package org.apache.lucene.codecs.mockintblock;
/*
* 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 org.apache.lucene.codecs.FieldsConsumer;
import org.apache.lucene.codecs.FieldsProducer;
import org.apache.lucene.codecs.PostingsFormat;
import org.apache.lucene.codecs.PostingsReaderBase;
import org.apache.lucene.codecs.PostingsWriterBase;
import org.apache.lucene.codecs.blockterms.BlockTermsReader;
import org.apache.lucene.codecs.blockterms.BlockTermsWriter;
import org.apache.lucene.codecs.blockterms.FixedGapTermsIndexReader;
import org.apache.lucene.codecs.blockterms.FixedGapTermsIndexWriter;
import org.apache.lucene.codecs.blockterms.TermsIndexReaderBase;
import org.apache.lucene.codecs.blockterms.TermsIndexWriterBase;
import org.apache.lucene.codecs.intblock.VariableIntBlockIndexInput;
import org.apache.lucene.codecs.intblock.VariableIntBlockIndexOutput;
import org.apache.lucene.codecs.sep.IntIndexInput;
import org.apache.lucene.codecs.sep.IntIndexOutput;
import org.apache.lucene.codecs.sep.IntStreamFactory;
import org.apache.lucene.codecs.sep.SepPostingsReader;
import org.apache.lucene.codecs.sep.SepPostingsWriter;
import org.apache.lucene.index.SegmentReadState;
import org.apache.lucene.index.SegmentWriteState;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.IndexInput;
import org.apache.lucene.store.IndexOutput;
import org.apache.lucene.util.BytesRef;
import org.apache.lucene.util.IOUtils;
/**
* A silly test codec to verify core support for variable
* sized int block encoders is working. The int encoder
* used here writes baseBlockSize ints at once, if the first
* int is <= 3, else 2*baseBlockSize.
*/
public final class MockVariableIntBlockPostingsFormat extends PostingsFormat {
private final int baseBlockSize;
public MockVariableIntBlockPostingsFormat() {
this(1);
}
public MockVariableIntBlockPostingsFormat(int baseBlockSize) {
super("MockVariableIntBlock");
this.baseBlockSize = baseBlockSize;
}
@Override
public String toString() {
return getName() + "(baseBlockSize="+ baseBlockSize + ")";
}
/**
* If the first value is <= 3, writes baseBlockSize vInts at once,
* otherwise writes 2*baseBlockSize vInts.
*/
public static class MockIntFactory extends IntStreamFactory {
private final int baseBlockSize;
public MockIntFactory(int baseBlockSize) {
this.baseBlockSize = baseBlockSize;
}
@Override
public IntIndexInput openInput(Directory dir, String fileName, IOContext context) throws IOException {
final IndexInput in = dir.openInput(fileName, context);
final int baseBlockSize = in.readInt();
return new VariableIntBlockIndexInput(in) {
@Override
protected BlockReader getBlockReader(final IndexInput in, final int[] buffer) {
return new BlockReader() {
@Override
public void seek(long pos) {}
@Override
public int readBlock() throws IOException {
buffer[0] = in.readVInt();
final int count = buffer[0] <= 3 ? baseBlockSize-1 : 2*baseBlockSize-1;
assert buffer.length >= count: "buffer.length=" + buffer.length + " count=" + count;
for(int i=0;i<count;i++) {
buffer[i+1] = in.readVInt();
}
return 1+count;
}
};
}
};
}
@Override
public IntIndexOutput createOutput(Directory dir, String fileName, IOContext context) throws IOException {
final IndexOutput out = dir.createOutput(fileName, context);
boolean success = false;
try {
out.writeInt(baseBlockSize);
VariableIntBlockIndexOutput ret = new VariableIntBlockIndexOutput(out, 2*baseBlockSize) {
int pendingCount;
final int[] buffer = new int[2+2*baseBlockSize];
@Override
protected int add(int value) throws IOException {
buffer[pendingCount++] = value;
// silly variable block length int encoder: if
// first value <= 3, we write N vints at once;
// else, 2*N
final int flushAt = buffer[0] <= 3 ? baseBlockSize : 2*baseBlockSize;
// intentionally be non-causal here:
if (pendingCount == flushAt+1) {
for(int i=0;i<flushAt;i++) {
out.writeVInt(buffer[i]);
}
buffer[0] = buffer[flushAt];
pendingCount = 1;
return flushAt;
} else {
return 0;
}
}
};
success = true;
return ret;
} finally {
if (!success) {
IOUtils.closeWhileHandlingException(out);
}
}
}
}
@Override
public FieldsConsumer fieldsConsumer(SegmentWriteState state) throws IOException {
PostingsWriterBase postingsWriter = new SepPostingsWriter(state, new MockIntFactory(baseBlockSize));
boolean success = false;
TermsIndexWriterBase indexWriter;
try {
indexWriter = new FixedGapTermsIndexWriter(state);
success = true;
} finally {
if (!success) {
postingsWriter.close();
}
}
success = false;
try {
FieldsConsumer ret = new BlockTermsWriter(indexWriter, state, postingsWriter);
success = true;
return ret;
} finally {
if (!success) {
try {
postingsWriter.close();
} finally {
indexWriter.close();
}
}
}
}
@Override
public FieldsProducer fieldsProducer(SegmentReadState state) throws IOException {
PostingsReaderBase postingsReader = new SepPostingsReader(state.directory,
state.fieldInfos,
state.segmentInfo,
state.context,
new MockIntFactory(baseBlockSize), state.segmentSuffix);
TermsIndexReaderBase indexReader;
boolean success = false;
try {
indexReader = new FixedGapTermsIndexReader(state.directory,
state.fieldInfos,
state.segmentInfo.name,
BytesRef.getUTF8SortedAsUnicodeComparator(),
state.segmentSuffix, state.context);
success = true;
} finally {
if (!success) {
postingsReader.close();
}
}
success = false;
try {
FieldsProducer ret = new BlockTermsReader(indexReader,
state.directory,
state.fieldInfos,
state.segmentInfo,
postingsReader,
state.context,
state.segmentSuffix);
success = true;
return ret;
} finally {
if (!success) {
try {
postingsReader.close();
} finally {
indexReader.close();
}
}
}
}
}