gnu.mapping
Class Namespace

java.lang.Object
  gnu.mapping.Namespace

All Implemented Interfaces:

HasNamedParts, java.io.Externalizable, java.io.Serializable

Direct Known Subclasses:

ClassNamespace, LispPackage, XmlNamespace

public class Namespace
extends java.lang.Object
implements java.io.Externalizable, HasNamedParts

A mapping from strings ("print names") to Symbols. Namespaces are normally named and can be accessed from a global table. They correspond to Common Lisp "packages" (which are implemented using gnu.kawa.lispexpr.LispPackage, which extends Namespace). A Namespace is a "weak" mapping in the sense that a Symbol can be garbage collected even though it is referenced from a Namespace.

See Also:

Serialized Form

Field Summary

static Namespace	EmptyNamespace The Namespace with the empty name.
protected static java.util.Hashtable	nsTable Map namepsace names (and nick-names) to Namespaces.
protected java.lang.String	prefix
protected gnu.mapping.SymbolRef[]	table

Constructor Summary

Namespace()

Namespace(int capacity)

Method Summary

Symbol	add(Symbol sym, int hash)
java.lang.Object	get(java.lang.String key)
static Namespace	getDefault()
static Symbol	getDefaultSymbol(java.lang.String name)
static Namespace	getInstance(java.lang.String name)
java.lang.String	getName() Get the name of this Namespace.
Symbol	getSymbol(java.lang.String key) Get a Symbol matching the given name.
boolean	isConstant(java.lang.String key)
Symbol	lookup(java.lang.String key) Get a Symbol matching the given name.
Symbol	lookup(java.lang.String key, int hash, boolean create)
protected Symbol	lookupInternal(java.lang.String key, int hash)
static Namespace	make(java.lang.String name)
static Namespace	make(java.lang.String uri, java.lang.String prefix)
static Namespace	makeUnknownNamespace(java.lang.String prefix) Create a "placeholder" for a namespace with a known prefix but unknown uri.
void	readExternal(java.io.ObjectInput in)
java.lang.Object	readResolve()
protected void	rehash()
boolean	remove(Symbol symbol)
void	setName(java.lang.String name) Set the name of this Namespace.
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Detail

nsTable

protected static final java.util.Hashtable nsTable

Map namepsace names (and nick-names) to Namespaces.

EmptyNamespace

public static final Namespace EmptyNamespace

The Namespace with the empty name.

prefix

protected java.lang.String prefix

table

protected gnu.mapping.SymbolRef[] table

Constructor Detail

Namespace

public Namespace()

Namespace

public Namespace(int capacity)

Method Detail

getName

public final java.lang.String getName()

Get the name of this Namespace.

setName

public final void setName(java.lang.String name)

Set the name of this Namespace.

getDefault

public static Namespace getDefault()

getDefaultSymbol

public static Symbol getDefaultSymbol(java.lang.String name)

make

public static Namespace make(java.lang.String name)

getInstance

public static Namespace getInstance(java.lang.String name)

make

public static Namespace make(java.lang.String uri,
                             java.lang.String prefix)

makeUnknownNamespace

public static Namespace makeUnknownNamespace(java.lang.String prefix)

Create a "placeholder" for a namespace with a known prefix but unknown uri.

See Also:

Symbol.makeWithUnknownNamespace(java.lang.String, java.lang.String)

get

public java.lang.Object get(java.lang.String key)

Specified by:

get in interface HasNamedParts

isConstant

public boolean isConstant(java.lang.String key)

Specified by:

isConstant in interface HasNamedParts

getSymbol

public Symbol getSymbol(java.lang.String key)

Get a Symbol matching the given name. Creates a new Symbol if one is not found. Equivalent to Common Lisp's "intern" function.

lookup

public Symbol lookup(java.lang.String key)

Get a Symbol matching the given name. Returns null if one is not found.

lookupInternal

protected final Symbol lookupInternal(java.lang.String key,
                                      int hash)

add

public Symbol add(Symbol sym,
                  int hash)

lookup

public Symbol lookup(java.lang.String key,
                     int hash,
                     boolean create)

remove

public boolean remove(Symbol symbol)

rehash

protected void rehash()

writeExternal

public void writeExternal(java.io.ObjectOutput out)
                   throws java.io.IOException

Specified by:

writeExternal in interface java.io.Externalizable

Throws:

java.io.IOException

readExternal

public void readExternal(java.io.ObjectInput in)
                  throws java.io.IOException,
                         java.lang.ClassNotFoundException

Specified by:

readExternal in interface java.io.Externalizable

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readResolve

public java.lang.Object readResolve()
                             throws java.io.ObjectStreamException

Throws:

java.io.ObjectStreamException

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object