package org.apache.solr.search.function;
/*
* 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 org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiFields;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.util.Bits;
import java.io.IOException;
/**
* {@link Scorer} which returns the result of {@link FuncValues#floatVal(int)} as
* the score for a document.
*/
public class ValueSourceScorer extends Scorer {
protected final AtomicReaderContext readerContext;
private int doc = -1;
protected final int maxDoc;
protected final FuncValues values;
protected boolean checkDeletes;
private final Bits liveDocs;
protected ValueSourceScorer(AtomicReaderContext readerContext, FuncValues values) {
super(null);
this.readerContext = readerContext;
this.maxDoc = readerContext.reader().maxDoc();
this.values = values;
setCheckDeletes(true);
this.liveDocs = MultiFields.getLiveDocs(readerContext.reader());
}
public void setCheckDeletes(boolean checkDeletes) {
this.checkDeletes = checkDeletes && readerContext.reader().hasDeletions();
}
public boolean matches(int doc) {
return (!checkDeletes || liveDocs.get(doc)) && matchesValue(doc);
}
public boolean matchesValue(int doc) {
return true;
}
@Override
public int docID() {
return doc;
}
@Override
public int nextDoc() throws IOException {
for (; ; ) {
doc++;
if (doc >= maxDoc) return doc = NO_MORE_DOCS;
if (matches(doc)) return doc;
}
}
@Override
public int advance(int target) throws IOException {
// also works fine when target==NO_MORE_DOCS
doc = target - 1;
return nextDoc();
}
@Override
public float score() throws IOException {
return values.floatVal(doc);
}
@Override
public int freq() throws IOException {
return 1;
}
@Override
public long cost() {
return maxDoc;
}
}