com.yahoo.tensor.impl.TensorAddressAny4 Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of vespajlib Show documentation

Library for use in Java components of Vespa. Shared code which do not fit anywhere else.

There is a newer version: 8.441.21

// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.

package com.yahoo.tensor.impl;

import com.yahoo.tensor.TensorAddress;

import static java.lang.Math.abs;

/**
 * A four-dimensional address.
 *
 * @author baldersheim
 */
final class TensorAddressAny4 extends TensorAddressAny {

    private final long label0, label1, label2, label3;

    TensorAddressAny4(long label0, long label1, long label2, long label3) {
        this.label0 = label0;
        this.label1 = label1;
        this.label2 = label2;
        this.label3 = label3;
    }

    @Override public int size() { return 4; }

    @Override
    public long numericLabel(int i) {
        return switch (i) {
            case 0 -> label0;
            case 1 -> label1;
            case 2 -> label2;
            case 3 -> label3;
            default -> throw new IndexOutOfBoundsException("Index is not in [0,3]: " + i);
        };
    }

    @Override
    public TensorAddress withLabel(int labelIndex, long label) {
        return switch (labelIndex) {
            case 0 -> new TensorAddressAny4(label, label1, label2, label3);
            case 1 -> new TensorAddressAny4(label0, label, label2, label3);
            case 2 -> new TensorAddressAny4(label0, label1,label, label3);
            case 3 -> new TensorAddressAny4(label0, label1, label2, label);
            default -> throw new IllegalArgumentException("No label " + labelIndex);
        };
    }

    @Override
    public int hashCode() {
        long hash =  abs(label0) |
                (abs(label1) << (1*64 - Long.numberOfLeadingZeros(abs(label0)))) |
                (abs(label2) << (2*64 - (Long.numberOfLeadingZeros(abs(label0)) + Long.numberOfLeadingZeros(abs(label1))))) |
                (abs(label3) << (3*64 - (Long.numberOfLeadingZeros(abs(label0)) + Long.numberOfLeadingZeros(abs(label1)) + Long.numberOfLeadingZeros(abs(label1)))));
        return (int) hash;
    }

    @Override
    public boolean equals(Object o) {
        return (o instanceof TensorAddressAny4 any) &&
                (label0 == any.label0) &&
                (label1 == any.label1) &&
                (label2 == any.label2) &&
                (label3 == any.label3);
    }

}