predicatecomparator.java

来自「java 的源代码」· Java 代码 · 共 26 行

package com.reddragon2046.base.utilities.data.predicates;

import com.reddragon2046.base.utilities.data.BinaryPredicate;
import java.util.Comparator;

public final class PredicateComparator
    implements Comparator
{

    public PredicateComparator(BinaryPredicate predicate)
    {
        this.predicate = predicate;
    }

    public int compare(Object first, Object second)
    {
        boolean less = predicate.execute(first, second);
        if(less ^ predicate.execute(second, first))
            return less ? -1 : 1;
        else
            return 0;
    }

    private BinaryPredicate predicate;
}