// Copyright (c) 2013, Facebook, Inc. All rights reserved.
/**
* 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 com.facebook.hive.orc.lazy;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import com.facebook.hive.orc.InStream;
import com.facebook.hive.orc.OrcProto;
import com.facebook.hive.orc.OrcUnion;
import com.facebook.hive.orc.RunLengthByteReader;
import com.facebook.hive.orc.StreamName;
import com.facebook.hive.orc.OrcProto.RowIndex;
import com.facebook.hive.orc.OrcProto.RowIndexEntry;
public class LazyUnionTreeReader extends LazyTreeReader {
private final LazyTreeReader[] fields;
private RunLengthByteReader tags;
public LazyUnionTreeReader(int columnId, long rowIndexStride, LazyTreeReader[] fields) {
super(columnId, rowIndexStride);
this.fields = fields;
}
@Override
public Object next(Object previous) throws IOException {
OrcUnion result = null;
if (valuePresent) {
if (previous == null) {
result = new OrcUnion();
} else {
result = (OrcUnion) previous;
}
byte tag = nextTag();
Object previousVal = result.getObject();
result.set(tag, fields[tag].getInComplexType(tag == result.getTag() ?
previousVal : null, previousRow));
}
return result;
}
@Override
protected void seek(int rowIndexEntry, boolean backwards) throws IOException {
super.seek(rowIndexEntry, backwards);
for (LazyTreeReader field : fields) {
field.seek(rowIndexEntry, backwards);
}
}
@Override
public void startStripe(Map<StreamName, InStream> streams, List<OrcProto.ColumnEncoding> encodings,
RowIndex[] indexes, long rowBaseInStripe) throws IOException {
super.startStripe(streams, encodings, indexes, rowBaseInStripe);
for (int i = 0; i < fields.length; i++) {
fields[i].startStripe(streams, encodings, indexes, rowBaseInStripe);
}
tags = new RunLengthByteReader(streams.get(new StreamName(columnId,
OrcProto.Stream.Kind.DATA)));
if (indexes[columnId] != null) {
loadIndeces(indexes[columnId].getEntryList(), 0);
}
}
@Override
public void seek(int index) throws IOException {
tags.seek(index);
}
@Override
public int loadIndeces(List<RowIndexEntry> rowIndexEntries, int startIndex) {
int updatedStartIndex = super.loadIndeces(rowIndexEntries, startIndex);
return tags.loadIndeces(rowIndexEntries, updatedStartIndex);
}
public byte nextTag() throws IOException {
return (byte) tags.next();
}
@Override
public void skipRows(long numNonNullValues) throws IOException {
long[] counts = new long[fields.length];
for(int i=0; i < numNonNullValues; ++i) {
counts[tags.next()] += 1;
}
for(int i=0; i < counts.length; ++i) {
fields[i].skipRowsInComplexType(counts[i]);
}
}
@Override
public void close() throws IOException {
super.close();
for (LazyTreeReader field : fields) {
field.close();
}
if (tags != null) {
tags.close();
}
}
}