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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2006-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.runtime;
/**
* @author Gilles Dubochet
* @author Martin Odersky
* @version 1.2 */
public class Comparator {
/** A rich implementation of the equals method that overrides the default
* equals because Java's boxed primitives are utterly broken. This equals
* is inserted instead of a normal equals by the Scala compiler (in the
* ICode phase, method <code>genEqEqPrimitive</code>) only when either
* side of the comparison is a subclass of <code>AnyVal</code>, of
* <code>java.lang.Number</code>, of <code>java.lang.Character</code> or
* is exactly <code>Any</code> or <code>AnyRef</code>, but when both sides
* have different types. */
public static boolean equals(Object a, Object b) {
if (a == null)
return b == null;
if (b == null)
return false;
if (a.equals(b))
return true;
final long left =
(a instanceof Integer) ? ((Integer)a).intValue() :
(a instanceof Character) ? ((Character)a).charValue() :
(a instanceof Long) ? ((Long)a).longValue() :
(a instanceof Byte) ? ((Byte)a).byteValue() :
((Short)a).shortValue();
final long right =
(b instanceof Integer) ? ((Integer)b).intValue() :
(b instanceof Character) ? ((Character)b).charValue() :
(b instanceof Long) ? ((Long)b).longValue() :
(b instanceof Byte) ? ((Byte)b).byteValue() :
((Short)b).shortValue();
return left == right;
}
}
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