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package org.hibernate.examples.utils;

/**
 * org.hibernate.examples.utils.HashTool
 *
 * @author 배성혁 [email protected]
 * @since 2013. 11. 27. 오후 2:48
 */
public final class HashTool {

    private HashTool() {}

    /**
     * The constant NULL_VALUE.
     */
    public static final int NULL_VALUE = 0;
    /**
     * The constant ONE_VALUE.
     */
    public static final int ONE_VALUE = 1;
    /**
     * The constant FACTOR.
     */
    public static final int FACTOR = 31;

    /**
     * 해시코드를 생성합니다.
     *
     * @param x 해시코드를 생성할 객체
     * @return 해시코드
     */
    private static int computeInternal(final Object x) {
        return (x != null) ? x.hashCode() : NULL_VALUE;
    }

    /**
     * 지정된 객체들의 Hash Code를 조합한 Hash Code를 생성합니다.
     *
     * @param objs 해쉬코드를 생성할 객체 배열
     * @return 조합된 Hash code
     */
    public static int compute(final Object... objs) {
        if (objs == null || objs.length == 0)
            return NULL_VALUE;

        int hash = NULL_VALUE;
        for (Object x : objs) {
            hash = hash * FACTOR + computeInternal(x);
        }
        return hash;
    }
}