org.apache.fop.util

Class CompareUtil

java.lang.Object

org.apache.fop.util.CompareUtil

public final class CompareUtil
extends Object

A utility class that provides helper methods for implementing equals and hashCode.

Method Summary

Methods

Modifier and Type	Method and Description
static boolean	equal(double n1, double n2) Compares two numbers for equality.
static boolean	equal(Object o1, Object o2) Compares two objects for equality.
static int	getHashCode(double number) Returns a hash code for the given number.
static int	getHashCode(Object object) Returns the hash code of the given object.

Methods inherited from class java.lang.Object

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

Method Detail

equal

public static boolean equal(Object o1,
            Object o2)

Compares two objects for equality. In order to prevent lock-ordering deadlocks the following strategy is used: when two non null objects are passed to the method, the comparison is done by calling the Object.equals(Object) method of the object with the lower hash code (System.identityHashCode(Object)); in the rare case that two different objects have the same hash code, a lock is used.

Parameters:

o1 - an object

o2 - another object

Returns:

true if either o1 and o2 are null or if o1.equals(o2)

getHashCode

public static int getHashCode(Object object)

Returns the hash code of the given object.

Parameters:

object - an object

Returns:

object.hashCode(), or 0 if object is null

equal

public static boolean equal(double n1,
            double n2)

Compares two numbers for equality. Uses the same comparison algorithm as the Double.equals(Object) method.

Parameters:

n1 - a number

n2 - another number

Returns:

true if the two numbers are equal, false otherwise

getHashCode

public static int getHashCode(double number)

Returns a hash code for the given number. Applies the same algorithm as the Double.hashCode() method.

Parameters:

number - a number

Returns:

a hash code for that number