/** Copyright (c) 2009, Queensland University of Technology All 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 University of Pittsburgh 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 qut.beagle; import pitt.search.semanticvectors.CompoundVectorBuilder; import pitt.search.semanticvectors.FlagConfig; import pitt.search.semanticvectors.LuceneUtils; import pitt.search.semanticvectors.VectorSearcher; import pitt.search.semanticvectors.VectorStore; import pitt.search.semanticvectors.ZeroVectorException; import pitt.search.semanticvectors.vectors.RealVector; import pitt.search.semanticvectors.vectors.Vector; import pitt.search.semanticvectors.vectors.VectorUtils; /** * This class extends VectorSeracher and is used to return a query vector * for searching and also to score vector comparisons. * * @author Lance De Vine */ /* * This class extends VectorSearcher and is used to construct * query vectors for searching. * * @author Lance De Vine */ public class BeagleVectorSearcher extends VectorSearcher { Vector queryVector; /** * @param queryVecStore Vector store to use for query generation. * @param searchVecStore The vector store to search. * @param luceneUtils LuceneUtils object to use for query weighting. (May be null.) * @param queryTerms Terms that will be parsed into a query expression. */ public BeagleVectorSearcher(VectorStore queryVecStore, VectorStore searchVecStore, LuceneUtils luceneUtils, FlagConfig flagConfig, String[] queryTerms) throws ZeroVectorException { super(queryVecStore, searchVecStore, luceneUtils, flagConfig); BeagleCompoundVecBuilder bcvb = new BeagleCompoundVecBuilder(flagConfig); queryVector = new RealVector(bcvb.getNGramQueryVector(queryVecStore, queryTerms)); if (this.queryVector.isZeroVector()) { throw new ZeroVectorException("Query vector is zero ... no results."); } } public double getScore(Vector testVector) { return this.queryVector.measureOverlap(testVector); } }