testkit/src/main/java/org/apache/calcite/test/catalog/EmpInitializerExpressionFactory.java

/*
 * 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.test.catalog;

import org.apache.calcite.plan.RelOptTable;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.rex.RexBuilder;
import org.apache.calcite.rex.RexNode;
import org.apache.calcite.schema.ColumnStrategy;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.calcite.sql2rel.InitializerContext;
import org.apache.calcite.sql2rel.NullInitializerExpressionFactory;

import java.math.BigDecimal;

/** Default values for the "EMPDEFAULTS" table. */
class EmpInitializerExpressionFactory
    extends NullInitializerExpressionFactory {
  @Override public ColumnStrategy generationStrategy(RelOptTable table,
      int iColumn) {
    switch (iColumn) {
    case 0:
    case 1:
    case 5:
      return ColumnStrategy.DEFAULT;
    default:
      return super.generationStrategy(table, iColumn);
    }
  }

  @Override public RexNode newColumnDefaultValue(RelOptTable table,
      int iColumn, InitializerContext context) {
    final RexBuilder rexBuilder = context.getRexBuilder();
    final RelDataTypeFactory typeFactory = rexBuilder.getTypeFactory();
    switch (iColumn) {
    case 0:
      return rexBuilder.makeExactLiteral(new BigDecimal(123),
          typeFactory.createSqlType(SqlTypeName.INTEGER));
    case 1:
      return rexBuilder.makeLiteral("Bob");
    case 5:
      return rexBuilder.makeExactLiteral(new BigDecimal(555),
          typeFactory.createSqlType(SqlTypeName.INTEGER));
    default:
      return super.newColumnDefaultValue(table, iColumn, context);
    }
  }
}