HashCodeHelper.java

package com.cattong.commons.util;

import java.util.Arrays;

public final class HashCodeHelper {

	 private static final int multiplierNum = 37;
	  
	 private int hashCode;
	 
	 
	 private HashCodeHelper() {
	     this(17);
	 }

	 private HashCodeHelper(int hashCode) {
	     this.hashCode = hashCode;
	 } 

	 public static HashCodeHelper getInstance() {	 
	     return new HashCodeHelper();	 
	 }

	 public static HashCodeHelper getInstance(int hashCode) {
	     return new HashCodeHelper(hashCode);
	 }

	 public HashCodeHelper appendByte(byte val) {
	     return appendInt(val);
	 }

	 public HashCodeHelper appendShort(short val) {
	     return appendInt(val);
	 }
	 
	 public HashCodeHelper appendChar(char val) {	 
	     return appendInt(val);	 
	 }
	 
	 public HashCodeHelper appendLong(long val) {	 
	     return appendInt((int) (val ^ (val >>> 32)));	 
	 }
	 
	 public HashCodeHelper appendFloat(float val) {	 
	     return appendInt(Float.floatToIntBits(val));	 
	 }

	 public HashCodeHelper appendDouble(double val) {	 
	     return appendLong(Double.doubleToLongBits(val));	 
	 }
	 
	 public HashCodeHelper appendBoolean(boolean val) {	 
	     return appendInt(val ? 1 : 0);	 
	 }
	 
	 public HashCodeHelper appendObj(Object... val) {	 
	     return appendInt(Arrays.deepHashCode(val));	 
	 }
	 
	 public HashCodeHelper appendInt(int val) {	 
	     hashCode = hashCode * multiplierNum + val;	 
	     return this;	 
	 }

	 public int getHashCode() {	 
	     return this.hashCode;	 
	 }

}