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This project allows a user to interact with ESP services in a controlled manner. The API calls available under org.hpccsystems.ws.client.platform allow for a user to target ESP's across multiple environments running a range of hpccsystems-platform versions. There is no guarantee that if a user utilizes org.hpccsystems.ws.client.gen generated stub code from wsdl, that the calls will be backwards compatible with older hpccsystems-platform versions.
/*******************************************************************************
* Copyright (c) 2011 HPCC Systems. All rights reserved. This program and the accompanying materials are made available
* under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors: HPCC Systems - initial API and implementation
******************************************************************************/
package org.hpccsystems.ws.client.utils;
import java.lang.reflect.Array;
public final class HashCodeUtil
{
/**
* An initial value for a hashCode, to which is added contributions from fields. Using a non-zero value
* decreases collisons of hashCode values.
*/
public static final int SEED = 23;
/**
* booleans.
*
* @param aSeed
* the a seed
* @param aBoolean
* the a boolean
* @return the int
*/
public static int hash(int aSeed, boolean aBoolean)
{
return firstTerm(aSeed) + (aBoolean ? 1 : 0);
}
/**
* chars.
*
* @param aSeed
* the a seed
* @param aChar
* the a char
* @return the int
*/
public static int hash(int aSeed, char aChar)
{
return firstTerm(aSeed) + aChar;
}
/**
* ints.
*
* @param aSeed
* the a seed
* @param aInt
* the a int
* @return the int
*/
public static int hash(int aSeed, int aInt)
{
/*
* Implementation Note Note that byte and short are handled by this method, through implicit conversion.
*/
return firstTerm(aSeed) + aInt;
}
/**
* longs.
*
* @param aSeed
* the a seed
* @param aLong
* the a long
* @return the int
*/
public static int hash(int aSeed, long aLong)
{
return firstTerm(aSeed) + (int) (aLong ^ (aLong >>> 32));
}
/**
* floats.
*
* @param aSeed
* the a seed
* @param aFloat
* the a float
* @return the int
*/
public static int hash(int aSeed, float aFloat)
{
return hash(aSeed, Float.floatToIntBits(aFloat));
}
/**
* doubles.
*
* @param aSeed
* the a seed
* @param aDouble
* the a double
* @return the int
*/
public static int hash(int aSeed, double aDouble)
{
return hash(aSeed, Double.doubleToLongBits(aDouble));
}
/**
* aObject 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.
*
* @param aSeed
* the a seed
* @param aObject
* the a object
* @return the int
*/
public static int hash(int aSeed, Object aObject)
{
int result = aSeed;
if (aObject == null)
{
result = hash(result, 0);
}
else if (!isArray(aObject))
{
result = hash(result, aObject.hashCode());
}
else
{
int length = Array.getLength(aObject);
for (int idx = 0; idx < length; ++idx)
{
Object item = Array.get(aObject, idx);
// recursive call!
result = hash(result, item);
}
}
return result;
}
// / PRIVATE ///
private static final int fODD_PRIME_NUMBER = 37;
/**
* First term.
*
* @param aSeed
* the a seed
* @return the int
*/
private static int firstTerm(int aSeed)
{
return fODD_PRIME_NUMBER * aSeed;
}
/**
* Checks if is array.
*
* @param aObject
* the a object
* @return true, if is array
*/
private static boolean isArray(Object aObject)
{
return aObject.getClass().isArray();
}
}