org.hornetq.utils.ByteUtil Maven / Gradle / Ivy

/*
 * Copyright 2005-2014 Red Hat, Inc.
 * Red Hat 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.hornetq.utils;

import org.hornetq.api.core.HornetQBuffer;

/**
 * @author Clebert Suconic
 */

public class ByteUtil
{

   protected static final char[] hexArray = "0123456789ABCDEF".toCharArray();

   public static String maxString(String value, int size)
   {
      if (value.length() < size)
      {
         return value;
      }
      else
      {
         return value.substring(0, size / 2) + " ... " + value.substring(value.length() - size / 2);
      }
   }

   public static String bytesToHex(HornetQBuffer buffer, int groupSize)
   {
      int read = buffer.readerIndex();
      buffer.readerIndex(0);
      byte[] bufferRead = new byte[buffer.writerIndex()];
      buffer.readBytes(bufferRead);
      buffer.readerIndex(read);
      return bytesToHex(bufferRead, groupSize);
   }

   public static String bytesToHex(byte[] bytes, int groupSize)
   {
      char[] hexChars = new char[bytes.length * 2 + numberOfGroups(bytes, groupSize)];
      int outPos = 0;
      for (int j = 0; j < bytes.length; j++)
      {
         if (j > 0 && j % groupSize == 0)
         {
            hexChars[outPos++] = ' ';
         }
         int v = bytes[j] & 0xFF;
         hexChars[outPos++] = hexArray[v >>> 4];
         hexChars[outPos++] = hexArray[v & 0x0F];
      }
      return new String(hexChars);
   }

   private static int numberOfGroups(byte[] bytes, int groupSize)
   {
      int groups = bytes.length / groupSize;

      if (bytes.length % groupSize == 0)
      {
         groups--;
      }

      return groups;
   }


}