/*
 * 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.impl;

import org.apache.calcite.adapter.enumerable.RexToLixTranslator;
import org.apache.calcite.adapter.enumerable.WinAggFrameResultContext;
import org.apache.calcite.adapter.enumerable.WinAggImplementor;
import org.apache.calcite.adapter.enumerable.WinAggResultContext;
import org.apache.calcite.linq4j.tree.BlockBuilder;
import org.apache.calcite.linq4j.tree.Expression;

import com.google.common.base.Function;

import java.util.List;

/**
 * Implementation of
 * {@link org.apache.calcite.adapter.enumerable.WinAggResultContext}.
 */
public abstract class WinAggResultContextImpl extends AggResultContextImpl
    implements WinAggResultContext {

  private final Function<BlockBuilder, WinAggFrameResultContext> frame;

  /**
   * Creates window aggregate result context.
   * @param block code block that will contain the added initialization
   * @param accumulator accumulator variables that store the intermediate
   *                    aggregate state
   */
  public WinAggResultContextImpl(BlockBuilder block,
      List<Expression> accumulator,
      Function<BlockBuilder, WinAggFrameResultContext> frameContextBuilder) {
    super(block, null, accumulator, null, null);
    this.frame = frameContextBuilder;
  }

  private WinAggFrameResultContext getFrame() {
    return frame.apply(currentBlock());
  }

  public final List<Expression> arguments(Expression rowIndex) {
    return rowTranslator(rowIndex).translateList(rexArguments());
  }

  public Expression computeIndex(Expression offset,
      WinAggImplementor.SeekType seekType) {
    return getFrame().computeIndex(offset, seekType);
  }

  public Expression rowInFrame(Expression rowIndex) {
    return getFrame().rowInFrame(rowIndex);
  }

  public Expression rowInPartition(Expression rowIndex) {
    return getFrame().rowInPartition(rowIndex);
  }

  public RexToLixTranslator rowTranslator(Expression rowIndex) {
    return getFrame().rowTranslator(rowIndex)
        .setNullable(currentNullables());
  }

  public Expression compareRows(Expression a, Expression b) {
    return getFrame().compareRows(a, b);
  }

  public Expression index() {
    return getFrame().index();
  }

  public Expression startIndex() {
    return getFrame().startIndex();
  }

  public Expression endIndex() {
    return getFrame().endIndex();
  }

  public Expression hasRows() {
    return getFrame().hasRows();
  }

  public Expression getFrameRowCount() {
    return getFrame().getFrameRowCount();
  }

  public Expression getPartitionRowCount() {
    return getFrame().getPartitionRowCount();
  }
}

// End WinAggResultContextImpl.java
