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package org.mapdb;

import java.util.Arrays;

/**
 * Calculates hash from an object. It also provides `equals` method.
 * Provides an alternative hashing method to {@link org.mapdb.HTreeMap}
 */
public interface  Hasher {

    int hashCode(K k);

    boolean equals(K k1, K k2);


    Hasher BASIC = new Hasher() {
        @Override
        public final int hashCode(  Object k) {
            return k.hashCode();
        }

        @Override
        public boolean equals(Object k1, Object k2) {
            return k1.equals(k2);
        }
    };

    Hasher BYTE_ARRAY = new Hasher() {
        @Override
        public final int hashCode(  byte[] k) {
            return Arrays.hashCode(k);
        }

        @Override
        public boolean equals(byte[] k1, byte[] k2) {
            return Arrays.equals(k1,k2);
        }
    };

    Hasher CHAR_ARRAY = new Hasher() {
        @Override
        public final int hashCode(  char[] k) {
            return Arrays.hashCode(k);
        }

        @Override
        public boolean equals(char[] k1, char[] k2) {
            return Arrays.equals(k1,k2);
        }
    };

    Hasher INT_ARRAY = new Hasher() {
        @Override
        public final int hashCode(  int[] k) {
            return Arrays.hashCode(k);
        }

        @Override
        public boolean equals(int[] k1, int[] k2) {
            return Arrays.equals(k1,k2);
        }
    };

    Hasher LONG_ARRAY = new Hasher() {
        @Override
        public final int hashCode(  long[] k) {
            return Arrays.hashCode(k);
        }

        @Override
        public boolean equals(long[] k1, long[] k2) {
            return Arrays.equals(k1,k2);
        }
    };

    Hasher DOUBLE_ARRAY = new Hasher() {
        @Override
        public final int hashCode(  double[] k) {
            return Arrays.hashCode(k);
        }

        @Override
        public boolean equals(double[] k1, double[] k2) {
            return Arrays.equals(k1,k2);
        }
    };

}