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.coders;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.equalTo;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.sdk.testing.CoderProperties;
  import org.apache.beam.sdk.transforms.windowing.GlobalWindow;
  import org.apache.beam.sdk.util.CoderUtils;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.junit.Rule;
  import org.junit.Test;
  import org.junit.rules.ExpectedException;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Test case for {@link KvCoder}. */
  @RunWith(JUnit4.class)
  public class KvCoderTest {
    private static class CoderAndData<T> {
      Coder<T> coder;
      List<T> data;
    }
  
    private static class AnyCoderAndData {
      private CoderAndData<?> coderAndData;
    }
  
    private static <T> AnyCoderAndData coderAndData(Coder<T> coder, List<T> data) {
      CoderAndData<T> coderAndData = new CoderAndData<>();
      coderAndData.coder = coder;
      coderAndData.data = data;
      AnyCoderAndData res = new AnyCoderAndData();
      res.coderAndData = coderAndData;
      return res;
    }
  
    private static final List<AnyCoderAndData> TEST_DATA =
        Arrays.asList(
            coderAndData(
                VarIntCoder.of(), Arrays.asList(-1, 0, 1, 13, Integer.MAX_VALUE, Integer.MIN_VALUE)),
            coderAndData(
                BigEndianLongCoder.of(),
                Arrays.asList(-1L, 0L, 1L, 13L, Long.MAX_VALUE, Long.MIN_VALUE)),
            coderAndData(StringUtf8Coder.of(), Arrays.asList("", "hello", "goodbye", "1")),
            coderAndData(
                KvCoder.of(StringUtf8Coder.of(), VarIntCoder.of()),
                Arrays.asList(KV.of("", -1), KV.of("hello", 0), KV.of("goodbye", Integer.MAX_VALUE))),
            coderAndData(
                ListCoder.of(VarLongCoder.of()),
                Arrays.asList(Arrays.asList(1L, 2L, 3L), Collections.emptyList())));
  
    @Test
    @SuppressWarnings("rawtypes")
    public void testDecodeEncodeEqual() throws Exception {
      for (AnyCoderAndData keyCoderAndData : TEST_DATA) {
        Coder keyCoder = keyCoderAndData.coderAndData.coder;
        for (Object key : keyCoderAndData.coderAndData.data) {
          for (AnyCoderAndData valueCoderAndData : TEST_DATA) {
            Coder valueCoder = valueCoderAndData.coderAndData.coder;
            for (Object value : valueCoderAndData.coderAndData.data) {
              CoderProperties.coderDecodeEncodeEqual(
                  KvCoder.of(keyCoder, valueCoder), KV.of(key, value));
            }
          }
        }
      }
    }
  
    @Test
    public void testCoderIsSerializableWithWellKnownCoderType() throws Exception {
      CoderProperties.coderSerializable(
          KvCoder.of(GlobalWindow.Coder.INSTANCE, GlobalWindow.Coder.INSTANCE));
    }
  
    /** Homogeneously typed test value for ease of use with the wire format test utility. */
    private static final Coder<KV<String, Integer>> TEST_CODER =
        KvCoder.of(StringUtf8Coder.of(), VarIntCoder.of());
  
    private static final List<KV<String, Integer>> TEST_VALUES =
        Arrays.asList(KV.of("", -1), KV.of("hello", 0), KV.of("goodbye", Integer.MAX_VALUE));
  
    /**
     * Generated data to check that the wire format has not changed. To regenerate, see {@link
     * org.apache.beam.sdk.coders.PrintBase64Encodings}.
     */
    private static final List<String> TEST_ENCODINGS =
        Arrays.asList("AP____8P", "BWhlbGxvAA", "B2dvb2RieWX_____Bw");
  
    @Test
    public void testWireFormatEncode() throws Exception {
      CoderProperties.coderEncodesBase64(TEST_CODER, TEST_VALUES, TEST_ENCODINGS);
    }
  
    @Rule public ExpectedException thrown = ExpectedException.none();
  
    @Test
    public void encodeNullThrowsCoderException() throws Exception {
      thrown.expect(CoderException.class);
      thrown.expectMessage("cannot encode a null KV");
  
      CoderUtils.encodeToBase64(TEST_CODER, null);
    }
  
    @Test
    public void testEncodedTypeDescriptor() throws Exception {
      TypeDescriptor<KV<String, Integer>> typeDescriptor =
          new TypeDescriptor<KV<String, Integer>>() {};
      assertThat(TEST_CODER.getEncodedTypeDescriptor(), equalTo(typeDescriptor));
    }
  }
  