prolog.implementation
Class QueryList

java.lang.Object
  |
  +--prolog.implementation.QueryList

All Implemented Interfaces:

IQueryList

public class QueryList

extends java.lang.Object

implements IQueryList

A query list stores statementtrees having a Query as root

prolog:

?-myQuery1(X,Y):-superman1(Y,X),superwomen1(X,Y).

?-myQuery2(X,Y):-superman2(Y,X),superwomen2(X,Y).

In this example, the two queries "myQuery1" and "myQuery2" are stored in a querylist

Field Summary

protected java.util.List	listeners list of IQueryListListeners
protected java.util.List	queries the list storing the queries

Constructor Summary

QueryList()
constructor

Method Summary

void	addListener(IQueryListListener l) registers a listener
void	addQuery(IFact f) adds the given query to the fact list
void	clear() clears this query list
protected void	fireChange() fires a content changed notify
void	genXml(java.io.Writer out, ISymbolTable table) generates xml describing this object
java.util.Iterator	getQueries() returns a iterator over all stored queries
void	removeListener(IQueryListListener l) unregisters a listener
java.lang.String	toString(ISymbolTable table) returns a string representation of this class

Methods inherited from class java.lang.Object

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

Field Detail

listeners

protected java.util.List listeners

list of IQueryListListeners

queries

protected java.util.List queries

the list storing the queries

Constructor Detail

QueryList

public QueryList()

constructor

Method Detail

clear

public void clear()

clears this query list

Specified by:

clear in interface IQueryList

getQueries

public java.util.Iterator getQueries()

returns a iterator over all stored queries

Specified by:

getQueries in interface IQueryList

addQuery

public void addQuery(IFact f)

adds the given query to the fact list

Specified by:

addQuery in interface IQueryList

toString

public java.lang.String toString(ISymbolTable table)

returns a string representation of this class

Specified by:

toString in interface IQueryList

genXml

public void genXml(java.io.Writer out,
                   ISymbolTable table)
            throws java.io.IOException

generates xml describing this object

Specified by:

genXml in interface IQueryList

Parameters:

out - the writer to append the xml

table - the symboltable to decode the symbols

Throws:

java.io.IOException -

addListener

public void addListener(IQueryListListener l)

registers a listener

removeListener

public void removeListener(IQueryListListener l)

unregisters a listener

fireChange

protected void fireChange()

fires a content changed notify