+++ /dev/null
-package org.apache.lucene.search;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import java.io.IOException;
-import java.util.HashSet;
-import java.util.Set;
-
-import org.apache.lucene.index.Term;
-import org.apache.lucene.index.TermDocs;
-import org.apache.lucene.index.IndexReader;
-import org.apache.lucene.search.Explanation.IDFExplanation;
-import org.apache.lucene.util.ReaderUtil;
-import org.apache.lucene.util.ToStringUtils;
-
-/** A Query that matches documents containing a term.
- This may be combined with other terms with a {@link BooleanQuery}.
- */
-public class TermQuery extends Query {
- private Term term;
-
- private class TermWeight extends Weight {
- private final Similarity similarity;
- private float value;
- private float idf;
- private float queryNorm;
- private float queryWeight;
- private IDFExplanation idfExp;
- private final Set<Integer> hash;
-
- public TermWeight(Searcher searcher)
- throws IOException {
- this.similarity = getSimilarity(searcher);
- if (searcher instanceof IndexSearcher) {
- hash = new HashSet<Integer>();
- IndexReader ir = ((IndexSearcher)searcher).getIndexReader();
- final int dfSum[] = new int[1];
- new ReaderUtil.Gather(ir) {
- @Override
- protected void add(int base, IndexReader r) throws IOException {
- int df = r.docFreq(term);
- dfSum[0] += df;
- if (df > 0) {
- hash.add(r.hashCode());
- }
- }
- }.run();
-
- idfExp = similarity.idfExplain(term, searcher, dfSum[0]);
- } else {
- idfExp = similarity.idfExplain(term, searcher);
- hash = null;
- }
-
- idf = idfExp.getIdf();
- }
-
- @Override
- public String toString() { return "weight(" + TermQuery.this + ")"; }
-
- @Override
- public Query getQuery() { return TermQuery.this; }
-
- @Override
- public float getValue() { return value; }
-
- @Override
- public float sumOfSquaredWeights() {
- queryWeight = idf * getBoost(); // compute query weight
- return queryWeight * queryWeight; // square it
- }
-
- @Override
- public void normalize(float queryNorm) {
- this.queryNorm = queryNorm;
- queryWeight *= queryNorm; // normalize query weight
- value = queryWeight * idf; // idf for document
- }
-
- @Override
- public Scorer scorer(IndexReader reader, boolean scoreDocsInOrder, boolean topScorer) throws IOException {
- if (hash != null && !hash.contains(reader.hashCode())) {
- return null;
- }
-
- TermDocs termDocs = reader.termDocs(term);
-
- if (termDocs == null)
- return null;
-
- return new TermScorer(this, termDocs, similarity, reader.norms(term.field()));
- }
-
- @Override
- public Explanation explain(IndexReader reader, int doc)
- throws IOException {
-
- ComplexExplanation result = new ComplexExplanation();
- result.setDescription("weight("+getQuery()+" in "+doc+"), product of:");
-
- Explanation expl = new Explanation(idf, idfExp.explain());
-
- // explain query weight
- Explanation queryExpl = new Explanation();
- queryExpl.setDescription("queryWeight(" + getQuery() + "), product of:");
-
- Explanation boostExpl = new Explanation(getBoost(), "boost");
- if (getBoost() != 1.0f)
- queryExpl.addDetail(boostExpl);
- queryExpl.addDetail(expl);
-
- Explanation queryNormExpl = new Explanation(queryNorm,"queryNorm");
- queryExpl.addDetail(queryNormExpl);
-
- queryExpl.setValue(boostExpl.getValue() *
- expl.getValue() *
- queryNormExpl.getValue());
-
- result.addDetail(queryExpl);
-
- // explain field weight
- String field = term.field();
- ComplexExplanation fieldExpl = new ComplexExplanation();
- fieldExpl.setDescription("fieldWeight("+term+" in "+doc+
- "), product of:");
-
- Explanation tfExplanation = new Explanation();
- int tf = 0;
- TermDocs termDocs = reader.termDocs(term);
- if (termDocs != null) {
- try {
- if (termDocs.skipTo(doc) && termDocs.doc() == doc) {
- tf = termDocs.freq();
- }
- } finally {
- termDocs.close();
- }
- tfExplanation.setValue(similarity.tf(tf));
- tfExplanation.setDescription("tf(termFreq("+term+")="+tf+")");
- } else {
- tfExplanation.setValue(0.0f);
- tfExplanation.setDescription("no matching term");
- }
- fieldExpl.addDetail(tfExplanation);
- fieldExpl.addDetail(expl);
-
- Explanation fieldNormExpl = new Explanation();
- byte[] fieldNorms = reader.norms(field);
- float fieldNorm =
- fieldNorms!=null ? similarity.decodeNormValue(fieldNorms[doc]) : 1.0f;
- fieldNormExpl.setValue(fieldNorm);
- fieldNormExpl.setDescription("fieldNorm(field="+field+", doc="+doc+")");
- fieldExpl.addDetail(fieldNormExpl);
-
- fieldExpl.setMatch(Boolean.valueOf(tfExplanation.isMatch()));
- fieldExpl.setValue(tfExplanation.getValue() *
- expl.getValue() *
- fieldNormExpl.getValue());
-
- result.addDetail(fieldExpl);
- result.setMatch(fieldExpl.getMatch());
-
- // combine them
- result.setValue(queryExpl.getValue() * fieldExpl.getValue());
-
- if (queryExpl.getValue() == 1.0f)
- return fieldExpl;
-
- return result;
- }
- }
-
- /** Constructs a query for the term <code>t</code>. */
- public TermQuery(Term t) {
- term = t;
- }
-
- /** Returns the term of this query. */
- public Term getTerm() { return term; }
-
- @Override
- public Weight createWeight(Searcher searcher) throws IOException {
- return new TermWeight(searcher);
- }
-
- @Override
- public void extractTerms(Set<Term> terms) {
- terms.add(getTerm());
- }
-
- /** Prints a user-readable version of this query. */
- @Override
- public String toString(String field) {
- StringBuilder buffer = new StringBuilder();
- if (!term.field().equals(field)) {
- buffer.append(term.field());
- buffer.append(":");
- }
- buffer.append(term.text());
- buffer.append(ToStringUtils.boost(getBoost()));
- return buffer.toString();
- }
-
- /** Returns true iff <code>o</code> is equal to this. */
- @Override
- public boolean equals(Object o) {
- if (!(o instanceof TermQuery))
- return false;
- TermQuery other = (TermQuery)o;
- return (this.getBoost() == other.getBoost())
- && this.term.equals(other.term);
- }
-
- /** Returns a hash code value for this object.*/
- @Override
- public int hashCode() {
- return Float.floatToIntBits(getBoost()) ^ term.hashCode();
- }
-
-}
fnp / pylucene.git / blobdiff