/*
 * 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.compat.hbase;

import java.io.IOException;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.CellComparator;
import org.apache.hadoop.hbase.MetaTableAccessor;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
import org.apache.hadoop.hbase.io.compress.Compression.Algorithm;
import org.apache.hadoop.hbase.io.encoding.DataBlockEncoding;
import org.apache.hadoop.hbase.io.hfile.HFileContext;
import org.apache.hadoop.hbase.io.hfile.HFileContextBuilder;
import org.apache.hadoop.hbase.regionserver.StoreUtils;
import org.apache.hadoop.hbase.util.ChecksumType;
import org.apache.hadoop.hbase.util.VersionInfo;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class CompatUtil {

  private static final Logger LOGGER = LoggerFactory.getLogger(CompatUtil.class);

  private static boolean hasFixedShortCircuitConnection =
    VersionInfo.compareVersion(VersionInfo.getVersion(), "2.4.12") >= 0;

  private CompatUtil() {
    // Not to be instantiated
  }

  public static HFileContext createHFileContext(Configuration conf, Algorithm compression,
    Integer blockSize, DataBlockEncoding encoding, CellComparator comparator) {

    return new HFileContextBuilder().withCompression(compression)
      .withChecksumType(StoreUtils.getChecksumType(conf))
      .withBytesPerCheckSum(StoreUtils.getBytesPerChecksum(conf)).withBlockSize(blockSize)
      .withDataBlockEncoding(encoding).build();
  }

  public static List<RegionInfo> getMergeRegions(Connection conn, RegionInfo regionInfo)
    throws IOException {
    return MetaTableAccessor.getMergeRegions(conn, regionInfo.getRegionName());
  }

  public static ChecksumType getChecksumType(Configuration conf) {
    return StoreUtils.getChecksumType(conf);
  }

  public static int getBytesPerChecksum(Configuration conf) {
    return StoreUtils.getBytesPerChecksum(conf);
  }

  public static Connection createShortCircuitConnection(final Configuration configuration,
    final RegionCoprocessorEnvironment env) throws IOException {
    if (hasFixedShortCircuitConnection) {
      return env.createConnection(configuration);
    } else {
      return org.apache.hadoop.hbase.client.ConnectionFactory.createConnection(configuration);
    }
  }
}
