org.neo4j.gds.pricesteiner.PairingHeapElement Maven / Gradle / Ivy

Go to download

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

Neo4j Graph Data Science :: Algorithms

The newest version!

/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.gds.pricesteiner;

class PairingHeapElement {

    private final long pairingId;
    private double value;
    private PairingHeapElement left;
    private PairingHeapElement next;
    private double childrenOffset;

    static PairingHeapElement create(long pairingId, double value) {
        return new PairingHeapElement(pairingId, value, null, null);
    }

    private PairingHeapElement(long pairingId, double value, PairingHeapElement left, PairingHeapElement next) {
        this.pairingId = pairingId;
        this.value = value;
        this.left = left;
        this.next = next;
    }

    void addOffset(double v) {
        childrenOffset += v;
        value += v;
    }

    double childrenOffset() {
        return childrenOffset;
    }

    void addChild(PairingHeapElement child) {
        if (left != null) {
            child.next = left;
        }
        left = child;
    }

    long pairingId() {
        return pairingId;
    }

    double value() {
        return value;
    }

    PairingHeapElement left() {return left;}

    PairingHeapElement next() {return next;}

    void nullifyNext() {
        next = null;
    }

}