hlt.language.util

Class Misc

java.lang.Object

hlt.language.util.Misc

public class Misc
extends java.lang.Object

This class implements a few of useful methods.

Constructor Summary

Constructors

Constructor and Description
Misc()

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	equals(java.lang.Object o1, java.lang.Object o2) Returns true iff the two specified, possibly null, objects are equal.
static int	hash(java.lang.String s) Computes a hash code for the given string using a variant of the algorithm due to P.J.Weinberger described in the Dragon Book.
static int	hashCode(double x) Returns a hash code for the specified double.
static int	hashCode(java.lang.Object object) Returns the hashcode of the specified, possibly null object.

Methods inherited from class java.lang.Object

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

Constructor Detail

Misc

public Misc()

Method Detail

equals

public static final boolean equals(java.lang.Object o1,
             java.lang.Object o2)

Returns true iff the two specified, possibly null, objects are equal.

hashCode

public static final int hashCode(java.lang.Object object)

Returns the hashcode of the specified, possibly null object.

hashCode

public static final int hashCode(double x)

Returns a hash code for the specified double.

hash

public static final int hash(java.lang.String s)

Computes a hash code for the given string using a variant of the algorithm due to P.J.Weinberger described in the Dragon Book. The difference is that each character is weighed by a function of its position and the string's length. This has for effect to improve scatterring of identifiers differring by a suffix, which is a rather common situation in program texts (e.g.i1, i2, i3, ...). As always, this hash code is supposed to work best when the size of the hash table (i.e. the number to '%' this code with) is prime.