static {
try {
TIME_STAMP_DELIMITER = ": ".getBytes(CharsetSupport.getCharset());
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
private void writeMessage(FileOutputStream stream, String message, boolean forceTimestamp) {
try {
if (forceTimestamp || includeTimestampForMessages) {
writeTimeStamp(stream);
}
stream.write(message.getBytes(CharsetSupport.getCharset()));
stream.write('\n');
stream.flush();
if (syncAfterWrite) {
stream.getFD().sync();
}
} catch (IOException e) {
// QFJ-459: no point trying to log the error in the file if we had an IOException
// we will end up with a java.lang.StackOverflowError
System.err.println("error writing message to log : " + message);
e.printStackTrace(System.err);
}
}
/**
* Calculates the checksum for the given data.
*
* @param charset the charset used in encoding the data
* @param data the data to calculate the checksum on
* @param isEntireMessage specifies whether the data is an entire message; if true, and it ends
* with a checksum field, that checksum field is excluded from the current checksum
* calculation
* @return the calculated checksum
*/
public static int checksum(Charset charset, String data, boolean isEntireMessage) {
int sum = 0;
if (CharsetSupport.isStringEquivalent(charset)) { // optimization - skip encoding
int end = isEntireMessage ? data.lastIndexOf("\00110=") : -1;
int len = end > -1 ? end + 1 : data.length();
for (int i = 0; i < len; i++) {
sum += data.charAt(i);
}
} else {
byte[] bytes = data.getBytes(charset);
int len = bytes.length;
if (isEntireMessage
&& bytes[len - 8] == '\001'
&& bytes[len - 7] == '1'
&& bytes[len - 6] == '0'
&& bytes[len - 5] == '=') len = len - 7;
for (int i = 0; i < len; i++) {
sum += (bytes[i] & 0xFF);
}
}
return sum & 0xFF; // better than sum % 256 since it avoids overflow issues
}
/**
* Calculates the length of the byte representation of the given string in the given charset.
*
* @param charset the charset used in encoding the data
* @param data the data to calculate the length on
* @return the calculated length
*/
public static int length(Charset charset, String data) {
return CharsetSupport.isStringEquivalent(charset)
? data.length()
: data.getBytes(charset).length;
}
/**
* Calculates the checksum for the given message (excluding existing checksum field, if one
* exists). The {@link CharsetSupport#setCharset global charset} is used.
*
* @param message the message to calculate the checksum on
* @return the calculated checksum
*/
public static int checksum(String message) {
return checksum(CharsetSupport.getCharsetInstance(), message, true);
}
private void writeTimeStamp(OutputStream out) throws IOException {
String formattedTime = UtcTimestampConverter.convert(SystemTime.getDate(), includeMillis);
out.write(formattedTime.getBytes(CharsetSupport.getCharset()));
out.write(TIME_STAMP_DELIMITER);
}
