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;
}
}