jpl

Class String_JPL

java.lang.Object

jpl.Term

jpl.String_JPL

public class String_JPL
extends Term

A String is a Term with a java.lang.String value. Use this class to represent Prolog strings.

 jpl.String s = new jpl.String( "Haddock's Eyes" );
 

Copyright (C) 1998 Fred Dushin

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Library Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library Public License for more details.

Version:

$Revision: 1.1.1.1 $

Author:

Fred Dushin

Constructor Summary

Constructors

Constructor and Description
String_JPL(String value) A String holds a java.lang.String and represents a Prolog String, whose internal representation may vary across Prolog implementations.

Method Summary

Modifier and Type	Method and Description
protected void	computeSubstitution(Hashtable bindings, Hashtable vars) Nothing needs to be done if the Term is an Atom.
String	debugString()
boolean	equals(Object obj) Two Strings are equal if their values are equal
protected static Term	from_term_t(Hashtable vars, term_t term) Converts a term_t to a String.
protected void	put(Hashtable var_table, term_t term) To put an String in a term, we put the characters of the String into the term_t.
String	toString()
String	value()

Methods inherited from class jpl.Term

computeSubstitutions, debugString, from_term_t, terms_equals, terms_to_term_ts, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

String_JPL

public String_JPL(String value)

A String holds a java.lang.String and represents a Prolog String, whose internal representation may vary across Prolog implementations.

Parameters:

value - the java.lang.String value of this String.

Method Detail

value

public final String value()

Returns:

the String's value

put

protected final void put(Hashtable var_table,
                         term_t term)

To put an String in a term, we put the characters of the String into the term_t.

Specified by:

put in class Term

Parameters:

var_table - A Hashtable containing term_t's that are bound to (have packed in) Prolog variables as elements. The Elements are keyed by jpl.Variable instances. Cf. the put() implementation in the Variable class.

term - A (previously created) term_t which is to be packed with a Prolog term-type appropriate to the Term type (e.g., Atom, Variable, Compound, etc.) on which the method is invoked.)

from_term_t

protected static Term from_term_t(Hashtable vars,
                                  term_t term)

Converts a term_t to a String. Assuming the term is an Prolog String, we just create a new String using the characters in the Prolog String.

Parameters:

term - The term_t to convert

Returns:

A new String

computeSubstitution

protected final void computeSubstitution(Hashtable bindings,
                                         Hashtable vars)

Nothing needs to be done if the Term is an Atom.

Specified by:

computeSubstitution in class Term

Parameters:

table - table holding Term substitutions, keyed on Variables.

toString

public String toString()

Overrides:

toString in class Object

debugString

public String debugString()

Specified by:

debugString in class Term

equals

public final boolean equals(Object obj)

Two Strings are equal if their values are equal

Overrides:

equals in class Object

Parameters:

obj - The Object to compare

Returns:

true if the Object satisfies the above condition