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Elasticsearch subproject :x-pack:plugin:esql:compute
There is a newer version: 8.16.1
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0; you may not use this file except in compliance with the Elastic License
 * 2.0.
 */

package org.elasticsearch.compute.data;

import org.apache.lucene.util.RamUsageEstimator;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.core.ReleasableIterator;

/**
 * Vector implementation that stores a constant double value.
 * This class is generated. Do not edit it.
 */
final class ConstantDoubleVector extends AbstractVector implements DoubleVector {

    static final long RAM_BYTES_USED = RamUsageEstimator.shallowSizeOfInstance(ConstantDoubleVector.class);

    private final double value;

    ConstantDoubleVector(double value, int positionCount, BlockFactory blockFactory) {
        super(positionCount, blockFactory);
        this.value = value;
    }

    @Override
    public double getDouble(int position) {
        return value;
    }

    @Override
    public DoubleBlock asBlock() {
        return new DoubleVectorBlock(this);
    }

    @Override
    public DoubleVector filter(int... positions) {
        return blockFactory().newConstantDoubleVector(value, positions.length);
    }

    @Override
    public ReleasableIterator lookup(IntBlock positions, ByteSizeValue targetBlockSize) {
        if (positions.getPositionCount() == 0) {
            return ReleasableIterator.empty();
        }
        IntVector positionsVector = positions.asVector();
        if (positionsVector == null) {
            return new DoubleLookup(asBlock(), positions, targetBlockSize);
        }
        int min = positionsVector.min();
        if (min < 0) {
            throw new IllegalArgumentException("invalid position [" + min + "]");
        }
        if (min > getPositionCount()) {
            return ReleasableIterator.single((DoubleBlock) positions.blockFactory().newConstantNullBlock(positions.getPositionCount()));
        }
        if (positionsVector.max() < getPositionCount()) {
            return ReleasableIterator.single(positions.blockFactory().newConstantDoubleBlockWith(value, positions.getPositionCount()));
        }
        return new DoubleLookup(asBlock(), positions, targetBlockSize);
    }

    @Override
    public ElementType elementType() {
        return ElementType.DOUBLE;
    }

    @Override
    public boolean isConstant() {
        return true;
    }

    @Override
    public long ramBytesUsed() {
        return RAM_BYTES_USED;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj instanceof DoubleVector that) {
            return DoubleVector.equals(this, that);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return DoubleVector.hash(this);
    }

    public String toString() {
        return getClass().getSimpleName() + "[positions=" + getPositionCount() + ", value=" + value + ']';
    }
}