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 java.io.IOException;
import java.util.List;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.DocIdSetIterator;
import org.apache.lucene.search.Filter;
import org.apache.lucene.search.TermRangeFilter;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.Bits;
import org.apache.lucene.util.FixedBitSet;
import org.apache.lucene.util.IOUtils;
import org.apache.lucene.util.Version;
/**
* Split an index based on a {@link Filter}.
*/
public class PKIndexSplitter {
private final Filter docsInFirstIndex;
private final Directory input;
private final Directory dir1;
private final Directory dir2;
private final IndexWriterConfig config1;
private final IndexWriterConfig config2;
/**
* Split an index based on a {@link Filter}. All documents that match the filter
* are sent to dir1, remaining ones to dir2.
*/
public PKIndexSplitter(Version version, Directory input, Directory dir1, Directory dir2, Filter docsInFirstIndex) {
this(input, dir1, dir2, docsInFirstIndex, newDefaultConfig(version), newDefaultConfig(version));
}
private static IndexWriterConfig newDefaultConfig(Version version) {
return new IndexWriterConfig(version, null).setOpenMode(OpenMode.CREATE);
}
public PKIndexSplitter(Directory input, Directory dir1,
Directory dir2, Filter docsInFirstIndex, IndexWriterConfig config1, IndexWriterConfig config2) {
this.input = input;
this.dir1 = dir1;
this.dir2 = dir2;
this.docsInFirstIndex = docsInFirstIndex;
this.config1 = config1;
this.config2 = config2;
}
/**
* Split an index based on a given primary key term
* and a 'middle' term. If the middle term is present, it's
* sent to dir2.
*/
public PKIndexSplitter(Version version, Directory input, Directory dir1, Directory dir2, Term midTerm) {
this(version, input, dir1, dir2,
new TermRangeFilter(midTerm.field(), null, midTerm.bytes(), true, false));
}
public PKIndexSplitter(Directory input, Directory dir1,
Directory dir2, Term midTerm, IndexWriterConfig config1, IndexWriterConfig config2) {
this(input, dir1, dir2,
new TermRangeFilter(midTerm.field(), null, midTerm.bytes(), true, false), config1, config2);
}
public void split() throws IOException {
boolean success = false;
DirectoryReader reader = DirectoryReader.open(input);
try {
// pass an individual config in here since one config can not be reused!
createIndex(config1, dir1, reader, docsInFirstIndex, false);
createIndex(config2, dir2, reader, docsInFirstIndex, true);
success = true;
} finally {
if (success) {
IOUtils.close(reader);
} else {
IOUtils.closeWhileHandlingException(reader);
}
}
}
private void createIndex(IndexWriterConfig config, Directory target, IndexReader reader, Filter preserveFilter, boolean negateFilter) throws IOException {
boolean success = false;
final IndexWriter w = new IndexWriter(target, config);
try {
final List<AtomicReaderContext> leaves = reader.leaves();
final IndexReader[] subReaders = new IndexReader[leaves.size()];
int i = 0;
for (final AtomicReaderContext ctx : leaves) {
subReaders[i++] = new DocumentFilteredAtomicIndexReader(ctx, preserveFilter, negateFilter);
}
w.addIndexes(subReaders);
success = true;
} finally {
if (success) {
IOUtils.close(w);
} else {
IOUtils.closeWhileHandlingException(w);
}
}
}
private static class DocumentFilteredAtomicIndexReader extends FilterAtomicReader {
final Bits liveDocs;
final int numDocs;
public DocumentFilteredAtomicIndexReader(AtomicReaderContext context, Filter preserveFilter, boolean negateFilter) throws IOException {
super(context.reader());
final int maxDoc = in.maxDoc();
final FixedBitSet bits = new FixedBitSet(maxDoc);
// ignore livedocs here, as we filter them later:
final DocIdSet docs = preserveFilter.getDocIdSet(context, null);
if (docs != null) {
final DocIdSetIterator it = docs.iterator();
if (it != null) {
bits.or(it);
}
}
if (negateFilter) {
bits.flip(0, maxDoc);
}
if (in.hasDeletions()) {
final Bits oldLiveDocs = in.getLiveDocs();
assert oldLiveDocs != null;
final DocIdSetIterator it = bits.iterator();
for (int i = it.nextDoc(); i < maxDoc; i = it.nextDoc()) {
if (!oldLiveDocs.get(i)) {
// we can safely modify the current bit, as the iterator already stepped over it:
bits.clear(i);
}
}
}
this.liveDocs = bits;
this.numDocs = bits.cardinality();
}
@Override
public int numDocs() {
return numDocs;
}
@Override
public Bits getLiveDocs() {
return liveDocs;
}
}
}