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.junit.Assert.assertEquals;
  
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  import org.apache.beam.sdk.values.KV;
  import org.apache.beam.sdk.values.TypeDescriptor;
  import org.apache.beam.sdk.values.TypeDescriptors;
  import org.junit.Test;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link CoderProviders}. */
  @RunWith(JUnit4.class)
  public class CoderProvidersTest {
    @Test
    public void testCoderProvidersFromStaticMethodsForParameterlessTypes() throws Exception {
      CoderProvider factory = CoderProviders.fromStaticMethods(String.class, StringUtf8Coder.class);
      assertEquals(
          StringUtf8Coder.of(), factory.coderFor(TypeDescriptors.strings(), Collections.emptyList()));
  
      factory = CoderProviders.fromStaticMethods(Double.class, DoubleCoder.class);
      assertEquals(
          DoubleCoder.of(), factory.coderFor(TypeDescriptors.doubles(), Collections.emptyList()));
  
      factory = CoderProviders.fromStaticMethods(byte[].class, ByteArrayCoder.class);
      assertEquals(
          ByteArrayCoder.of(),
          factory.coderFor(TypeDescriptor.of(byte[].class), Collections.emptyList()));
    }
  
    /**
     * Checks that {#link CoderProviders.fromStaticMethods} successfully builds a working {@link
     * CoderProvider} from {@link KvCoder KvCoder.class}.
     */
    @Test
    public void testKvCoderProvider() throws Exception {
      TypeDescriptor<KV<Double, Double>> type =
          TypeDescriptors.kvs(TypeDescriptors.doubles(), TypeDescriptors.doubles());
      CoderProvider kvCoderProvider = CoderProviders.fromStaticMethods(KV.class, KvCoder.class);
      assertEquals(
          KvCoder.of(DoubleCoder.of(), DoubleCoder.of()),
          kvCoderProvider.coderFor(type, Arrays.asList(DoubleCoder.of(), DoubleCoder.of())));
    }
  
    /**
     * Checks that {#link CoderProviders.fromStaticMethods} successfully builds a working {@link
     * CoderProvider} from {@link ListCoder ListCoder.class}.
     */
    @Test
    public void testListCoderProvider() throws Exception {
      TypeDescriptor<List<Double>> type = TypeDescriptors.lists(TypeDescriptors.doubles());
      CoderProvider listCoderProvider = CoderProviders.fromStaticMethods(List.class, ListCoder.class);
  
      assertEquals(
          ListCoder.of(DoubleCoder.of()),
          listCoderProvider.coderFor(type, Arrays.asList(DoubleCoder.of())));
    }
  
    /**
     * Checks that {#link CoderProviders.fromStaticMethods} successfully builds a working {@link
     * CoderProvider} from {@link IterableCoder IterableCoder.class}.
     */
    @Test
    public void testIterableCoderProvider() throws Exception {
      TypeDescriptor<Iterable<Double>> type = TypeDescriptors.iterables(TypeDescriptors.doubles());
      CoderProvider iterableCoderProvider =
          CoderProviders.fromStaticMethods(Iterable.class, IterableCoder.class);
  
      assertEquals(
          IterableCoder.of(DoubleCoder.of()),
          iterableCoderProvider.coderFor(type, Arrays.asList(DoubleCoder.of())));
    }
  }
  