ubc.cs.JLog.Parser
Class pParseStream

java.lang.Object
  ubc.cs.JLog.Parser.pParseStream

public class pParseStream
extends Object

The main parsing class that converts packets into their correspoding prolog terms. Used to process user queries, and consult a database. Directly or indirectly uses the pPreTokenizeStream, pTokenizeStream, and pPreParseStream.

Version:

%I%, %G%

Author:

Glendon Holst

Field Summary

protected jKnowledgeBase	database
protected ubc.cs.JLog.Parser.pPreParseStream	parser

Constructor Summary

pParseStream(Reader r, jKnowledgeBase kb, pPredicateRegistry pr, pOperatorRegistry or)

pParseStream(String s, jKnowledgeBase kb, pPredicateRegistry pr, pOperatorRegistry or)

Method Summary

jPredicateTerms	parseQuery() Parse the source stream as a query, producing a term representation.
jPredicateTerms	parseQuery(Hashtable assignments) Parse the source stream as a query, producing a term representation.
void	parseSource()
jTerm	parseTerm()
protected void	query(jPredicateTerms q)

Methods inherited from class java.lang.Object

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

Field Detail

parser

protected ubc.cs.JLog.Parser.pPreParseStream parser

database

protected jKnowledgeBase database

Constructor Detail

pParseStream

public pParseStream(String s,
                    jKnowledgeBase kb,
                    pPredicateRegistry pr,
                    pOperatorRegistry or)

pParseStream

public pParseStream(Reader r,
                    jKnowledgeBase kb,
                    pPredicateRegistry pr,
                    pOperatorRegistry or)

Method Detail

parseQuery

public jPredicateTerms parseQuery()

Parse the source stream as a query, producing a term representation.

Returns:

The jPredicateTerms instance representing the parsed query string.

parseQuery

public jPredicateTerms parseQuery(Hashtable assignments)

Parse the source stream as a query, producing a term representation.

Parameters:

assignments - A Hashtable representing variable names as keys, and their corresponding jTerm value. The keys must String types, and be valid variable names. Values must be jTerm objects (or sub-classes)

Returns:

The jPredicateTerms instance representing the parsed query string.

parseTerm

public jTerm parseTerm()

parseSource

public void parseSource()

query

protected void query(jPredicateTerms q)