Package com.semedy.reasoner.rewriter

Class FullFolderRewriter

java.lang.Object

com.semedy.reasoner.rewriter.FullFolderRewriter

All Implemented Interfaces:

Rewriter

public class FullFolderRewriter
extends Object
implements Rewriter

folds rules. For instance given two rules: p(?X,?Y) :- q(?X),s(?X),r(?X,?Y). r(?U) :- q(?U),t(?U),r(?U,?Y).
They can be replaced by the following rules:
u(?X,?Y) :- q(?X),r(?X,?Y). // outfolded rule p(?X,?Y) :- u(?X,?Y),s(?X). r(?U) :- u(?U,?Y),t(?U).
The first set of rules needs 4 joins to be evaluated, the
second set of rules needs 3 joins only to be evaluated

Author:

angele

Constructor Summary

Constructors

Constructor	Description
FullFolderRewriter()

Method Summary

Modifier and Type	Method	Description
String	getDescription()	get a description for the rewriter
String	getName()	get the name of a rewriter
boolean	readsSymbolTable()	indicates whether rewriter has to read the symbol table
IntensionalDB	rewrite(IntensionalDB idb, ExtensionalDB[] edbs, SymbolTable symbolTable, ExternalDataTypeProvider datatypes, Configuration config)	applies the rewriter to a set of rules
void	setBuiltinProvider(BuiltinProvider builtinProvider)	sets the built-in provider for the rewriter
void	setProperties(Properties prp)	set properties
void	setStatistics(SystemMonitor statistics)	adds a system monitor which has run time data about rules.
boolean	writesSymbolTable()	indicates whether rewriter modifies the symbol table

Methods inherited from class java.lang.Object

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

Constructor Details

FullFolderRewriter

public FullFolderRewriter()

Method Details

getName

public String getName()

Description copied from interface: Rewriter

get the name of a rewriter

Specified by:

getName in interface Rewriter

Returns:

getDescription

public String getDescription()

Description copied from interface: Rewriter

get a description for the rewriter

Specified by:

getDescription in interface Rewriter

Returns:

readsSymbolTable

public boolean readsSymbolTable()

Description copied from interface: Rewriter

indicates whether rewriter has to read the symbol table

Specified by:

readsSymbolTable in interface Rewriter

Returns:

writesSymbolTable

public boolean writesSymbolTable()

Description copied from interface: Rewriter

indicates whether rewriter modifies the symbol table

Specified by:

writesSymbolTable in interface Rewriter

Returns:

setBuiltinProvider

public void setBuiltinProvider(BuiltinProvider builtinProvider)

Description copied from interface: Rewriter

sets the built-in provider for the rewriter

Specified by:

setBuiltinProvider in interface Rewriter

rewrite

public IntensionalDB rewrite(IntensionalDB idb,
 ExtensionalDB[] edbs,
 SymbolTable symbolTable,
 ExternalDataTypeProvider datatypes,
 Configuration config)
                      throws InterruptedException,
RewriterException,
IOException

Description copied from interface: Rewriter

applies the rewriter to a set of rules

Specified by:

rewrite in interface Rewriter

Parameters:

idb - , intensional database

edbs - , extensional databases, the last one is used for snapshot transaction data

symbolTable - , symbol table

datatypes - , the external datatypes

config - , configuration

Returns:

Throws:

InterruptedException

RewriterException

IOException

setStatistics

public void setStatistics(SystemMonitor statistics)

Description copied from interface: Rewriter

adds a system monitor which has run time data about rules.

Specified by:

setStatistics in interface Rewriter

setProperties

public void setProperties(Properties prp)

Description copied from interface: Rewriter

set properties

Specified by:

setProperties in interface Rewriter