content: package org.apache.bookkeeper.util;
  
  /*
   * 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.
   */
  
  import java.io.IOException;
  import org.apache.bookkeeper.proto.BookkeeperProtocol;
  
  /**
   * Provided utilities for parsing network addresses, ledger-id from node paths
   * etc.
   *
   */
  public class StringUtils {
  
      // Ledger Node Prefix
      public static final String LEDGER_NODE_PREFIX = "L";
      // Ledger znode in flatledgermanager layout will be "L" (prefix) +"%010d" (id in 10 digits)
      public static final String FLAT_LEDGER_NODE_REGEX = StringUtils.LEDGER_NODE_PREFIX + "\\d{10}";
      // top level znode in legacyhierarchicalledgermanger will be just 2 digits
      public static final String LEGACYHIERARCHICAL_LEDGER_PARENT_NODE_REGEX = "\\d{2}";
      // top level znode in longhierarchicalledgermanger will be just 3 digits
      public static final String LONGHIERARCHICAL_LEDGER_PARENT_NODE_REGEX = "\\d{3}";
      // top level znode in hierarchicalledgermanger will be just 2 digits
      public static final String HIERARCHICAL_LEDGER_PARENT_NODE_REGEX = "\\d{2,3}";
  
      /**
       * Formats ledger ID according to ZooKeeper rules.
       *
       * @param id
       *            znode id
       */
      public static String getZKStringId(long id) {
          return String.format("%010d", id);
      }
  
      /**
       * Formats ledger ID according to ZooKeeper rules.
       *
       * @param id
       *            znode id
       */
      public static String getZKStringIdForLongHierarchical(long id) {
          return String.format("%019d", id);
      }
  
      /**
       * Get the hierarchical ledger path according to the ledger id.
       *
       * @param ledgerId
       *          ledger id
       * @return the hierarchical path
       */
      public static String getShortHierarchicalLedgerPath(long ledgerId) {
          String ledgerIdStr = getZKStringId(ledgerId);
          // do 2-4-4 split
          StringBuilder sb = new StringBuilder();
          sb.append("/")
            .append(ledgerIdStr, 0, 2).append("/")
            .append(ledgerIdStr, 2, 6).append("/")
            .append(LEDGER_NODE_PREFIX)
            .append(ledgerIdStr, 6, 10);
          return sb.toString();
      }
  
      /**
       * Get the long hierarchical ledger path according to the ledger id.
       *
       * @param ledgerId
       *          ledger id
       * @return the long hierarchical path
       */
      public static String getLongHierarchicalLedgerPath(long ledgerId) {
          String ledgerIdStr = getZKStringIdForLongHierarchical(ledgerId);
          // do 3-4-4-4-4 split
          StringBuilder sb = new StringBuilder();
          sb.append("/")
            .append(ledgerIdStr, 0, 3).append("/")
            .append(ledgerIdStr, 3, 7).append("/")
            .append(ledgerIdStr, 7, 11).append("/")
            .append(ledgerIdStr, 11, 15).append("/")
            .append(LEDGER_NODE_PREFIX)
            .append(ledgerIdStr, 15, 19);
          return sb.toString();
      }
  
      public static String getHybridHierarchicalLedgerPath(long ledgerId) {
          if (ledgerId < Integer.MAX_VALUE) {
              return getShortHierarchicalLedgerPath(ledgerId);
          }
          return getLongHierarchicalLedgerPath(ledgerId);
      }
  
      /**
       * Parse the hierarchical ledger path to its ledger id.
       *
       * @param hierarchicalLedgerPath
       * @return the ledger id
       * @throws IOException
       */
      public static long stringToHierarchicalLedgerId(String hierarchicalLedgerPath)
              throws IOException {
          String[] hierarchicalParts = hierarchicalLedgerPath.split("/");
          if (hierarchicalParts.length != 3) {
              throw new IOException("it is not a valid hierarchical path name : " + hierarchicalLedgerPath);
          }
          hierarchicalParts[2] =
              hierarchicalParts[2].substring(LEDGER_NODE_PREFIX.length());
          return stringToHierarchicalLedgerId(hierarchicalParts);
      }
  
      /**
       * Parse the long hierarchical ledger path to its ledger id.
       *
       * @param longHierarchicalLedgerPaths
       * @return the ledger id
       * @throws IOException
       */
      public static long stringToLongHierarchicalLedgerId(String longHierarchicalLedgerPath)
              throws IOException {
          String[] longHierarchicalParts = longHierarchicalLedgerPath.split("/");
          if (longHierarchicalParts.length != 5) {
              return stringToHierarchicalLedgerId(longHierarchicalLedgerPath);
          }
          longHierarchicalParts[4] =
                  longHierarchicalParts[4].substring(LEDGER_NODE_PREFIX.length());
          return stringToHierarchicalLedgerId(longHierarchicalParts);
      }
  
      /**
       * Get ledger id.
       *
       * @param levelNodes
       *          level of the ledger path
       * @return ledger id
       * @throws IOException
       */
      public static long stringToHierarchicalLedgerId(String...levelNodes) throws IOException {
          try {
              StringBuilder sb = new StringBuilder();
              for (String node : levelNodes) {
                  sb.append(node);
              }
              return Long.parseLong(sb.toString());
          } catch (NumberFormatException e) {
              throw new IOException(e);
          }
      }
  
      /**
       * Builds string representation of the request without extra (i.e. binary) data
       *
       * @param request
       * @return string representation of request
       */
      public static String requestToString(Object request) {
          if (request instanceof BookkeeperProtocol.Request) {
              BookkeeperProtocol.BKPacketHeader header = ((BookkeeperProtocol.Request) request).getHeader();
              return String.format("Req(txnId=%d,op=%s,version=%s)",
                      header.getTxnId(), header.getOperation(),
                      header.getVersion());
          } else {
              return request.toString();
          }
      }
  }
  