/*
* Licensed 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 com.facebook.presto.orc.reader;
import com.facebook.presto.orc.OrcCorruptionException;
import com.facebook.presto.orc.StreamDescriptor;
import com.facebook.presto.orc.metadata.ColumnEncoding;
import com.facebook.presto.orc.stream.BooleanInputStream;
import com.facebook.presto.orc.stream.InputStreamSource;
import com.facebook.presto.orc.stream.InputStreamSources;
import com.facebook.presto.orc.stream.LongInputStream;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.type.Type;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.DATA;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.DICTIONARY_DATA;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.IN_DICTIONARY;
import static com.facebook.presto.orc.metadata.Stream.StreamKind.PRESENT;
import static com.facebook.presto.orc.stream.MissingInputStreamSource.missingStreamSource;
import static com.google.common.base.MoreObjects.toStringHelper;
import static java.util.Objects.requireNonNull;
public class LongDictionaryStreamReader
implements StreamReader
{
private final StreamDescriptor streamDescriptor;
private int readOffset;
private int nextBatchSize;
@Nonnull
private InputStreamSource<BooleanInputStream> presentStreamSource = missingStreamSource(BooleanInputStream.class);
@Nullable
private BooleanInputStream presentStream;
private boolean[] nullVector = new boolean[0];
@Nonnull
private InputStreamSource<LongInputStream> dictionaryDataStreamSource = missingStreamSource(LongInputStream.class);
private int dictionarySize;
@Nonnull
private long[] dictionary = new long[0];
@Nonnull
private InputStreamSource<BooleanInputStream> inDictionaryStreamSource = missingStreamSource(BooleanInputStream.class);
@Nullable
private BooleanInputStream inDictionaryStream;
private boolean[] inDictionary = new boolean[0];
@Nonnull
private InputStreamSource<LongInputStream> dataStreamSource;
@Nullable
private LongInputStream dataStream;
private long[] dataVector = new long[0];
private boolean dictionaryOpen;
private boolean rowGroupOpen;
public LongDictionaryStreamReader(StreamDescriptor streamDescriptor)
{
this.streamDescriptor = requireNonNull(streamDescriptor, "stream is null");
}
@Override
public void prepareNextRead(int batchSize)
{
readOffset += nextBatchSize;
nextBatchSize = batchSize;
}
@Override
public Block readBlock(Type type)
throws IOException
{
if (!rowGroupOpen) {
openRowGroup();
}
if (readOffset > 0) {
if (presentStream != null) {
// skip ahead the present bit reader, but count the set bits
// and use this as the skip size for the length reader
readOffset = presentStream.countBitsSet(readOffset);
}
if (inDictionaryStream != null) {
inDictionaryStream.skip(readOffset);
}
if (readOffset > 0) {
if (dataStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but data stream is not present");
}
dataStream.skip(readOffset);
}
}
if (nullVector.length < nextBatchSize) {
nullVector = new boolean[nextBatchSize];
}
if (dataVector.length < nextBatchSize) {
dataVector = new long[nextBatchSize];
}
if (presentStream == null) {
if (dataStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but data stream is not present");
}
Arrays.fill(nullVector, false);
dataStream.nextLongVector(nextBatchSize, dataVector);
}
else {
int nullValues = presentStream.getUnsetBits(nextBatchSize, nullVector);
if (nullValues != nextBatchSize) {
if (dataStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Value is not null but data stream is not present");
}
dataStream.nextLongVector(nextBatchSize, dataVector, nullVector);
}
}
if (inDictionary.length < nextBatchSize) {
inDictionary = new boolean[nextBatchSize];
}
if (inDictionaryStream == null) {
Arrays.fill(inDictionary, true);
}
else {
inDictionaryStream.getSetBits(nextBatchSize, inDictionary, nullVector);
}
BlockBuilder builder = type.createBlockBuilder(new BlockBuilderStatus(), nextBatchSize);
for (int i = 0; i < nextBatchSize; i++) {
if (nullVector[i]) {
builder.appendNull();
}
else if (inDictionary[i]) {
type.writeLong(builder, dictionary[((int) dataVector[i])]);
}
else {
type.writeLong(builder, dataVector[i]);
}
}
readOffset = 0;
nextBatchSize = 0;
return builder.build();
}
private void openRowGroup()
throws IOException
{
// read the dictionary
if (!dictionaryOpen && dictionarySize > 0) {
if (dictionary.length < dictionarySize) {
dictionary = new long[dictionarySize];
}
LongInputStream dictionaryStream = dictionaryDataStreamSource.openStream();
if (dictionaryStream == null) {
throw new OrcCorruptionException(streamDescriptor.getOrcDataSourceId(), "Dictionary is not empty but data stream is not present");
}
dictionaryStream.nextLongVector(dictionarySize, dictionary);
}
dictionaryOpen = true;
presentStream = presentStreamSource.openStream();
inDictionaryStream = inDictionaryStreamSource.openStream();
dataStream = dataStreamSource.openStream();
rowGroupOpen = true;
}
@Override
public void startStripe(InputStreamSources dictionaryStreamSources, List<ColumnEncoding> encoding)
throws IOException
{
dictionaryDataStreamSource = dictionaryStreamSources.getInputStreamSource(streamDescriptor, DICTIONARY_DATA, LongInputStream.class);
dictionarySize = encoding.get(streamDescriptor.getStreamId()).getDictionarySize();
dictionaryOpen = false;
inDictionaryStreamSource = missingStreamSource(BooleanInputStream.class);
presentStreamSource = missingStreamSource(BooleanInputStream.class);
dataStreamSource = missingStreamSource(LongInputStream.class);
readOffset = 0;
nextBatchSize = 0;
presentStream = null;
inDictionaryStream = null;
dataStream = null;
rowGroupOpen = false;
}
@Override
public void startRowGroup(InputStreamSources dataStreamSources)
throws IOException
{
presentStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, PRESENT, BooleanInputStream.class);
inDictionaryStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, IN_DICTIONARY, BooleanInputStream.class);
dataStreamSource = dataStreamSources.getInputStreamSource(streamDescriptor, DATA, LongInputStream.class);
readOffset = 0;
nextBatchSize = 0;
presentStream = null;
inDictionaryStream = null;
dataStream = null;
rowGroupOpen = false;
}
@Override
public String toString()
{
return toStringHelper(this)
.addValue(streamDescriptor)
.toString();
}
}