| /** |
| * 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.mrql; |
| |
| import java.io.*; |
| import java.net.URI; |
| import java.util.Iterator; |
| import org.apache.hadoop.conf.Configuration; |
| import org.apache.flink.api.java.DataSet; |
| import org.apache.flink.api.common.io.FileInputFormat; |
| import org.apache.flink.core.fs.FSDataInputStream; |
| import org.apache.flink.core.fs.FileSystem; |
| import org.apache.flink.core.fs.Path; |
| import org.apache.flink.core.fs.FileInputSplit; |
| |
| |
| /** A FileInputFormat for text files (CVS, XML, JSON, ...) */ |
| final public class FlinkParsedInputFormat extends FlinkMRQLFileInputFormat { |
| public FlinkParsedInputFormat () {} |
| |
| public static final class ParsedInputFormat extends FileInputFormat<FData> { |
| String pathname; |
| transient FlinkParser parser; |
| transient Iterator<MRData> iter; |
| boolean eof; |
| String data_sources; // the encoded data source directory (to be serialized and distributed to clients) |
| |
| public ParsedInputFormat ( String pathname ) { |
| this.pathname = pathname; |
| data_sources = encode_data_sources(); |
| } |
| |
| @Override |
| public void open ( FileInputSplit split ) throws IOException { |
| super.open(split); |
| restore_data_sources(data_sources); |
| String path = split.getPath().toString(); |
| try { |
| ParsedDataSource ds = (ParsedDataSource)DataSource.get(path,Plan.conf); |
| parser = (FlinkParser)ds.parser.newInstance(); |
| parser.initialize(ds.args); |
| } catch (Exception ex) { |
| throw new Error("Cannot parse the file: "+path); |
| }; |
| parser.open(stream,splitStart,splitStart+splitLength-1); |
| eof = false; |
| } |
| |
| @Override |
| public FData nextRecord ( FData data ) throws IOException { |
| while (!eof && (iter == null || !iter.hasNext())) { |
| String line = parser.slice(); |
| if (line == null) { |
| eof = true; |
| return null; |
| }; |
| iter = parser.parse(line).iterator(); |
| }; |
| return new FData(iter.next()); |
| } |
| |
| @Override |
| public boolean reachedEnd () { |
| return eof; |
| } |
| } |
| |
| /** the Flink input format for this input */ |
| public FileInputFormat<FData> inputFormat ( String path ) { |
| return new ParsedInputFormat(path); |
| } |
| } |