| /* |
| * 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.lucene.codecs; |
| |
| import java.io.Closeable; |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.lucene.index.DocIDMerger; |
| import org.apache.lucene.index.FieldInfo; |
| import org.apache.lucene.index.MergeState; |
| import org.apache.lucene.index.NumericDocValues; |
| import org.apache.lucene.index.SegmentWriteState; |
| |
| /** |
| * Abstract API that consumes normalization values. |
| * Concrete implementations of this |
| * actually do "something" with the norms (write it into |
| * the index in a specific format). |
| * <p> |
| * The lifecycle is: |
| * <ol> |
| * <li>NormsConsumer is created by |
| * {@link NormsFormat#normsConsumer(SegmentWriteState)}. |
| * <li>{@link #addNormsField} is called for each field with |
| * normalization values. The API is a "pull" rather |
| * than "push", and the implementation is free to iterate over the |
| * values multiple times ({@link Iterable#iterator()}). |
| * <li>After all fields are added, the consumer is {@link #close}d. |
| * </ol> |
| * |
| * @lucene.experimental |
| */ |
| public abstract class NormsConsumer implements Closeable { |
| |
| /** Sole constructor. (For invocation by subclass |
| * constructors, typically implicit.) */ |
| protected NormsConsumer() {} |
| |
| /** |
| * Writes normalization values for a field. |
| * @param field field information |
| * @param normsProducer NormsProducer of the numeric norm values |
| * @throws IOException if an I/O error occurred. |
| */ |
| public abstract void addNormsField(FieldInfo field, NormsProducer normsProducer) throws IOException; |
| |
| /** Merges in the fields from the readers in |
| * <code>mergeState</code>. The default implementation |
| * calls {@link #mergeNormsField} for each field, |
| * filling segments with missing norms for the field with zeros. |
| * Implementations can override this method |
| * for more sophisticated merging (bulk-byte copying, etc). */ |
| public void merge(MergeState mergeState) throws IOException { |
| for(NormsProducer normsProducer : mergeState.normsProducers) { |
| if (normsProducer != null) { |
| normsProducer.checkIntegrity(); |
| } |
| } |
| for (FieldInfo mergeFieldInfo : mergeState.mergeFieldInfos) { |
| if (mergeFieldInfo.hasNorms()) { |
| mergeNormsField(mergeFieldInfo, mergeState); |
| } |
| } |
| } |
| |
| /** Tracks state of one numeric sub-reader that we are merging */ |
| private static class NumericDocValuesSub extends DocIDMerger.Sub { |
| |
| private final NumericDocValues values; |
| |
| public NumericDocValuesSub(MergeState.DocMap docMap, NumericDocValues values) { |
| super(docMap); |
| this.values = values; |
| assert values.docID() == -1; |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| return values.nextDoc(); |
| } |
| } |
| |
| /** |
| * Merges the norms from <code>toMerge</code>. |
| * <p> |
| * The default implementation calls {@link #addNormsField}, passing |
| * an Iterable that merges and filters deleted documents on the fly. |
| */ |
| public void mergeNormsField(final FieldInfo mergeFieldInfo, final MergeState mergeState) throws IOException { |
| |
| // TODO: try to share code with default merge of DVConsumer by passing MatchAllBits ? |
| addNormsField(mergeFieldInfo, |
| new NormsProducer() { |
| @Override |
| public NumericDocValues getNorms(FieldInfo fieldInfo) throws IOException { |
| if (fieldInfo != mergeFieldInfo) { |
| throw new IllegalArgumentException("wrong fieldInfo"); |
| } |
| |
| List<NumericDocValuesSub> subs = new ArrayList<>(); |
| assert mergeState.docMaps.length == mergeState.docValuesProducers.length; |
| for (int i=0;i<mergeState.docValuesProducers.length;i++) { |
| NumericDocValues norms = null; |
| NormsProducer normsProducer = mergeState.normsProducers[i]; |
| if (normsProducer != null) { |
| FieldInfo readerFieldInfo = mergeState.fieldInfos[i].fieldInfo(mergeFieldInfo.name); |
| if (readerFieldInfo != null && readerFieldInfo.hasNorms()) { |
| norms = normsProducer.getNorms(readerFieldInfo); |
| } |
| } |
| |
| if (norms != null) { |
| subs.add(new NumericDocValuesSub(mergeState.docMaps[i], norms)); |
| } |
| } |
| |
| final DocIDMerger<NumericDocValuesSub> docIDMerger = DocIDMerger.of(subs, mergeState.needsIndexSort); |
| |
| return new NumericDocValues() { |
| private int docID = -1; |
| private NumericDocValuesSub current; |
| |
| @Override |
| public int docID() { |
| return docID; |
| } |
| |
| @Override |
| public int nextDoc() throws IOException { |
| current = docIDMerger.next(); |
| if (current == null) { |
| docID = NO_MORE_DOCS; |
| } else { |
| docID = current.mappedDocID; |
| } |
| return docID; |
| } |
| |
| @Override |
| public int advance(int target) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public boolean advanceExact(int target) throws IOException { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long cost() { |
| return 0; |
| } |
| |
| @Override |
| public long longValue() throws IOException { |
| return current.values.longValue(); |
| } |
| }; |
| } |
| |
| @Override |
| public void checkIntegrity() { |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public long ramBytesUsed() { |
| return 0; |
| } |
| }); |
| } |
| } |