/**
 *
 * 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.hadoop.hbase.util;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.io.hfile.CacheConfig;
import org.apache.hadoop.hbase.io.hfile.HFile;
import org.apache.hadoop.hbase.io.hfile.HFileContext;
import org.apache.hadoop.hbase.io.hfile.HFileContextBuilder;
import org.apache.hadoop.hbase.regionserver.StoreFile;

import java.io.IOException;

/**
 * Utility class for HFile-related testing.
 */
public class HFileTestUtil {

  /**
   * Create an HFile with the given number of rows between a given
   * start key and end key.
   */
  public static void createHFile(
      Configuration configuration,
      FileSystem fs, Path path,
      byte[] family, byte[] qualifier,
      byte[] startKey, byte[] endKey, int numRows) throws IOException
  {
    HFileContext meta = new HFileContextBuilder().build();
    HFile.Writer writer = HFile.getWriterFactory(configuration, new CacheConfig(configuration))
        .withPath(fs, path)
        .withFileContext(meta)
        .create();
    long now = System.currentTimeMillis();
    try {
      // subtract 2 since iterateOnSplits doesn't include boundary keys
      for (byte[] key : Bytes.iterateOnSplits(startKey, endKey, numRows-2)) {
        KeyValue kv = new KeyValue(key, family, qualifier, now, key);
        writer.append(kv);
      }
    } finally {
      writer.appendFileInfo(StoreFile.BULKLOAD_TIME_KEY,
          Bytes.toBytes(System.currentTimeMillis()));
      writer.close();
    }
  }
}