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Enterprise Message API (EMA) Java Edition
///*|-----------------------------------------------------------------------------
// *| This source code is provided under the Apache 2.0 license --
// *| and is provided AS IS with no warranty or guarantee of fit for purpose. --
// *| See the project's LICENSE.md for details. --
// *| Copyright (C) 2019 Refinitiv. All rights reserved. --
///*|-----------------------------------------------------------------------------
package com.thomsonreuters.ema.access;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
/**
*
* Utilities that can be used by the EMA applications.
*
*/
public class EmaUtility
{
/**
* Represent as a String all the bytes (in hex format) in a ByteBuffer.
* The lines of hex are appended with respective string representations.
*
* @param buffer ByteBuffer used
* @return String representation of the ByteBuffer
*/
public static String asHexString(ByteBuffer buffer)
{
final int charsPerLine = 16;
StringBuilder asString = new StringBuilder();
StringBuilder currentLine = new StringBuilder();
StringBuilder all = new StringBuilder();
boolean processedFirst = false;
int currentChar = 0;
int length = buffer.limit();
int eobyte= 0;
for (int i = buffer.position(); i < length; i++)
{
if (!(currentChar < charsPerLine))
{
all.append(currentLine.toString());
all.append(" ");
all.append(asString.toString());
currentLine.setLength(0);
asString.setLength(0);
currentChar = 0;
eobyte = 0;
}
byte b = buffer.get(i);
currentLine.append(eobyte%2 != 0 ? String.format("%02X ", b) : String.format("%02X", b));
eobyte ^= 1;
if (b > 31 && b < 127)
asString.append((char)b);
else
asString.append('.');
if (currentChar == 7)
{
currentLine.append(" ");
}
++currentChar;
}
if (currentLine.length() > 0)
{
if (processedFirst)
{
all.append("\n");
eobyte = 0;
}
int fill = currentChar;
while (fill < charsPerLine)
{
currentLine.append(" ");
if (fill == 7)
{
currentLine.append(" ");
}
++fill;
}
all.append(currentLine.toString());
all.append(" ");
all.append(asString.toString());
}
return all.toString();
}
/**
* Represent as a String all the bytes (in hex format) in a ByteBuffer.
* The lines of hex are not appended with respective string representations.
*
* @param buffer ByteBuffer used
* @return String representation of the ByteBuffer as only hex
*/
public static String asRawHexString(ByteBuffer buffer)
{
final int charsPerLine = 16;
StringBuilder currentLine = new StringBuilder();
StringBuilder all = new StringBuilder();
boolean processedFirst = false;
int currentChar = 0;
int length = buffer.limit();
int eobyte= 0;
for (int i = buffer.position(); i < length; i++)
{
if (!(currentChar < charsPerLine))
{
all.append(currentLine.toString() + "\n");
currentLine.setLength(0);
currentChar = 0;
eobyte = 0;
}
byte b = buffer.get(i);
currentLine.append(eobyte%2 != 0 && i != length - 1 && currentChar != charsPerLine - 1 ? String.format("%02X ", b) : String.format("%02X", b));
eobyte ^= 1;
++currentChar;
}
if (currentLine.length() > 0)
{
if (processedFirst)
{
all.append("\n");
eobyte = 0;
}
all.append(currentLine.toString());
}
return all.toString();
}
/**
* Converts the underlying buffer into a String representation of the OmmBuffer.
* This should only be called when the OmmBuffer is known to contain String data.
* This method creates garbage unless the underlying OmmBuffer is a String.
* Please note, that conversion of RMTES buffer to String is not supported
* by this method.
*
* @param ommBuffer OmmBuffer used
* @param charset to be used to decode the OmmBuffer
* @return String representation of the OmmBuffer
*/
public static String asString( OmmBuffer ommBuffer, Charset charset )
{
if (ommBuffer != null)
{
ByteBuffer buffer = ommBuffer.buffer();
byte[] bytes = new byte[ buffer.limit() ];
buffer.get( bytes, 0, buffer.limit() );
return new String( bytes, charset );
}
return null;
}
/**
* Converts the underlying buffer into an ASCII String representation of the OmmBuffer.
* This should only be called when the OmmBuffer is known to contain ASCII data.
* This method is using the US-ASCII for Charset.
* This method creates garbage unless the underlying OmmBuffer is a String.
* Please note, that conversion of RMTES buffer to String is not supported
* by this method.
*
* @param ommBuffer OmmBuffer used
* @return ASCII String representation of the OmmBuffer
*/
public static String asAsciiString( OmmBuffer ommBuffer )
{
return asString( ommBuffer, Charset.forName( "US-ASCII" ) );
}
}