Package org.jruby

Class FlagRegistry

java.lang.Object

org.jruby.FlagRegistry

public class FlagRegistry
extends Object

This class serves as a registry of all bit flags we use on JRuby objects. In order to maximally use our bit flags and prevent overlap between ancestors and dependents, this class registers flags on a first-come, first-served basis using previous flags registered for ancestor classes as a base line for new flags in a descendant. Because of the first-come, first-served nature, the most general types will need to register their flags first. This guarantees all bit flags from the progenitor on down will be packed tightly while avoiding overlaps.

Constructor Summary

Constructors

Constructor	Description
FlagRegistry()

Method Summary

Modifier and Type	Method	Description
int	newFlag(Class klass)	Register a new flag for the given class.
void	printFlags()

Methods inherited from class java.lang.Object

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

Constructor Details

FlagRegistry

public FlagRegistry()

Method Details

newFlag

public int newFlag(Class klass)

Register a new flag for the given class. The bit index for the new flag will be calculated at runtime, by walking parent classes and looking for previously-registered flags. Ancestors should register all their flags before descendants (which means they should not be registered in a static initializer unless the parent is known to have fully run its own static initializers).

Parameters:

klass - the class for which to register a new flag

Returns:

an integer with the new flag bit set

printFlags

public void printFlags()