fr.dyade.aaa.agent.StringId Maven / Gradle / Ivy
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Builds the Joram a3 rt project.
/*
* Copyright (C) 2004 - 2020 ScalAgent Distributed Technologies
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA.
*
* Initial developer(s): ScalAgent Distributed Technologies
*/
package fr.dyade.aaa.agent;
public final class StringId {
private final static int BUFLEN = 35;
// Per-thread buffer for string/stringbuffer conversion
private static ThreadLocal perThreadBuffer = new ThreadLocal() {
protected synchronized Object initialValue() {
return new char[BUFLEN];
}
};
/**
* Returns a string representation of id: label + x + sep + y + sep + z.
* At least x must be provided and higher or equal to 0, if y or z are less
* than 0 they are ignored.
*
* @param label prefix
* @param sep separator
* @param x first index
* @param y second index
* @param z third index
* @return the string representation of identifier
*/
public final static String toStringId(char label, char sep,
int x, int y, int z) {
int idx = BUFLEN;
char[] buf = (char[]) (perThreadBuffer.get());
if (z >= 0) {
idx = getChars(z, buf, idx);
buf[--idx] = sep;
}
if (y >= 0) {
idx = getChars(y, buf, idx);
buf[--idx] = sep;
}
idx = getChars(x, buf, idx);
buf[--idx] = label;
return new String(buf, idx, BUFLEN - idx);
}
final static char [] DigitTens = {
'0', '0', '0', '0', '0', '0', '0', '0', '0', '0',
'1', '1', '1', '1', '1', '1', '1', '1', '1', '1',
'2', '2', '2', '2', '2', '2', '2', '2', '2', '2',
'3', '3', '3', '3', '3', '3', '3', '3', '3', '3',
'4', '4', '4', '4', '4', '4', '4', '4', '4', '4',
'5', '5', '5', '5', '5', '5', '5', '5', '5', '5',
'6', '6', '6', '6', '6', '6', '6', '6', '6', '6',
'7', '7', '7', '7', '7', '7', '7', '7', '7', '7',
'8', '8', '8', '8', '8', '8', '8', '8', '8', '8',
'9', '9', '9', '9', '9', '9', '9', '9', '9', '9',
} ;
final static char [] DigitOnes = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
} ;
private final static int getChars(int i, char[] buf, int idx) {
int q, r;
int charPos = idx;
// Generate two digits per iteration
while (i >= 65536) {
q = i / 100;
// really: r = i - (q * 100);
r = i - ((q << 6) + (q << 5) + (q << 2));
i = q;
buf [--charPos] = DigitOnes[r];
buf [--charPos] = DigitTens[r];
}
// Fall thru to fast mode for smaller numbers
// assert(i <= 65536, i);
for (;;) {
q = (i * 52429) >>> (16+3);
r = i - ((q << 3) + (q << 1)); // r = i-(q*10) ...
buf [--charPos] = DigitOnes[r];
i = q;
if (i == 0) break;
}
return charPos;
}
}