jodd.util

Class HashCode

java.lang.Object

jodd.util.HashCode

public class HashCode
extends java.lang.Object

Collected methods which allow easy implementation of hashCode(). Based on items #7 and #8 from "Effective Java" book.

Usage scenario:

 return HashCode.create()
      .hash(value1)
      .hash(value2)
      ...
      .get();
 

Constructor Summary

Constructors

Constructor and Description
HashCode(int seed, int prime)

Method Summary

Modifier and Type	Method and Description
static HashCode	create() Creates new HashCode calculator.
static HashCode	create(int seed, int prime) Creates new HashCode calculator with custom seed and prime number.
int	get() Returns the calculated hashcode value.
HashCode	hash(boolean aBoolean) Calculates hash code for booleans.
HashCode	hash(boolean[] booleanArray) Calculates hash code for boolean array.
HashCode	hash(byte[] byteArray) Calculates hash code for byte array.
HashCode	hash(char aChar) Calculates hash code for chars.
HashCode	hash(char[] charArray) Calculates hash code for char array.
HashCode	hash(double aDouble) Calculates hash code for doubles.
HashCode	hash(double[] doubleArray) Calculates hash code for double array.
HashCode	hash(float aFloat) Calculates hash code for floats.
HashCode	hash(float[] floatArray) Calculates hash code for float array.
HashCode	hash(int anInt) Calculates hash code for ints.
HashCode	hash(int[] intArray) Calculates hash code for int array.
HashCode	hash(long aLong) Calculates hash code for longs.
HashCode	hash(long[] longArray) Calculates hash code for long array.
HashCode	hash(java.lang.Object aObject) Calculates hash code for Objects.
HashCode	hash(short[] shortArray) Calculates hash code for short array.
static int	smear(int hashCode) Smears hash code.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

HashCode

public HashCode(int seed,
                int prime)

Method Detail

smear

public static int smear(int hashCode)

Smears hash code.

create

public static HashCode create()

Creates new HashCode calculator.

create

public static HashCode create(int seed,
                              int prime)

Creates new HashCode calculator with custom seed and prime number.

get

public int get()

Returns the calculated hashcode value.

hash

public HashCode hash(boolean aBoolean)

Calculates hash code for booleans.

hash

public HashCode hash(boolean[] booleanArray)

Calculates hash code for boolean array.

hash

public HashCode hash(char aChar)

Calculates hash code for chars.

hash

public HashCode hash(char[] charArray)

Calculates hash code for char array.

hash

public HashCode hash(int anInt)

Calculates hash code for ints.

hash

public HashCode hash(int[] intArray)

Calculates hash code for int array.

hash

public HashCode hash(short[] shortArray)

Calculates hash code for short array.

hash

public HashCode hash(byte[] byteArray)

Calculates hash code for byte array.

hash

public HashCode hash(long aLong)

Calculates hash code for longs.

hash

public HashCode hash(long[] longArray)

Calculates hash code for long array.

hash

public HashCode hash(float aFloat)

Calculates hash code for floats.

hash

public HashCode hash(float[] floatArray)

Calculates hash code for float array.

hash

public HashCode hash(double aDouble)

Calculates hash code for doubles.

hash

public HashCode hash(double[] doubleArray)

Calculates hash code for double array.

hash

public HashCode hash(java.lang.Object aObject)

Calculates hash code for Objects. Object is a possibly-null object field, and possibly an array.

If aObject is an array, then each element may be a primitive or a possibly-null object.