/*
* 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.
*/
package org.apache.jackrabbit.core.query.lucene;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.Similarity;
import org.apache.lucene.search.Weight;
import java.io.IOException;
/**
* This class implements the Weight calculation for the MatchAllQuery.
*/
class MatchAllWeight implements Weight {
/**
* the MatchAllQuery
*/
private final Query query;
private final String field;
/**
* the current Searcher instance
*/
private final Searcher searcher;
/**
* the weight value
*/
private float value;
/**
* doc frequency for this weight
*/
private float idf;
/**
* the query weight
*/
private float queryWeight;
/**
* @param query
* @param searcher
*/
MatchAllWeight(Query query, Searcher searcher, String field) {
this.query = query;
this.searcher = searcher;
this.field = field;
}
/**
* {@inheritDoc}
*/
public Query getQuery() {
return query;
}
/**
* {@inheritDoc}
*/
public float getValue() {
return value;
}
/**
* {@inheritDoc}
*/
public float sumOfSquaredWeights() throws IOException {
idf = searcher.getSimilarity().idf(searcher.maxDoc(), searcher.maxDoc()); // compute idf
queryWeight = idf * 1.0f; // boost // compute query weight
return queryWeight * queryWeight; // square it
}
/**
* {@inheritDoc}
*/
public void normalize(float queryNorm) {
queryWeight *= queryNorm; // normalize query weight
value = queryWeight * idf; // idf for document
}
/**
* {@inheritDoc}
*/
public Scorer scorer(IndexReader reader) throws IOException {
return new MatchAllScorer(reader, field);
}
/**
* {@inheritDoc}
*/
public Explanation explain(IndexReader reader, int doc) throws IOException {
return new Explanation(Similarity.getDefault().idf(reader.maxDoc(), reader.maxDoc()),
"matchAll");
}
}