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/**
 * Copyright (C) 2015 Greg Brandt ([email protected])
 *
 * Licensed 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 com.github.brandtg.switchboard;

public class HdfsLogUtils {
  public static long getInProgressLowWatermarkTxid(String logName) {
    return Long.valueOf(logName.substring("edits_inprogress_".length()));
  }

  public static long getLogLowWatermarkTxid(String logName) {
    return Long.valueOf(logName.substring("edits_".length(), logName.indexOf("-")));
  }

  public static long getLogHighWatermarkTxid(String logName) {
    return Long.valueOf(logName.substring(logName.indexOf("-") + 1));
  }

  public static String getLogFileName(long firstTxid, long lastTxid) {
    return String.format("edits_%s-%s", getLogFileTxidComponent(firstTxid), getLogFileTxidComponent(lastTxid));
  }

  public static String getLogFileTxidComponent(long txid) {
    return String.format("%019d", txid);
  }
}