| /* |
| * 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 org.apache.orc.impl.reader.tree; |
| |
| import org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch; |
| import org.apache.orc.impl.PositionProvider; |
| import org.apache.orc.impl.reader.StripePlanner; |
| |
| import java.io.IOException; |
| |
| |
| /** |
| * The top level interface that the reader uses to read the columns from the |
| * ORC file. |
| */ |
| public abstract class BatchReader { |
| // The row type reader |
| public final TypeReader rootType; |
| |
| protected int vectorColumnCount = -1; |
| |
| public BatchReader(TypeReader rootType) { |
| this.rootType = rootType; |
| } |
| |
| public void startStripe(StripePlanner planner) throws IOException { |
| rootType.startStripe(planner); |
| } |
| |
| public void setVectorColumnCount(int vectorColumnCount) { |
| this.vectorColumnCount = vectorColumnCount; |
| } |
| |
| /** |
| * Read the next batch of data from the file. |
| * @param batch the batch to read into |
| * @param batchSize the number of rows to read |
| * @throws IOException errors reading the file |
| */ |
| public abstract void nextBatch(VectorizedRowBatch batch, |
| int batchSize) throws IOException; |
| |
| protected void resetBatch(VectorizedRowBatch batch, int batchSize) { |
| batch.selectedInUse = false; |
| batch.size = batchSize; |
| } |
| |
| public void skipRows(long rows) throws IOException { |
| rootType.skipRows(rows); |
| } |
| |
| public void seek(PositionProvider[] index) throws IOException { |
| rootType.seek(index); |
| } |
| } |