content: /*
   * Copyright (c) 2011, 3 Round Stones Inc. Some rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * - Redistributions of source code must retain the above copyright notice, this
   *   list of conditions and the following disclaimer.
   * - 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. 
   * - Neither the name of the openrdf.org nor the names of its contributors may
   *   be used to endorse or promote products derived from this software without
   *   specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR CONTRIBUTORS 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 org.callimachusproject.sail.keyword;
  
  import org.openrdf.model.Literal;
  import org.openrdf.model.Resource;
  import org.openrdf.model.URI;
  import org.openrdf.model.Value;
  import org.openrdf.model.ValueFactory;
  import org.openrdf.sail.SailConnection;
  import org.openrdf.sail.SailException;
  import org.openrdf.sail.UpdateContext;
  import org.openrdf.sail.helpers.SailConnectionWrapper;
  import org.openrdf.sail.inferencer.InferencerConnection;
  
  /**
   * Inferres keyword:phone property from properties in
   * META-INF/org.callimachusproject.sail.keyword.property.
   * 
   * @author James Leigh
   * 
   */
  public class KeywordConnection extends SailConnectionWrapper {
  	private final PhoneHelper helper;
  	private final KeywordSail sail;
  	private final ValueFactory vf;
  	private final Resource graph;
  	private final URI property;
  	private final InferencerConnection infer;
  
  	protected KeywordConnection(KeywordSail sail,
  			SailConnection delegate, PhoneHelper keyword)
  			throws SailException {
  		super(delegate);
  		this.sail = sail;
  		this.helper = keyword;
  		this.vf = sail.getValueFactory();
  		this.graph = sail.getPhoneGraph();
  		this.property = sail.getPhoneProperty();
  		if (delegate instanceof InferencerConnection) {
  			infer = (InferencerConnection) delegate;
  		} else {
  			infer = null;
  		}
  	}
  
  	@Override
  	public String toString() {
  		return getWrappedConnection().toString();
  	}
  
  	@Override
  	public void addStatement(Resource subj, URI pred, Value obj,
  			Resource... contexts) throws SailException {
  		super.addStatement(subj, pred, obj, contexts);
  		if (sail.isIndexedProperty(pred)) {
  			index(null, subj, obj);
  		}
  	}
  
  	@Override
  	public void addStatement(UpdateContext modify, Resource subj, URI pred,
  			Value obj, Resource... contexts) throws SailException {
  		super.addStatement(modify, subj, pred, obj, contexts);
  		if (sail.isIndexedProperty(pred)) {
  			index(modify, subj, obj);
  		}
  	}
  
  	protected void index(UpdateContext uc, Resource subj, Value obj) throws SailException {
  		for (String s : helper.phones(obj.stringValue())) {
  			Literal lit = vf.createLiteral(s);
  			if (infer == null && uc == null) {
  				super.addStatement(subj, property, lit, graph);
  			} else if (infer == null) {
  				super.addStatement(uc, subj, property, lit, graph);
  			} else {
  				infer.addInferredStatement(subj, property, lit, graph);
  			}
  		}
  	}
  
  }
  