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.adapter.enumerable;
  
  import org.apache.calcite.linq4j.tree.Expression;
  
  import java.lang.reflect.Type;
  import java.util.List;
  
  /**
   * The base implementation of strict window aggregate function.
   *
   * @see org.apache.calcite.adapter.enumerable.RexImpTable.FirstLastValueImplementor
   * @see org.apache.calcite.adapter.enumerable.RexImpTable.RankImplementor
   * @see org.apache.calcite.adapter.enumerable.RexImpTable.RowNumberImplementor
   */
  public abstract class StrictWinAggImplementor extends StrictAggImplementor
      implements WinAggImplementor {
    protected abstract void implementNotNullAdd(WinAggContext info,
        WinAggAddContext add);
  
    protected boolean nonDefaultOnEmptySet(WinAggContext info) {
      return super.nonDefaultOnEmptySet(info);
    }
  
    public List<Type> getNotNullState(WinAggContext info) {
      return super.getNotNullState(info);
    }
  
    protected void implementNotNullReset(WinAggContext info,
        WinAggResetContext reset) {
      super.implementNotNullReset(info, reset);
    }
  
    protected Expression implementNotNullResult(WinAggContext info,
        WinAggResultContext result) {
      return super.implementNotNullResult(info, result);
    }
  
    @Override protected final void implementNotNullAdd(AggContext info,
        AggAddContext add) {
      implementNotNullAdd((WinAggContext) info, (WinAggAddContext) add);
    }
  
    @Override protected boolean nonDefaultOnEmptySet(AggContext info) {
      return nonDefaultOnEmptySet((WinAggContext) info);
    }
  
    @Override public final List<Type> getNotNullState(AggContext info) {
      return getNotNullState((WinAggContext) info);
    }
  
    @Override protected final void implementNotNullReset(AggContext info,
        AggResetContext reset) {
      implementNotNullReset((WinAggContext) info, (WinAggResetContext) reset);
    }
  
    @Override protected final Expression implementNotNullResult(AggContext info,
        AggResultContext result) {
      return implementNotNullResult((WinAggContext) info,
          (WinAggResultContext) result);
    }
  
    @Override public boolean needCacheWhenFrameIntact() {
      return true;
    }
  }
  