// 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.OrcStruct;
import com.facebook.hive.orc.StreamName;
import com.facebook.hive.orc.OrcProto.RowIndex;
public class LazyStructTreeReader extends LazyTreeReader {
private final LazyTreeReader[] fields;
private final List<String> fieldNames;
public LazyStructTreeReader(int columnId, long rowIndexStride, LazyTreeReader[] fields,
List<String> fieldNames) throws IOException {
super(columnId, rowIndexStride);
this.fields = fields;
this.fieldNames = fieldNames;
}
@Override
public void skipRows(long numNonNullValues) throws IOException {
for(LazyTreeReader field: fields) {
if (field != null) {
field.skipRowsInComplexType(numNonNullValues);
}
}
}
@Override
public Object next(Object previous) throws IOException {
OrcStruct result = null;
if (valuePresent) {
if (previous == null) {
result = new OrcStruct(fieldNames);
} else {
result = (OrcStruct) previous;
// If the input format was initialized with a file with a
// different number of fields, the number of fields needs to
// be updated to the correct number
result.setFieldNames(fieldNames);
}
for(int i=0; i < fields.length; ++i) {
if (fields[i] != null) {
result.setFieldValue(i,
fields[i].getInComplexType(result.getFieldValue(i), previousRow));
}
}
}
return result;
}
@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++) {
if (fields[i] != null) {
fields[i].startStripe(streams, encodings, indexes, rowBaseInStripe);
}
}
if (indexes[columnId] != null) {
loadIndeces(indexes[columnId].getEntryList(), 0);
}
}
@Override
protected void seek(int rowIndexEntry, boolean backwards) throws IOException {
super.seek(rowIndexEntry, backwards);
for (LazyTreeReader field : fields) {
if (field != null) {
field.seek(rowIndexEntry, backwards);
}
}
}
@Override
protected void seek(int index) throws IOException {
// Most tree readers have streams besides the present stream, e.g. the data for a simple type
// or the length of a complex type. The only data structs contain besides whether or not
// they're null is the fields themselves, each of which has its own tree reader, so nothing
// to do here.
}
@Override
public void close() throws IOException {
super.close();
for (LazyTreeReader field : fields) {
if (field != null) {
field.close();
}
}
}
}