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.sql.type;
  
  import org.apache.calcite.avatica.util.ArrayImpl;
  import org.apache.calcite.avatica.util.ByteString;
  
  import com.google.common.collect.ImmutableMap;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  import org.locationtech.jts.geom.Geometry;
  
  import java.math.BigDecimal;
  import java.sql.Date;
  import java.sql.ResultSet;
  import java.sql.Time;
  import java.sql.Timestamp;
  import java.util.List;
  import java.util.Map;
  
  /**
   * JavaToSqlTypeConversionRules defines mappings from common Java types to
   * corresponding SQL types.
   */
  public class JavaToSqlTypeConversionRules {
    //~ Static fields/initializers ---------------------------------------------
  
    private static final JavaToSqlTypeConversionRules INSTANCE =
        new JavaToSqlTypeConversionRules();
  
    //~ Instance fields --------------------------------------------------------
  
    private final Map<Class<?>, SqlTypeName> rules =
        ImmutableMap.<Class<?>, SqlTypeName>builder()
            .put(Integer.class, SqlTypeName.INTEGER)
            .put(int.class, SqlTypeName.INTEGER)
            .put(Long.class, SqlTypeName.BIGINT)
            .put(long.class, SqlTypeName.BIGINT)
            .put(Short.class, SqlTypeName.SMALLINT)
            .put(short.class, SqlTypeName.SMALLINT)
            .put(byte.class, SqlTypeName.TINYINT)
            .put(Byte.class, SqlTypeName.TINYINT)
  
            .put(Float.class, SqlTypeName.REAL)
            .put(float.class, SqlTypeName.REAL)
            .put(Double.class, SqlTypeName.DOUBLE)
            .put(double.class, SqlTypeName.DOUBLE)
  
            .put(boolean.class, SqlTypeName.BOOLEAN)
            .put(Boolean.class, SqlTypeName.BOOLEAN)
            .put(byte[].class, SqlTypeName.VARBINARY)
            .put(ByteString.class, SqlTypeName.VARBINARY)
            .put(String.class, SqlTypeName.VARCHAR)
            .put(char[].class, SqlTypeName.VARCHAR)
            .put(Character[].class, SqlTypeName.VARCHAR)
            .put(Character.class, SqlTypeName.CHAR)
            .put(char.class, SqlTypeName.CHAR)
  
            .put(java.util.Date.class, SqlTypeName.TIMESTAMP)
            .put(Date.class, SqlTypeName.DATE)
            .put(Timestamp.class, SqlTypeName.TIMESTAMP)
            .put(Time.class, SqlTypeName.TIME)
            .put(BigDecimal.class, SqlTypeName.DECIMAL)
  
            .put(Geometry.class, SqlTypeName.GEOMETRY)
  
            .put(ResultSet.class, SqlTypeName.CURSOR)
            .put(ColumnList.class, SqlTypeName.COLUMN_LIST)
            .put(ArrayImpl.class, SqlTypeName.ARRAY)
            .put(List.class, SqlTypeName.ARRAY)
            .put(Map.class, SqlTypeName.MAP)
            .put(Void.class, SqlTypeName.NULL)
            .build();
  
    //~ Methods ----------------------------------------------------------------
  
    /**
     * Returns the
     * {@link org.apache.calcite.util.Glossary#SINGLETON_PATTERN singleton}
     * instance.
     */
    public static JavaToSqlTypeConversionRules instance() {
      return INSTANCE;
    }
  
    /**
     * Returns a corresponding {@link SqlTypeName} for a given Java class.
     *
     * @param javaClass the Java class to lookup
     * @return a corresponding SqlTypeName if found, otherwise null is returned
     */
    public @Nullable SqlTypeName lookup(Class javaClass) {
      return rules.get(javaClass);
    }
  
    /**
     * Make this public when needed. To represent COLUMN_LIST SQL value, we need
     * a type distinguishable from {@link List} in user-defined types.
     */
    private interface ColumnList extends List {
    }
  }
  