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package org.apache.lucene.index;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import org.apache.lucene.util.ArrayUtil;
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import org.apache.lucene.search.Similarity;
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/** Taps into DocInverter, as an InvertedDocEndConsumer,
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* which is called at the end of inverting each field. We
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* just look at the length for the field (docState.length)
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* and record the norm. */
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final class NormsWriterPerField extends InvertedDocEndConsumerPerField implements Comparable<NormsWriterPerField> {
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final NormsWriterPerThread perThread;
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final FieldInfo fieldInfo;
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final DocumentsWriter.DocState docState;
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// Holds all docID/norm pairs we've seen
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int[] docIDs = new int[1];
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byte[] norms = new byte[1];
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final FieldInvertState fieldState;
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// Shrink back if we are overallocated now:
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docIDs = ArrayUtil.shrink(docIDs, upto);
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norms = ArrayUtil.shrink(norms, upto);
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public NormsWriterPerField(final DocInverterPerField docInverterPerField, final NormsWriterPerThread perThread, final FieldInfo fieldInfo) {
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this.perThread = perThread;
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this.fieldInfo = fieldInfo;
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docState = perThread.docState;
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fieldState = docInverterPerField.fieldState;
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public int compareTo(NormsWriterPerField other) {
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return fieldInfo.name.compareTo(other.fieldInfo.name);
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if (fieldInfo.isIndexed && !fieldInfo.omitNorms) {
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if (docIDs.length <= upto) {
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assert docIDs.length == upto;
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docIDs = ArrayUtil.grow(docIDs, 1+upto);
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if (norms.length <= upto) {
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assert norms.length == upto;
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norms = ArrayUtil.grow(norms, 1+upto);
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final float norm = docState.similarity.computeNorm(fieldInfo.name, fieldState);
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norms[upto] = docState.similarity.encodeNormValue(norm);
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docIDs[upto] = docState.docID;