Package com.hp.gloze.extension

Source Code of com.hp.gloze.extension.Reify

/*
*  (c) Copyright Hewlett-Packard Company 2001 - 2009
*  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.
*/

package com.hp.gloze.extension;

import com.hp.hpl.jena.graph.Node;
import com.hp.hpl.jena.graph.Reifier;
import com.hp.hpl.jena.graph.Triple;
import com.hp.hpl.jena.reasoner.InfGraph;
import com.hp.hpl.jena.reasoner.rulesys.BindingEnvironment;
import com.hp.hpl.jena.reasoner.rulesys.RuleContext;
import com.hp.hpl.jena.reasoner.rulesys.builtins.BaseBuiltin;
/**
* @author steven.a.battle@googlemail.com
*/
public class Reify extends BaseBuiltin {

  /* (non-Javadoc)
   * @see com.hp.hpl.jena.reasoner.rulesys.Builtin#getName()
   */
  public String getName() {
    return "reify";
  }
  /* (non-Javadoc)
   * @see com.hp.hpl.jena.reasoner.rulesys.Builtin#getArgLength()
   */
  public int getArgLength() {
    return 4;
  }
  /* (non-Javadoc)
   * @see com.hp.hpl.jena.reasoner.rulesys.Builtin#getURI()
   */
  public String getURI() {
    return "http://www.hp.com/gloze/extensions/reify";
  }
  /* (non-Javadoc)
   * @see com.hp.hpl.jena.reasoner.rulesys.Builtin#bodyCall(com.hp.hpl.jena.graph.Node[], int, com.hp.hpl.jena.reasoner.rulesys.RuleContext)
   */
  public boolean bodyCall(Node[] args, int length, RuleContext context) {
    BindingEnvironment env = context.getEnv();
    InfGraph graph = context.getGraph();
    Node s = env.getGroundVersion(args[0]);
    Node p = env.getGroundVersion(args[1]);
    Node o = env.getGroundVersion(args[2]);
    try {
      Triple t = Triple.create(s,p,o);
      Reifier r = graph.getReifier();
      Node a = Node.createAnon();
      r.reifyAs(a,t);
      env.bind(args[3],a);
      return true;
    } catch (Exception e) {
      return false;
    }
  }
 
  public void headAction(Node[] args, int length, RuleContext context) {
    BindingEnvironment env = context.getEnv();
    InfGraph graph = context.getGraph();
    Node s = env.getGroundVersion(args[0]);
    Node p = env.getGroundVersion(args[1]);
    Node o = env.getGroundVersion(args[2]);
    try {
      Triple t = Triple.create(s,p,o);
      context.add(t);
      Node a = Node.createAnon();
      Reifier r = graph.getReifier();
      r.reifyAs(a,t);
      env.bind(args[3],a);
    } catch (Exception e) {
      e.printStackTrace(System.err);
    }   
  }
}
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