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.test.catalog;
  
  import org.apache.calcite.plan.RelOptTable;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeField;
  import org.apache.calcite.rex.RexBuilder;
  import org.apache.calcite.rex.RexNode;
  import org.apache.calcite.schema.ColumnStrategy;
  import org.apache.calcite.sql.SqlFunction;
  import org.apache.calcite.sql2rel.InitializerContext;
  import org.apache.calcite.sql2rel.InitializerExpressionFactory;
  import org.apache.calcite.sql2rel.NullInitializerExpressionFactory;
  import org.apache.calcite.util.TryThreadLocal;
  
  import com.google.common.collect.ImmutableList;
  
  import java.math.BigDecimal;
  import java.util.List;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /** To check whether
   * {@link InitializerExpressionFactory#newColumnDefaultValue} is called.
   *
   * <p>If a column is in {@code defaultColumns}, returns 1 as the default
   * value. */
  public class CountingFactory extends NullInitializerExpressionFactory {
    public static final TryThreadLocal<AtomicInteger> THREAD_CALL_COUNT =
        TryThreadLocal.withInitial(AtomicInteger::new);
  
    private final List<String> defaultColumns;
  
    CountingFactory(List<String> defaultColumns) {
      this.defaultColumns = ImmutableList.copyOf(defaultColumns);
    }
  
    @Override public ColumnStrategy generationStrategy(RelOptTable table,
        int iColumn) {
      final RelDataTypeField field =
          table.getRowType().getFieldList().get(iColumn);
      if (defaultColumns.contains(field.getName())) {
        return ColumnStrategy.DEFAULT;
      }
      return super.generationStrategy(table, iColumn);
    }
  
    @Override public RexNode newColumnDefaultValue(RelOptTable table,
        int iColumn, InitializerContext context) {
      THREAD_CALL_COUNT.get().incrementAndGet();
      final RelDataTypeField field =
          table.getRowType().getFieldList().get(iColumn);
      if (defaultColumns.contains(field.getName())) {
        final RexBuilder rexBuilder = context.getRexBuilder();
        return rexBuilder.makeExactLiteral(BigDecimal.ONE);
      }
      return super.newColumnDefaultValue(table, iColumn, context);
    }
  
    @Override public RexNode newAttributeInitializer(RelDataType type,
        SqlFunction constructor, int iAttribute,
        List<RexNode> constructorArgs, InitializerContext context) {
      THREAD_CALL_COUNT.get().incrementAndGet();
      return super.newAttributeInitializer(type, constructor, iAttribute,
         constructorArgs, context);
    }
  }
  