| /* |
| * 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.iceberg.orc; |
| |
| import java.io.IOException; |
| import org.apache.iceberg.exceptions.RuntimeIOException; |
| import org.apache.iceberg.io.CloseableIterator; |
| import org.apache.iceberg.util.Pair; |
| import org.apache.orc.RecordReader; |
| import org.apache.orc.TypeDescription; |
| import org.apache.orc.storage.ql.exec.vector.VectorizedRowBatch; |
| |
| /** |
| * An adaptor so that the ORC RecordReader can be used as an Iterator. |
| * Because the same VectorizedRowBatch is reused on each call to next, |
| * it gets changed when hasNext or next is called. |
| */ |
| public class VectorizedRowBatchIterator implements CloseableIterator<Pair<VectorizedRowBatch, Long>> { |
| private final String fileLocation; |
| private final RecordReader rows; |
| private final VectorizedRowBatch batch; |
| private boolean advanced = false; |
| private long batchOffsetInFile = 0; |
| |
| VectorizedRowBatchIterator(String fileLocation, TypeDescription schema, RecordReader rows, int recordsPerBatch) { |
| this.fileLocation = fileLocation; |
| this.rows = rows; |
| this.batch = schema.createRowBatch(recordsPerBatch); |
| } |
| |
| @Override |
| public void close() throws IOException { |
| rows.close(); |
| } |
| |
| private void advance() { |
| if (!advanced) { |
| try { |
| batchOffsetInFile = rows.getRowNumber(); |
| rows.nextBatch(batch); |
| } catch (IOException ioe) { |
| throw new RuntimeIOException(ioe, "Problem reading ORC file %s", fileLocation); |
| } |
| advanced = true; |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| advance(); |
| return batch.size > 0; |
| } |
| |
| @Override |
| public Pair<VectorizedRowBatch, Long> next() { |
| // make sure we have the next batch |
| advance(); |
| // mark it as used |
| advanced = false; |
| return Pair.of(batch, batchOffsetInFile); |
| } |
| } |