package org.apache.lucene.index;
/**
* 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.util.ArrayUtil;
import org.apache.lucene.search.Similarity;
/** Taps into DocInverter, as an InvertedDocEndConsumer,
* which is called at the end of inverting each field. We
* just look at the length for the field (docState.length)
* and record the norm. */
final class NormsWriterPerField extends InvertedDocEndConsumerPerField implements Comparable<NormsWriterPerField> {
final NormsWriterPerThread perThread;
final FieldInfo fieldInfo;
final DocumentsWriter.DocState docState;
// Holds all docID/norm pairs we've seen
int[] docIDs = new int[1];
byte[] norms = new byte[1];
int upto;
final FieldInvertState fieldState;
public void reset() {
// Shrink back if we are overallocated now:
docIDs = ArrayUtil.shrink(docIDs, upto);
norms = ArrayUtil.shrink(norms, upto);
upto = 0;
}
public NormsWriterPerField(final DocInverterPerField docInverterPerField, final NormsWriterPerThread perThread, final FieldInfo fieldInfo) {
this.perThread = perThread;
this.fieldInfo = fieldInfo;
docState = perThread.docState;
fieldState = docInverterPerField.fieldState;
}
@Override
void abort() {
upto = 0;
}
public int compareTo(NormsWriterPerField other) {
return fieldInfo.name.compareTo(other.fieldInfo.name);
}
@Override
void finish() {
assert docIDs.length == norms.length;
if (fieldInfo.isIndexed && !fieldInfo.omitNorms) {
if (docIDs.length <= upto) {
assert docIDs.length == upto;
docIDs = ArrayUtil.grow(docIDs, 1+upto);
norms = ArrayUtil.grow(norms, 1+upto);
}
final float norm = docState.similarity.computeNorm(fieldInfo.name, fieldState);
norms[upto] = Similarity.encodeNorm(norm);
docIDs[upto] = docState.docID;
upto++;
}
}
}