com.maxifier.mxcache.hashing.TupleHashingStrategy Maven / Gradle / Ivy

/*
 * Copyright (c) 2008-2014 Maxifier Ltd. All Rights Reserved.
 */
package com.maxifier.mxcache.hashing;

import com.maxifier.mxcache.tuple.Tuple;

/**
 * @author Alexander Kochurov ([email protected])
 */
public final class TupleHashingStrategy implements gnu.trove.strategy.HashingStrategy {
    private static final long serialVersionUID = 100L;

    /** Huge prime number, just a hash for null value */
    private static final int NULL_HASH = 30029;

    private final Object[] strategies;

    public TupleHashingStrategy(Object[] strategies) {
        this.strategies = strategies;
    }

    @Override
    public int computeHashCode(Tuple object) {
        return object == null ? NULL_HASH : object.hashCode(strategies);
    }

    @Override
    public boolean equals(Tuple o1, Tuple o2) {
        if (o1 == o2) {
            return true;
        }
        if (o1 == null || o2 == null) {
            return false;
        }
        return o1.equals(o2, strategies);
    }
}