org.hornetq.utils.UTF8Util Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* 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 java.lang.ref.SoftReference;
import org.hornetq.api.core.HornetQBuffer;
/**
*
* A UTF8Util
*
* This class will write UTFs directly to the ByteOutput (through the MessageBuffer interface)
*
* @author Clebert Suconic
*
* Created Feb 20, 2009 1:37:18 PM
*
*
*/
public final class UTF8Util
{
private UTF8Util()
{
// utility class
}
private static final boolean isTrace = HornetQUtilLogger.LOGGER.isTraceEnabled();
private static final ThreadLocal> currenBuffer =
new ThreadLocal>();
public static void saveUTF(final HornetQBuffer out, final String str)
{
StringUtilBuffer buffer = UTF8Util.getThreadLocalBuffer();
if (str.length() > 0xffff)
{
throw HornetQUtilBundle.BUNDLE.stringTooLong(str.length());
}
final int len = UTF8Util.calculateUTFSize(str, buffer);
if (len > 0xffff)
{
throw HornetQUtilBundle.BUNDLE.stringTooLong(len);
}
out.writeShort((short)len);
if (len > buffer.byteBuffer.length)
{
buffer.resizeByteBuffer(len);
}
if (len == (long)str.length())
{
for (int byteLocation = 0; byteLocation < len; byteLocation++)
{
buffer.byteBuffer[byteLocation] = (byte)buffer.charBuffer[byteLocation];
}
out.writeBytes(buffer.byteBuffer, 0, len);
}
else
{
if (UTF8Util.isTrace)
{
// This message is too verbose for debug, that's why we are using trace here
HornetQUtilLogger.LOGGER.trace("Saving string with utfSize=" + len + " stringSize=" + str.length());
}
int stringLength = str.length();
int charCount = 0;
for (int i = 0; i < stringLength; i++)
{
char charAtPos = buffer.charBuffer[i];
if (charAtPos >= 1 && charAtPos < 0x7f)
{
buffer.byteBuffer[charCount++] = (byte)charAtPos;
}
else if (charAtPos >= 0x800)
{
buffer.byteBuffer[charCount++] = (byte)(0xE0 | charAtPos >> 12 & 0x0F);
buffer.byteBuffer[charCount++] = (byte)(0x80 | charAtPos >> 6 & 0x3F);
buffer.byteBuffer[charCount++] = (byte)(0x80 | charAtPos >> 0 & 0x3F);
}
else
{
buffer.byteBuffer[charCount++] = (byte)(0xC0 | charAtPos >> 6 & 0x1F);
buffer.byteBuffer[charCount++] = (byte)(0x80 | charAtPos >> 0 & 0x3F);
}
}
out.writeBytes(buffer.byteBuffer, 0, len);
}
}
public static String readUTF(final HornetQBuffer input)
{
StringUtilBuffer buffer = UTF8Util.getThreadLocalBuffer();
final int size = input.readUnsignedShort();
if (size > buffer.byteBuffer.length)
{
buffer.resizeByteBuffer(size);
}
if (size > buffer.charBuffer.length)
{
buffer.resizeCharBuffer(size);
}
if (UTF8Util.isTrace)
{
// This message is too verbose for debug, that's why we are using trace here
HornetQUtilLogger.LOGGER.trace("Reading string with utfSize=" + size);
}
int count = 0;
int byte1, byte2, byte3;
int charCount = 0;
input.readBytes(buffer.byteBuffer, 0, size);
while (count < size)
{
byte1 = buffer.byteBuffer[count++];
if (byte1 > 0 && byte1 <= 0x7F)
{
buffer.charBuffer[charCount++] = (char)byte1;
}
else
{
int c = byte1 & 0xff;
switch (c >> 4)
{
case 0xc:
case 0xd:
byte2 = buffer.byteBuffer[count++];
buffer.charBuffer[charCount++] = (char)((c & 0x1F) << 6 | byte2 & 0x3F);
break;
case 0xe:
byte2 = buffer.byteBuffer[count++];
byte3 = buffer.byteBuffer[count++];
buffer.charBuffer[charCount++] = (char)((c & 0x0F) << 12 | (byte2 & 0x3F) << 6 | (byte3 & 0x3F) << 0);
break;
default:
throw new InternalError("unhandled utf8 byte " + c);
}
}
}
return new String(buffer.charBuffer, 0, charCount);
}
private static StringUtilBuffer getThreadLocalBuffer()
{
SoftReference softReference = UTF8Util.currenBuffer.get();
StringUtilBuffer value;
if (softReference == null)
{
value = new StringUtilBuffer();
softReference = new SoftReference(value);
UTF8Util.currenBuffer.set(softReference);
}
else
{
value = softReference.get();
}
if (value == null)
{
value = new StringUtilBuffer();
softReference = new SoftReference(value);
UTF8Util.currenBuffer.set(softReference);
}
return value;
}
public static void clearBuffer()
{
SoftReference ref = UTF8Util.currenBuffer.get();
if (ref.get() != null)
{
ref.clear();
}
}
public static int calculateUTFSize(final String str, final StringUtilBuffer stringBuffer)
{
int calculatedLen = 0;
int stringLength = str.length();
if (stringLength > stringBuffer.charBuffer.length)
{
stringBuffer.resizeCharBuffer(stringLength);
}
str.getChars(0, stringLength, stringBuffer.charBuffer, 0);
for (int i = 0; i < stringLength; i++)
{
char c = stringBuffer.charBuffer[i];
if (c >= 1 && c < 0x7f)
{
calculatedLen++;
}
else if (c >= 0x800)
{
calculatedLen += 3;
}
else
{
calculatedLen += 2;
}
}
return calculatedLen;
}
private static class StringUtilBuffer
{
public char[] charBuffer;
public byte[] byteBuffer;
public void resizeCharBuffer(final int newSize)
{
if (newSize > charBuffer.length)
{
charBuffer = new char[newSize];
}
}
public void resizeByteBuffer(final int newSize)
{
if (newSize > byteBuffer.length)
{
byteBuffer = new byte[newSize];
}
}
public StringUtilBuffer()
{
this(1024, 1024);
}
public StringUtilBuffer(final int sizeChar, final int sizeByte)
{
charBuffer = new char[sizeChar];
byteBuffer = new byte[sizeByte];
}
}
}