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

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Here is the source code for org.apache.solr.search.function.NormValueSource.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.AtomicReaderContext;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Similarity;
import java.io.IOException;
import java.util.Map;

public class NormValueSource extends ValueSource {
    protected String field;

    public NormValueSource(String field) {
        this.field = field;
    }

    public String name() {
        return "norm";
    }

    @Override
    public String description() {
        return name() + '(' + field + ')';
    }

    @Override
    public void createWeight(Map context, IndexSearcher searcher) throws IOException {
        context.put("searcher", searcher);
    }

    @Override
    public DocValues getValues(Map context, AtomicReaderContext readerContext) throws IOException {
        IndexSearcher searcher = (IndexSearcher) context.get("searcher");
        final Similarity similarity = searcher.getSimilarity();
        final byte[] norms = readerContext.reader.norms(field);
        if (norms == null) {
            return new ConstDoubleDocValues(0.0, this);
        }

        return new FloatDocValues(this) {
            @Override
            public float floatVal(int doc) {
                return similarity.decodeNormValue(norms[doc]);
            }
        };
    }

    @Override
    public boolean equals(Object o) {
        if (this.getClass() != o.getClass())
            return false;
        return this.field.equals(((NormValueSource) o).field);
    }

    @Override
    public int hashCode() {
        return this.getClass().hashCode() + field.hashCode();
    }
}