Package gnu.mapping

Class Namespace

java.lang.Object

java.util.AbstractMap<String,Symbol>

gnu.kawa.util.AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

gnu.mapping.Namespace

All Implemented Interfaces:

HasNamedParts, Externalizable, Serializable, Map<String,Symbol>

Direct Known Subclasses:

ClassNamespace, LispPackage, XmlNamespace

public class Namespace
extends AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>
implements 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

Nested Class Summary

Nested classes/interfaces inherited from class java.util.AbstractMap

AbstractMap.SimpleEntry<K,V>, AbstractMap.SimpleImmutableEntry<K,V>

Nested classes/interfaces inherited from interface java.util.Map

Map.Entry<K,V>

Field Summary

Fields

Modifier and Type	Field	Description
static final Namespace	EmptyNamespace	The Namespace with the empty name.
protected static final Hashtable	nsTable	Map namepsace names (and nick-names) to Namespaces.
protected String	prefix
static final String	UNKNOWN_NAMESPACE

Fields inherited from class gnu.kawa.util.AbstractHashTable

DEFAULT_INITIAL_SIZE, mask, num_bindings, table

Constructor Summary

Constructors

Modifier	Constructor	Description
	Namespace()
protected	Namespace(int capacity)

Method Summary

Modifier and Type	Method	Description
Symbol	add(Symbol sym, int hash)
protected gnu.mapping.SymbolRef[]	allocEntries(int n)	Allocate Entry[n].
static Namespace	create()
static Namespace	create(int capacity)
Symbol	get(Object key, Symbol defaultValue)	Find value for given key.
Object	get(String key)
static Namespace	getDefault()
static Symbol	getDefaultSymbol(String name)
protected int	getEntryHashCode(gnu.mapping.SymbolRef entry)	Extract hash-code from Entry.
protected gnu.mapping.SymbolRef	getEntryNext(gnu.mapping.SymbolRef entry)	Extract next Entry in same hash-bucket.
final String	getName()	Get the name of this Namespace.
final String	getPrefix()
Symbol	getSymbol(String key)	Get a Symbol matching the given name.
boolean	isConstant(String key)
boolean	isUnknownNamespace()	A namespace with known prefix but unknown uri.
Symbol	lookup(String key)	Get a Symbol matching the given name.
Symbol	lookup(String key, int hash, boolean create)
protected final Symbol	lookupInternal(String key, int hash)	Search for an existing Symbol with the give name.
protected gnu.mapping.SymbolRef	makeEntry(String key, int hash, Symbol value)	Allocate a new node in the hash table.
static Namespace	makeUnknownNamespace(String prefix)	Create a "placeholder" for a namespace with a known prefix but unknown uri.
void	readExternal(ObjectInput in)
Object	readResolve()
boolean	remove(Symbol symbol)
protected void	setEntryNext(gnu.mapping.SymbolRef entry, gnu.mapping.SymbolRef next)	Set next Entry in same hash-bucket.
final void	setName(String name)	Set the name of this Namespace.
String	toString()
static Namespace	valueOf()
static Namespace	valueOf(String name)	Return Namespace with the given name (namespace-URI).
static Namespace	valueOf(String uri, SimpleSymbol prefix)
static Namespace	valueOf(String uri, String prefix)
static Namespace	valueOfNoCreate(String name)	Return Namespace with the given name (namespace-URI), if it exists.
void	writeExternal(ObjectOutput out)

Methods inherited from class gnu.kawa.util.AbstractHashTable

clear, entrySet, get, getNode, getOrDefault, hash, hashToIndex, matches, matches, put, put, rehash, remove, size

Methods inherited from class java.util.AbstractMap

clone, containsKey, containsValue, equals, hashCode, isEmpty, keySet, putAll, values

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, forEach, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Details

nsTable

protected static final Hashtable nsTable

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

EmptyNamespace

public static final Namespace EmptyNamespace

The Namespace with the empty name.

prefix

protected String prefix

UNKNOWN_NAMESPACE

public static final String UNKNOWN_NAMESPACE

Constructor Details

Namespace

public Namespace()

Namespace

protected Namespace(int capacity)

Method Details

getName

public final String getName()

Get the name of this Namespace.

setName

public final void setName(String name)

Set the name of this Namespace.

getPrefix

public final String getPrefix()

create

public static Namespace create(int capacity)

create

public static Namespace create()

getDefault

public static Namespace getDefault()

getDefaultSymbol

public static Symbol getDefaultSymbol(String name)

valueOf

public static Namespace valueOf()

valueOf

public static Namespace valueOf(String name)

Return Namespace with the given name (namespace-URI). Create it if needed.

valueOfNoCreate

public static Namespace valueOfNoCreate(String name)

Return Namespace with the given name (namespace-URI), if it exists. Return null if no such namespace exists.

valueOf

public static Namespace valueOf(String uri,
 String prefix)

valueOf

public static Namespace valueOf(String uri,
 SimpleSymbol prefix)

isUnknownNamespace

public boolean isUnknownNamespace()

A namespace with known prefix but unknown uri.

makeUnknownNamespace

public static Namespace makeUnknownNamespace(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 Object get(String key)

Specified by:

get in interface HasNamedParts

isConstant

public boolean isConstant(String key)

Specified by:

isConstant in interface HasNamedParts

getSymbol

public Symbol getSymbol(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(String key)

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

lookupInternal

protected final Symbol lookupInternal(String key,
 int hash)

Search for an existing Symbol with the give name.

Parameters:

key - String - does not need to be interned.

add

public Symbol add(Symbol sym,
 int hash)

get

public Symbol get(Object key,
 Symbol defaultValue)

Description copied from class: AbstractHashTable

Find value for given key. Return defaultValue if not found.

Overrides:

get in class AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

lookup

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

remove

public boolean remove(Symbol symbol)

getEntryHashCode

protected int getEntryHashCode(gnu.mapping.SymbolRef entry)

Description copied from class: AbstractHashTable

Extract hash-code from Entry.

Specified by:

getEntryHashCode in class AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

getEntryNext

protected gnu.mapping.SymbolRef getEntryNext(gnu.mapping.SymbolRef entry)

Extract next Entry in same hash-bucket.

Specified by:

getEntryNext in class AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

setEntryNext

protected void setEntryNext(gnu.mapping.SymbolRef entry,
 gnu.mapping.SymbolRef next)

Set next Entry in same hash-bucket.

Specified by:

setEntryNext in class AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

allocEntries

protected gnu.mapping.SymbolRef[] allocEntries(int n)

Allocate Entry[n].

Specified by:

allocEntries in class AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

makeEntry

protected gnu.mapping.SymbolRef makeEntry(String key,
 int hash,
 Symbol value)

Description copied from class: AbstractHashTable

Allocate a new node in the hash table.

Specified by:

makeEntry in class AbstractHashTable<gnu.mapping.SymbolRef,String,Symbol>

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

readResolve

public Object readResolve()
                   throws ObjectStreamException

Throws:

ObjectStreamException

toString

public String toString()

Overrides:

toString in class AbstractMap<String,Symbol>