content: /*
   *
   * 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.bookkeeper.util;
  
  import java.util.UUID;
  import org.apache.bookkeeper.common.util.ReflectionUtils;
  import org.apache.bookkeeper.conf.AbstractConfiguration;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Formatter to format a ledgerId.
   */
  public abstract class LedgerIdFormatter {
  
      private static final Logger LOG = LoggerFactory.getLogger(LedgerIdFormatter.class);
  
      /**
       * Formats the LedgerId according to the type of the Formatter and return it
       * in String format.
       *
       * @param ledgerId
       * @return
       */
      public abstract String formatLedgerId(long ledgerId);
  
      /**
       * converts the ledgeridString, which is in format of the type of formatter,
       * to the long value.
       *
       * @param ledgerIdString
       * @return
       */
      public abstract long readLedgerId(String ledgerIdString);
  
      // Used by BKExtentIdByteArray
      public static final LedgerIdFormatter LONG_LEDGERID_FORMATTER = new LongLedgerIdFormatter();
  
      public static LedgerIdFormatter newLedgerIdFormatter(AbstractConfiguration<?> conf) {
          LedgerIdFormatter formatter;
          try {
              Class<? extends LedgerIdFormatter> ledgerIdFormatterClass = conf.getLedgerIdFormatterClass();
              formatter = ReflectionUtils.newInstance(ledgerIdFormatterClass);
          } catch (Exception e) {
              LOG.warn("No formatter class found", e);
              LOG.warn("Using Default Long Formatter.");
              formatter = new LongLedgerIdFormatter();
          }
          return formatter;
      }
  
      public static LedgerIdFormatter newLedgerIdFormatter(String opt, AbstractConfiguration conf) {
          LedgerIdFormatter formatter;
          if ("hex".equals(opt)) {
              formatter = new LedgerIdFormatter.HexLedgerIdFormatter();
          } else if ("uuid".equals(opt)) {
              formatter = new LedgerIdFormatter.UUIDLedgerIdFormatter();
          } else if ("long".equals(opt)) {
              formatter = new LedgerIdFormatter.LongLedgerIdFormatter();
          } else {
              LOG.warn("specified unexpected ledgeridformat {}, so default LedgerIdFormatter is used", opt);
              formatter = newLedgerIdFormatter(conf);
          }
          return formatter;
      }
  
      /**
       * long ledgerId formatter.
       */
      public static class LongLedgerIdFormatter extends LedgerIdFormatter {
  
          @Override
          public String formatLedgerId(long ledgerId) {
              return Long.toString(ledgerId);
          }
  
          @Override
          public long readLedgerId(String ledgerIdString) {
              return Long.parseLong(ledgerIdString.trim());
          }
      }
  
      /**
       * hex ledgerId formatter.
       */
      public static class HexLedgerIdFormatter extends LedgerIdFormatter {
  
          @Override
          public String formatLedgerId(long ledgerId) {
              return Long.toHexString(ledgerId);
          }
  
          @Override
          public long readLedgerId(String ledgerIdString) {
              return Long.valueOf(ledgerIdString.trim(), 16);
          }
      }
  
      /**
       * uuid ledgerId formatter.
       */
      public static class UUIDLedgerIdFormatter extends LedgerIdFormatter {
  
          @Override
          public String formatLedgerId(long ledgerId) {
              return (new UUID(0, ledgerId)).toString();
          }
  
          @Override
          public long readLedgerId(String ledgerIdString) {
              return UUID.fromString(ledgerIdString.trim()).getLeastSignificantBits();
          }
      }
  }
  