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.schemas.transforms;
  
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.hamcrest.Matchers.containsInAnyOrder;
  import static org.hamcrest.Matchers.empty;
  import static org.hamcrest.Matchers.not;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertTrue;
  
  import java.math.BigDecimal;
  import java.util.Arrays;
  import java.util.List;
  import java.util.Map;
  import org.apache.beam.sdk.schemas.Schema;
  import org.apache.beam.sdk.schemas.Schema.FieldType;
  import org.apache.beam.sdk.schemas.Schema.TypeName;
  import org.apache.beam.sdk.testing.UsesSchema;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableList;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableMap;
  import org.junit.Test;
  import org.junit.experimental.categories.Category;
  import org.junit.runner.RunWith;
  import org.junit.runners.JUnit4;
  
  /** Tests for {@link Cast.Widening}, {@link Cast.Narrowing}. */
  @Category(UsesSchema.class)
  @RunWith(JUnit4.class)
  public class CastValidatorTest {
  
    public static final Map<TypeName, Number> NUMERICS =
        ImmutableMap.<TypeName, Number>builder()
            .put(TypeName.BYTE, Byte.valueOf((byte) 42))
            .put(TypeName.INT16, Short.valueOf((short) 42))
            .put(TypeName.INT32, Integer.valueOf(42))
            .put(TypeName.INT64, Long.valueOf(42))
            .put(TypeName.FLOAT, Float.valueOf(42))
            .put(TypeName.DOUBLE, Double.valueOf(42))
            .put(TypeName.DECIMAL, BigDecimal.valueOf(42))
            .build();
  
    public static final List<TypeName> NUMERIC_ORDER =
        ImmutableList.of(
            TypeName.BYTE,
            TypeName.INT16,
            TypeName.INT32,
            TypeName.INT64,
            TypeName.FLOAT,
            TypeName.DOUBLE,
            TypeName.DECIMAL);
  
    @Test
    public void testWideningOrder() {
      NUMERICS
          .keySet()
          .forEach(input -> NUMERICS.keySet().forEach(output -> testWideningOrder(input, output)));
    }
  
    @Test
    public void testCasting() {
      NUMERICS
          .keySet()
          .forEach(input -> NUMERICS.keySet().forEach(output -> testCasting(input, output)));
    }
  
    private void testCasting(TypeName inputType, TypeName outputType) {
      Object output =
          Cast.castValue(NUMERICS.get(inputType), FieldType.of(inputType), FieldType.of(outputType));
  
      assertEquals(NUMERICS.get(outputType), output);
    }
  
    @Test
    public void testCastingCompleteness() {
      boolean all =
          NUMERIC_ORDER.stream().filter(TypeName::isNumericType).allMatch(NUMERIC_ORDER::contains);
  
      assertTrue(all);
    }
  
    private void testWideningOrder(TypeName input, TypeName output) {
      Schema inputSchema = Schema.of(Schema.Field.of("f0", FieldType.of(input)));
      Schema outputSchema = Schema.of(Schema.Field.of("f0", FieldType.of(output)));
  
      List<Cast.CompatibilityError> errors = Cast.Widening.of().apply(inputSchema, outputSchema);
  
      if (NUMERIC_ORDER.indexOf(input) <= NUMERIC_ORDER.indexOf(output)) {
        assertThat(input + " is before " + output, errors, empty());
      } else {
        assertThat(input + " is after " + output, errors, not(empty()));
      }
    }
  
    @Test
    public void testWideningNullableToNotNullable() {
      Schema input = Schema.of(Schema.Field.nullable("f0", FieldType.INT32));
      Schema output = Schema.of(Schema.Field.of("f0", FieldType.INT32));
  
      List<Cast.CompatibilityError> errors = Cast.Widening.of().apply(input, output);
      Cast.CompatibilityError expected =
          Cast.CompatibilityError.create(
              Arrays.asList("f0"), "Can't cast nullable field to non-nullable field");
  
      assertThat(errors, containsInAnyOrder(expected));
    }
  
    @Test
    public void testNarrowingNullableToNotNullable() {
      Schema input = Schema.of(Schema.Field.nullable("f0", FieldType.INT32));
      Schema output = Schema.of(Schema.Field.of("f0", FieldType.INT32));
  
      List<Cast.CompatibilityError> errors = Cast.Narrowing.of().apply(input, output);
  
      assertThat(errors, empty());
    }
  }
  