gnu.expr
Class Keyword

java.lang.Object
  gnu.mapping.Symbol
      gnu.expr.Keyword

All Implemented Interfaces:

EnvironmentKey, Printable, java.io.Externalizable, java.io.Serializable, java.lang.Comparable

public class Keyword
extends Symbol
implements Printable, java.io.Externalizable

See Also:

Serialized Form

Field Summary

static Namespace

keywordNamespace

Fields inherited from class gnu.mapping.Symbol

FUNCTION, name, PLIST

Constructor Summary

Keyword()

Keyword(Namespace namespace, java.lang.String name)
Used for constructing literals (int gnu.expr.LitTable).

Method Summary

Symbol	asSymbol() Get the corresponding non-keyword symbol.
static boolean	isKeyword(java.lang.Object obj)
static Keyword	make(java.lang.String name) Create or find a Keyword with a given name (without final ':').
void	print(Consumer out)
void	readExternal(java.io.ObjectInput in)
java.lang.Object	readResolve()
static java.lang.Object	searchForKeyword(java.lang.Object[] vals, int offset, java.lang.Object keyword) Search vals[0:offset-1] for a keyword.
static java.lang.Object	searchForKeyword(java.lang.Object[] vals, int offset, java.lang.Object keyword, java.lang.Object dfault) Search vals[0:offset-1] for a keyword.
java.lang.String	toString()
void	writeExternal(java.io.ObjectOutput out)

Methods inherited from class gnu.mapping.Symbol

compareTo, equals, equals, getKeyProperty, getKeySymbol, getLocalName, getLocalPart, getName, getNamespace, getNamespaceURI, getPrefix, hasEmptyNamespace, hashCode, make, make, makeUninterned, makeWithUnknownNamespace, matches, matches, parse, setNamespace

Methods inherited from class java.lang.Object

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

Field Detail

keywordNamespace

public static final Namespace keywordNamespace

Constructor Detail

Keyword

public Keyword()

Keyword

public Keyword(Namespace namespace,
               java.lang.String name)

Used for constructing literals (int gnu.expr.LitTable).

Method Detail

asSymbol

public Symbol asSymbol()

Get the corresponding non-keyword symbol. Informally, the symbol corresponding to dropping the ':'.

make

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

Create or find a Keyword with a given name (without final ':').

Parameters:

name - the print-name of the desired Keyword

Returns:

a Keyword with the given name, newly created iff none such exist

isKeyword

public static boolean isKeyword(java.lang.Object obj)

toString

public final java.lang.String toString()

Overrides:

toString in class Symbol

print

public void print(Consumer out)

Specified by:

print in interface Printable

searchForKeyword

public static java.lang.Object searchForKeyword(java.lang.Object[] vals,
                                                int offset,
                                                java.lang.Object keyword)

Search vals[0:offset-1] for a keyword. Each key at vals[i] is followed by a value at keys[i+1]. (This is used to search for a keyword parameter in an argument list.)

Parameters:

vals - the list to search in

offset - the index in vals to start the search at

keyword - the keyword to search for

Returns:

vals[i+1] such that vals[i]==keyword (and (i-offset) is even and non-negative); if there is no such i, return Special.dfault.

searchForKeyword

public static java.lang.Object searchForKeyword(java.lang.Object[] vals,
                                                int offset,
                                                java.lang.Object keyword,
                                                java.lang.Object dfault)

Search vals[0:offset-1] for a keyword. Each key at vals[i] is followed by a value at keys[i+1]. (This is used to search for a keyword parameter in an argument list.)

Parameters:

vals - the list to search in

offset - the index in vals to start the search at

keyword - the keyword to search for

dfault - the value to return if there is no match

Returns:

vals[i+1] such that vals[i]==keyword (and (i-offset) is even and non-negative); if there is no such i, return dfault.

writeExternal

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

Specified by:

writeExternal in interface java.io.Externalizable

Overrides:

writeExternal in class Symbol

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

Overrides:

readExternal in class Symbol

Throws:

java.io.IOException

java.lang.ClassNotFoundException

readResolve

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

Overrides:

readResolve in class Symbol

Throws:

java.io.ObjectStreamException