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.Iterator;
import java.util.NoSuchElementException;
import org.apache.lucene.codecs.DocValuesConsumer;
import org.apache.lucene.util.Counter;
import org.apache.lucene.util.OpenBitSet;
import org.apache.lucene.util.RamUsageEstimator;
import org.apache.lucene.util.packed.AppendingDeltaPackedLongBuffer;
import org.apache.lucene.util.packed.PackedInts;
/** Buffers up pending long per doc, then flushes when
* segment flushes. */
class NumericDocValuesWriter extends DocValuesWriter {
private final static long MISSING = 0L;
private AppendingDeltaPackedLongBuffer pending;
private final Counter iwBytesUsed;
private long bytesUsed;
private final OpenBitSet docsWithField;
private final FieldInfo fieldInfo;
private final boolean trackDocsWithField;
public NumericDocValuesWriter(FieldInfo fieldInfo, Counter iwBytesUsed, boolean trackDocsWithField) {
pending = new AppendingDeltaPackedLongBuffer(PackedInts.COMPACT);
docsWithField = new OpenBitSet();
bytesUsed = pending.ramBytesUsed() + docsWithFieldBytesUsed();
this.fieldInfo = fieldInfo;
this.iwBytesUsed = iwBytesUsed;
iwBytesUsed.addAndGet(bytesUsed);
this.trackDocsWithField = trackDocsWithField;
}
public void addValue(int docID, long value) {
if (docID < pending.size()) {
throw new IllegalArgumentException("DocValuesField \"" + fieldInfo.name + "\" appears more than once in this document (only one value is allowed per field)");
}
// Fill in any holes:
for (int i = (int)pending.size(); i < docID; ++i) {
pending.add(MISSING);
}
pending.add(value);
if (trackDocsWithField) {
docsWithField.set(docID);
}
updateBytesUsed();
}
private long docsWithFieldBytesUsed() {
// size of the long[] + some overhead
return RamUsageEstimator.sizeOf(docsWithField.getBits()) + 64;
}
private void updateBytesUsed() {
final long newBytesUsed = pending.ramBytesUsed() + docsWithFieldBytesUsed();
iwBytesUsed.addAndGet(newBytesUsed - bytesUsed);
bytesUsed = newBytesUsed;
}
@Override
public void finish(int maxDoc) {
}
@Override
public void flush(SegmentWriteState state, DocValuesConsumer dvConsumer) throws IOException {
final int maxDoc = state.segmentInfo.getDocCount();
dvConsumer.addNumericField(fieldInfo,
new Iterable<Number>() {
@Override
public Iterator<Number> iterator() {
return new NumericIterator(maxDoc);
}
});
}
@Override
public void abort() {
}
// iterates over the values we have in ram
private class NumericIterator implements Iterator<Number> {
final AppendingDeltaPackedLongBuffer.Iterator iter = pending.iterator();
final int size = (int)pending.size();
final int maxDoc;
int upto;
NumericIterator(int maxDoc) {
this.maxDoc = maxDoc;
}
@Override
public boolean hasNext() {
return upto < maxDoc;
}
@Override
public Number next() {
if (!hasNext()) {
throw new NoSuchElementException();
}
Long value;
if (upto < size) {
long v = iter.next();
if (!trackDocsWithField || docsWithField.get(upto)) {
value = v;
} else {
value = null;
}
} else {
value = trackDocsWithField ? null : MISSING;
}
upto++;
return value;
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
}