AfterEach
      public void teardown() {
          xform.close();
      }
  
      @Test
      public void schemaless() {
          xform.configure(Collections.singletonMap("fields", "a,b"));
  
          final HashMap<String, Integer> value = new HashMap<>();
          value.put("a", 1);
          value.put("b", 2);
          value.put("c", 3);
  
          final SinkRecord record = new SinkRecord("", 0, null, null, null, value, 0);
          final SinkRecord transformedRecord = xform.apply(record);
  
          final HashMap<String, Integer> expectedKey = new HashMap<>();
          expectedKey.put("a", 1);
          expectedKey.put("b", 2);
  
          assertNull(transformedRecord.keySchema());
          assertEquals(expectedKey, transformedRecord.key());
      }
  
      @Test
      public void withSchema() {
          xform.configure(Collections.singletonMap("fields", "a,b"));
  
          final Schema valueSchema = SchemaBuilder.struct()
                  .field("a", Schema.INT32_SCHEMA)
                  .field("b", Schema.INT32_SCHEMA)
                  .field("c", Schema.INT32_SCHEMA)
                  .build();
  
          final Struct value = new Struct(valueSchema);
          value.put("a", 1);
          value.put("b", 2);
          value.put("c", 3);
  
          final SinkRecord record = new SinkRecord("", 0, null, null, valueSchema, value, 0);
          final SinkRecord transformedRecord = xform.apply(record);
  
          final Schema expectedKeySchema = SchemaBuilder.struct()
                  .field("a", Schema.INT32_SCHEMA)
                  .field("b", Schema.INT32_SCHEMA)
                  .build();
  
          final Struct expectedKey = new Struct(expectedKeySchema)
                  .put("a", 1)
                  .put("b", 2);
  
          assertEquals(expectedKeySchema, transformedRecord.keySchema());
          assertEquals(expectedKey, transformedRecord.key());
      }
  
      @Test
      public void nonExistingField() {
          xform.configure(Collections.singletonMap("fields", "not_exist"));
  
          final Schema valueSchema = SchemaBuilder.struct()
              .field("a", Schema.INT32_SCHEMA)
              .build();
  
          final Struct value = new Struct(valueSchema);
          value.put("a", 1);
  
          final SinkRecord record = new SinkRecord("", 0, null, null, valueSchema, value, 0);
  
          DataException actual = assertThrows(DataException.class, () -> xform.apply(record));
          assertEquals("Field does not exist: not_exist", actual.getMessage());
      }
  
      @Test
      public void testValueToKeyVersionRetrievedFromAppInfoParser() {
          assertEquals(AppInfoParser.getVersion(), xform.version());
      }
  
      @ParameterizedTest
      @MethodSource("data")
      public void testReplaceNullWithDefaultConfig(boolean replaceNullWithDefault, Object expectedValue) {
          Map<String, Object> config = new HashMap<>();
          config.put("fields", "optional_with_default");
          config.put("replace.null.with.default", replaceNullWithDefault);
          xform.configure(config);
  
          final Schema valueSchema = SchemaBuilder.struct()
                  .field("optional_with_default", SchemaBuilder.int32().optional().defaultValue(42).build())
                  .build();
          final Struct value = new Struct(valueSchema).put("optional_with_default", null);
  
          final SinkRecord record = new SinkRecord("", 0, null, null, valueSchema, value, 0);
          final SinkRecord transformedRecord = xform.apply(record);
  
          assertEquals(expectedValue, ((Struct) transformedRecord.key()).getWithoutDefault("optional_with_default"));
      }
  }
  