/*
 * 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.accumulo.fate;

import java.util.regex.Pattern;

import com.google.common.base.Preconditions;

public class FateTxId {

  private static final String PREFIX = "FTID[";
  private static final String SUFFIX = "]";

  private final static Pattern PATTERN =
      Pattern.compile(Pattern.quote(PREFIX) + "[0-9a-fA-F]+" + Pattern.quote(SUFFIX));

  private static String getHex(String fmtTid) {
    return fmtTid.substring(PREFIX.length(), fmtTid.length() - SUFFIX.length());
  }

  /**
   * @return true if string was created by {@link #formatTid(long)} and false otherwise.
   */
  public static boolean isFormatedTid(String fmtTid) {
    return PATTERN.matcher(fmtTid).matches();
  }

  /**
   * Reverses {@link #formatTid(long)}
   */
  public static long fromString(String fmtTid) {
    Preconditions.checkArgument(fmtTid.startsWith(PREFIX) && fmtTid.endsWith(SUFFIX));
    return Long.parseLong(getHex(fmtTid), 16);
  }

  /**
   * Formats transaction ids in a consistent way that is useful for logging and persisting.
   */
  public static String formatTid(long tid) {
    // do not change how this formats without considering implications for persistence
    return String.format("%s%016x%s", PREFIX, tid, SUFFIX);
  }

}

@@ -980,11 +980,11 @@
 = %22F
-TID
+ATE
 %5B%22;%0A

change FATE prefix #1247