Class Decimal64

core/src/main/java/io/questdb/std/Decimal64.java:26–970

Decimal64 - a mutable decimal number implementation using 64-bit arithmetic. The value is a signed number with two's complement representation. This class represents decimal numbers with a fixed scale (number of decimal places) using 64-bit integer arithmetic for precise calculations. All operat

 * </p>
 */
public class Decimal64 implements Sinkable, Decimal {
    public static final int MAX_PRECISION = 18;
    /**
     * Maximum allowed scale (number of decimal places)
     * Limited by the range of 64-bit signed long
     */
    public static final int MAX_SCALE = 18;
    public static final Decimal64 MAX_VALUE = new Decimal64(999999999999999999L, 0);
    public static final Decimal64 MIN_VALUE = new Decimal64(-999999999999999999L, 0);
    public static final Decimal64 NULL_VALUE = new Decimal64(Decimals.DECIMAL64_NULL, 0);
    public static final Decimal64 ONE = new Decimal64(1, 0);
    public static final Decimal64 ZERO = new Decimal64(0, 0);
    // Maximum values that 10^n can multiply without overflow
    private static final long[] MAX_SAFE_MULTIPLY = {
            999999999999999999L,
            99999999999999999L,
            9999999999999999L,
            999999999999999L,
            99999999999999L,
            9999999999999L,
            999999999999L,
            99999999999L,
            9999999999L,
            999999999L,
            99999999L,
            9999999L,
            999999L,
            99999L,
            9999L,
            999L,
            99L,
            9L,
            0L
    };
    // Power of 10 lookup table for 64-bit arithmetic (10^0 to 10^18)
    private static final long[] TEN_POWERS_TABLE = {
            1L,                     // 10^0
            10L,                    // 10^1
            100L,                   // 10^2
            1000L,                  // 10^3
            10000L,                 // 10^4
            100000L,                // 10^5
            1000000L,               // 10^6
            10000000L,              // 10^7
            100000000L,             // 10^8
            1000000000L,            // 10^9
            10000000000L,           // 10^10
            100000000000L,          // 10^11
            1000000000000L,         // 10^12
            10000000000000L,        // 10^13
            100000000000000L,       // 10^14
            1000000000000000L,      // 10^15
            10000000000000000L,     // 10^16
            100000000000000000L,    // 10^17
            1000000000000000000L,   // 10^18
    };
    private int scale;   // Number of decimal places
    private long value;  // The decimal value as an unscaled long