org.apache.solr.search.function.ValueSourceScorer.java Source code

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Here is the source code for org.apache.solr.search.function.ValueSourceScorer.java

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/**
 * 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.solr.search.function;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.Explanation;
import org.apache.lucene.search.Scorer;

import java.io.IOException;

/** @lucene.internal */
public class ValueSourceScorer extends Scorer {
    protected IndexReader reader;
    private int doc = -1;
    protected final int maxDoc;
    protected final DocValues values;
    protected boolean checkDeletes;

    protected ValueSourceScorer(IndexReader reader, DocValues values) {
        super(null, null);
        this.reader = reader;
        this.maxDoc = reader.maxDoc();
        this.values = values;
        setCheckDeletes(true);
    }

    public IndexReader getReader() {
        return reader;
    }

    public void setCheckDeletes(boolean checkDeletes) {
        this.checkDeletes = checkDeletes && reader.hasDeletions();
    }

    public boolean matches(int doc) {
        return (!checkDeletes || !reader.isDeleted(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();
    }

    public int doc() {
        return doc;
    }

    public boolean next() {
        for (;;) {
            doc++;
            if (doc >= maxDoc)
                return false;
            if (matches(doc))
                return true;
        }
    }

    public boolean skipTo(int target) {
        doc = target - 1;
        return next();
    }

    @Override
    public float score() throws IOException {
        return values.floatVal(doc);
    }

    public Explanation explain(int doc) throws IOException {
        return values.explain(doc);
    }
}