| /* |
| * 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.lucene.search; |
| |
| |
| import java.io.IOException; |
| |
| import org.apache.lucene.index.LeafReaderContext; |
| import org.apache.lucene.util.Bits; |
| |
| /** |
| * A query that matches all documents. |
| */ |
| public final class MatchAllDocsQuery extends Query { |
| |
| @Override |
| public Weight createWeight(IndexSearcher searcher, ScoreMode scoreMode, float boost) { |
| return new ConstantScoreWeight(this, boost) { |
| @Override |
| public String toString() { |
| return "weight(" + MatchAllDocsQuery.this + ")"; |
| } |
| @Override |
| public Scorer scorer(LeafReaderContext context) throws IOException { |
| return new ConstantScoreScorer(this, score(), scoreMode, DocIdSetIterator.all(context.reader().maxDoc())); |
| } |
| |
| @Override |
| public boolean isCacheable(LeafReaderContext ctx) { |
| return true; |
| } |
| |
| @Override |
| public BulkScorer bulkScorer(LeafReaderContext context) throws IOException { |
| if (scoreMode.isExhaustive() == false) { |
| return super.bulkScorer(context); |
| } |
| final float score = score(); |
| final int maxDoc = context.reader().maxDoc(); |
| return new BulkScorer() { |
| @Override |
| public int score(LeafCollector collector, Bits acceptDocs, int min, int max) throws IOException { |
| max = Math.min(max, maxDoc); |
| ScoreAndDoc scorer = new ScoreAndDoc(); |
| scorer.score = score; |
| collector.setScorer(scorer); |
| for (int doc = min; doc < max; ++doc) { |
| scorer.doc = doc; |
| if (acceptDocs == null || acceptDocs.get(doc)) { |
| collector.collect(doc); |
| } |
| } |
| return max == maxDoc ? DocIdSetIterator.NO_MORE_DOCS : max; |
| } |
| @Override |
| public long cost() { |
| return maxDoc; |
| } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public String toString(String field) { |
| return "*:*"; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| return sameClassAs(o); |
| } |
| |
| @Override |
| public int hashCode() { |
| return classHash(); |
| } |
| |
| @Override |
| public void visit(QueryVisitor visitor) { |
| visitor.visitLeaf(this); |
| } |
| } |