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The core QuickFIX/J engine
/*******************************************************************************
* Copyright (c) quickfixengine.org All rights reserved.
*
* This file is part of the QuickFIX FIX Engine
*
* This file may be distributed under the terms of the quickfixengine.org
* license as defined by quickfixengine.org and appearing in the file
* LICENSE included in the packaging of this file.
*
* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING
* THE WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE.
*
* See http://www.quickfixengine.org/LICENSE for licensing information.
*
* Contact [email protected] if any conditions of this licensing
* are not clear to you.
******************************************************************************/
package quickfix;
import java.util.ArrayList;
/**
* A cache for commonly used strings representing numbers.
* Holds values from 0 to 99999.
*/
public final class NumbersCache {
private static final int LITTLE_NUMBERS_LENGTH = 100000;
private static final ArrayList LITTLE_NUMBERS;
static {
LITTLE_NUMBERS = new ArrayList<>(LITTLE_NUMBERS_LENGTH);
for (int i = 0; i < LITTLE_NUMBERS_LENGTH; i++)
LITTLE_NUMBERS.add(Integer.toString(i));
}
/**
* Get the String representing the given number
*
* @param i the long to convert
* @return the String representing the long
*/
public static String get(int i) {
if (i < LITTLE_NUMBERS_LENGTH)
return LITTLE_NUMBERS.get(i);
return String.valueOf(i);
}
/**
* Get the string representing the given double if it's an integer
*
* @param d the double to convert
* @return the String representing the double or null if the double is not an integer
*/
public static String get(double d) {
long l = (long)d;
if (d == (double)l)
return get(l);
return null;
}
}