Package io.netty.util

Class ConstantPool<T extends Constant<T>>

java.lang.Object

io.netty.util.ConstantPool<T>

Type Parameters:

T - the type of the constant

public abstract class ConstantPool<T extends Constant<T>>
extends Object

A pool of Constants.

Field Summary

Fields

Modifier and Type	Field	Description
private final ConcurrentMap<String,T>	constants
private final AtomicInteger	nextId

Constructor Summary

Constructors

Constructor	Description
ConstantPool()

Method Summary

Modifier and Type	Method	Description
private T	createOrThrow(String name)	Creates constant by name or throws exception.
boolean	exists(String name)	Returns true if a AttributeKey exists for the given name.
private T	getOrCreate(String name)	Get existing constant by name or creates new one if not exists.
protected abstract T	newConstant(int id, String name)
T	newInstance(String name)	Creates a new Constant for the given name or fail with an IllegalArgumentException if a Constant for the given name exists.
final int	nextId()	Deprecated.
T	valueOf(Class<?> firstNameComponent, String secondNameComponent)	Shortcut of valueOf(firstNameComponent.getName() + "#" + secondNameComponent).
T	valueOf(String name)	Returns the Constant which is assigned to the specified name.

Methods inherited from class java.lang.Object

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

Field Details

constants

private final ConcurrentMap<String,T extends Constant<T>> constants

nextId

private final AtomicInteger nextId

Constructor Details

ConstantPool

public ConstantPool()

Method Details

valueOf

public T valueOf(Class<?> firstNameComponent,
 String secondNameComponent)

Shortcut of valueOf(firstNameComponent.getName() + "#" + secondNameComponent).

valueOf

public T valueOf(String name)

Returns the Constant which is assigned to the specified name. If there's no such Constant, a new one will be created and returned. Once created, the subsequent calls with the same name will always return the previously created one (i.e. singleton.)

Parameters:

name - the name of the Constant

getOrCreate

private T getOrCreate(String name)

Get existing constant by name or creates new one if not exists. Threadsafe

Parameters:

name - the name of the Constant

exists

public boolean exists(String name)

Returns true if a AttributeKey exists for the given name.

newInstance

public T newInstance(String name)

Creates a new Constant for the given name or fail with an IllegalArgumentException if a Constant for the given name exists.

createOrThrow

private T createOrThrow(String name)

Creates constant by name or throws exception. Threadsafe

Parameters:

name - the name of the Constant

newConstant

protected abstract T newConstant(int id,
 String name)

nextId

@Deprecated
public final int nextId()

Deprecated.