/*
 * 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.phoenix.coprocessor;

import java.io.IOException;
import java.util.List;
import org.apache.hadoop.hbase.Cell;
import org.apache.hadoop.hbase.DoNotRetryIOException;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.regionserver.RegionScanner;
import org.apache.hadoop.hbase.regionserver.ScannerContext;

public class DelegateRegionScanner implements RegionScanner {

  protected RegionScanner delegate;

  public DelegateRegionScanner(RegionScanner scanner) {
    this.delegate = scanner;
  }

  @Override
  public boolean isFilterDone() throws IOException {
    return delegate.isFilterDone();
  }

  @Override
  public boolean reseek(byte[] row) throws IOException {
    return delegate.reseek(row);
  }

  @Override
  public long getMvccReadPoint() {
    return delegate.getMvccReadPoint();
  }

  @Override
  public void close() throws IOException {
    delegate.close();
  }

  @Override
  public long getMaxResultSize() {
    return delegate.getMaxResultSize();
  }

  @Override
  public boolean next(List<Cell> result, ScannerContext scannerContext) throws IOException {
    return next(result, false, scannerContext);
  }

  @Override
  public boolean next(List<Cell> result) throws IOException {
    return next(result, false, null);
  }

  @Override
  public boolean nextRaw(List<Cell> result, ScannerContext scannerContext) throws IOException {
    return next(result, true, scannerContext);
  }

  @Override
  public boolean nextRaw(List<Cell> result) throws IOException {
    return next(result, true, null);
  }

  @Override
  public int getBatch() {
    return delegate.getBatch();
  }

  @Override
  public RegionInfo getRegionInfo() {
    return delegate.getRegionInfo();
  }

  public RegionScanner getNewRegionScanner(Scan scan) throws IOException {
    try {
      return ((DelegateRegionScanner) delegate).getNewRegionScanner(scan);
    } catch (ClassCastException e) {
      throw new DoNotRetryIOException(e);
    }
  }

  private boolean next(List<Cell> result, boolean raw, ScannerContext scannerContext)
    throws IOException {
    if (scannerContext != null) {
      return raw ? delegate.nextRaw(result, scannerContext) : delegate.next(result, scannerContext);
    }
    return raw ? delegate.nextRaw(result) : delegate.next(result);
  }
}
