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    • io.permazen.tuple.Tuple Maven / Gradle / Ivy

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/*
 * Copyright (C) 2015 Archie L. Cobbs. All rights reserved.
 */

package io.permazen.tuple;

import java.util.List;

/**
 * Implemented by all "tuple" classes.
 */
public interface Tuple {

    /**
     * Get the number of values in this tuple.
     *
     * @return the size of this tuple
     */
    int getSize();

    /**
     * View this instance as a list.
     *
     * @return unmodifiable {@link List} view of this tuple
     */
    List asList();

    /**
     * Compare for equality.
     *
     * 
    
     * Tuples are equal if they have the same size and the corresponding individual values are equal (or null).
     */
    @Override
    boolean equals(Object obj);

    /**
     * Compute hash code.
     *
     * 
    
     * The hash code of a tuple is the exclusive-OR of the hash codes of the individual values (using zero for null values).
     */
    @Override
    int hashCode();
}
    
    
    
    

    




    
    
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