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.calcite.jdbc;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.test.SqlTests;
  import org.apache.calcite.sql.type.SqlTypeName;
  
  import com.google.common.collect.ImmutableList;
  
  import org.junit.jupiter.api.Test;
  
  import java.lang.reflect.Type;
  
  import static org.apache.calcite.linq4j.tree.Types.RecordType;
  
  import static org.hamcrest.CoreMatchers.is;
  import static org.hamcrest.MatcherAssert.assertThat;
  import static org.junit.jupiter.api.Assertions.assertTrue;
  
  /**
   * Test for {@link org.apache.calcite.jdbc.JavaTypeFactoryImpl}.
   */
  public final class JavaTypeFactoryTest {
    private static final JavaTypeFactoryImpl TYPE_FACTORY = new JavaTypeFactoryImpl();
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-2677">[CALCITE-2677]
     * Struct types with one field are not mapped correctly to Java Classes</a>. */
    @Test void testGetJavaClassWithOneFieldStructDataTypeV1() {
      RelDataType structWithOneField = TYPE_FACTORY.createStructType(OneFieldStruct.class);
      assertThat(TYPE_FACTORY.getJavaClass(structWithOneField),
          is(OneFieldStruct.class));
    }
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-2677">[CALCITE-2677]
     * Struct types with one field are not mapped correctly to Java Classes</a>. */
    @Test void testGetJavaClassWithOneFieldStructDataTypeV2() {
      RelDataType structWithOneField =
          TYPE_FACTORY.createStructType(
              ImmutableList.of(TYPE_FACTORY.createSqlType(SqlTypeName.INTEGER)),
              ImmutableList.of("intField"));
      assertRecordType(TYPE_FACTORY.getJavaClass(structWithOneField));
    }
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-2677">[CALCITE-2677]
     * Struct types with one field are not mapped correctly to Java Classes</a>. */
    @Test void testGetJavaClassWithTwoFieldsStructDataType() {
      RelDataType structWithTwoFields = TYPE_FACTORY.createStructType(TwoFieldStruct.class);
      assertThat(TYPE_FACTORY.getJavaClass(structWithTwoFields),
          is(TwoFieldStruct.class));
    }
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-2677">[CALCITE-2677]
     * Struct types with one field are not mapped correctly to Java Classes</a>. */
    @Test void testGetJavaClassWithTwoFieldsStructDataTypeV2() {
      RelDataType structWithTwoFields =
          TYPE_FACTORY.createStructType(
              ImmutableList.of(TYPE_FACTORY.createSqlType(SqlTypeName.INTEGER),
                  TYPE_FACTORY.createSqlType(SqlTypeName.VARCHAR)),
          ImmutableList.of("intField", "strField"));
      assertRecordType(TYPE_FACTORY.getJavaClass(structWithTwoFields));
    }
  
    /** Test case for
     * <a href="https://issues.apache.org/jira/browse/CALCITE-3029">[CALCITE-3029]
     * Java-oriented field type is wrongly forced to be NOT NULL after being converted to
     * SQL-oriented</a>. */
    @Test void testFieldNullabilityAfterConvertingToSqlStructType() {
      RelDataType javaStructType =
          TYPE_FACTORY.createStructType(
              ImmutableList.of(TYPE_FACTORY.createJavaType(Integer.class),
                  TYPE_FACTORY.createJavaType(int.class)),
          ImmutableList.of("a", "b"));
      RelDataType sqlStructType = TYPE_FACTORY.toSql(javaStructType);
      assertThat(SqlTests.getTypeString(sqlStructType),
          is("RecordType(INTEGER a, INTEGER NOT NULL b) NOT NULL"));
    }
  
    private void assertRecordType(Type actual) {
      assertTrue(actual instanceof RecordType,
          () -> "Type {" + actual.getTypeName() + "} is not a subtype of Types.RecordType");
    }
  
    /** Struct with one field. */
    private static class OneFieldStruct {
      public Integer intField;
    }
  
    /** Struct with two fields. */
    private static class TwoFieldStruct {
      public Integer intField;
      public String strField;
    }
  }
  