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Jena is a Java framework for building Semantic Web applications. It provides a programmatic environment for RDF, RDFS and OWL, SPARQL and includes a rule-based inference engine.
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/*
(c) Copyright 2005, 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
All rights reserved - see end of file.
$Id: StageElement.java,v 1.1 2009/06/29 08:55:45 castagna Exp $
*/
package com.hp.hpl.jena.graph.query;
/**
Class used internally by PatternStage to express the notion of "the
runnable next component in this stage".
@author kers
*/
public abstract class StageElement
{
public abstract void run( Domain current );
/**
A PutBindings is created with a domain sink and, whenever it is run,
puts a copy of the current domain down the sink.
*/
public static final class PutBindings extends StageElement
{
protected final Pipe sink;
public PutBindings( Pipe sink )
{ this.sink = sink; }
@Override
public final void run( Domain current )
{ sink.put( current.copy() ); }
}
/**
A FindTriples runs match-and-next over all the triples returned
by its finder.
*/
public static final class FindTriples extends StageElement
{
protected final Matcher matcher;
protected final Applyer finder;
protected final StageElement next;
protected final Stage stage;
public FindTriples( Stage stage, Matcher matcher, Applyer finder, StageElement next )
{ this.stage = stage; this.matcher = matcher; this.finder = finder; this.next = next; }
@Override
public final void run( Domain current )
{ if (stage.stillOpen) finder.applyToTriples( current, matcher, next ); }
}
/**
A RunValuatorSet is created with a ValuatorSet and a next StageElement;
whenever it is run, it evaluates the ValuatorSet and only if that
answers true does it run the next StageElement.
*/
public static final class RunValuatorSet extends StageElement
{
protected final ValuatorSet s;
protected final StageElement next;
public RunValuatorSet( ValuatorSet s, StageElement next )
{ this.s = s; this.next = next; }
@Override
public final void run( Domain current )
{ if (s.evalBool( current )) next.run( current ); }
}
}
/*
* (c) Copyright 2005, 2006, 2007, 2008, 2009 Hewlett-Packard Development Company, LP
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/