sql/connector/JavaSimpleReaderFactory.java

0001 /*
0002  * Licensed to the Apache Software Foundation (ASF) under one or more
0003  * contributor license agreements.  See the NOTICE file distributed with
0004  * this work for additional information regarding copyright ownership.
0005  * The ASF licenses this file to You under the Apache License, Version 2.0
0006  * (the "License"); you may not use this file except in compliance with
0007  * the License.  You may obtain a copy of the License at
0008  *
0009  *    http://www.apache.org/licenses/LICENSE-2.0
0010  *
0011  * Unless required by applicable law or agreed to in writing, software
0012  * distributed under the License is distributed on an "AS IS" BASIS,
0013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
0014  * See the License for the specific language governing permissions and
0015  * limitations under the License.
0016  */
0017
0018 package test.org.apache.spark.sql.connector;
0019
0020 import org.apache.spark.sql.catalyst.InternalRow;
0021 import org.apache.spark.sql.catalyst.expressions.GenericInternalRow;
0022 import org.apache.spark.sql.connector.read.InputPartition;
0023 import org.apache.spark.sql.connector.read.PartitionReader;
0024 import org.apache.spark.sql.connector.read.PartitionReaderFactory;
0025
0026 class JavaSimpleReaderFactory implements PartitionReaderFactory {
0027
0028   @Override
0029   public PartitionReader<InternalRow> createReader(InputPartition partition) {
0030     JavaRangeInputPartition p = (JavaRangeInputPartition) partition;
0031     return new PartitionReader<InternalRow>() {
0032       private int current = p.start - 1;
0033
0034       @Override
0035       public boolean next() {
0036         current += 1;
0037         return current < p.end;
0038       }
0039
0040       @Override
0041       public InternalRow get() {
0042         return new GenericInternalRow(new Object[] {current, -current});
0043       }
0044
0045       @Override
0046       public void close() {
0047       }
0048     };
0049   }
0050 }