/** * 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 org.apache.flink.core.fs.FSDataInputStream; /** A parser for line-oriented, character delimited text files (such as CVS) */ final public class FlinkLineParser extends LineParser implements FlinkParser { LineReader in; byte[] line; @Override public void open ( FSDataInputStream fsin, long fstart, long fend ) { in_memory = false; start = fstart; end = fend; try { in = new LineReader(fsin,start,end-start+1,maxLineLength); if (false && start != 0) { // for all but the first data split, skip the first record line = in.readLine(); if (line != null) start += line.length; }; pos = start; } catch ( IOException e ) { System.err.println("*** Cannot parse the data split: "+fsin); start = end; } } @Override public String slice () { try { if (in_memory) return buffered_in.readLine(); while (pos <= end) { line = in.readLine(); if (line == null) return null; pos += line.length; if (line.length < maxLineLength) return new String(line); else return ""; }; return null; } catch ( Exception e ) { System.err.println("*** Cannot slice the text: "+e); return ""; } } }