| /* |
| * 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.pig.test.utils; |
| |
| import java.io.File; |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.FileInputStream; |
| import java.io.InputStreamReader; |
| import java.lang.Boolean; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| import org.apache.pig.FilterFunc; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.backend.hadoop.datastorage.ConfigurationUtil; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigInputFormat; |
| import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigMapReduce; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.PigContext; |
| import org.apache.pig.impl.io.FileLocalizer; |
| |
| /** |
| * |
| * define MyFilterSet util.FILTERFROMFILE('/user/pig/filterfile'); |
| * |
| * A = load 'mydata' using PigStorage() as ( a, b ); |
| * B = filter A by MyFilterSet(a); |
| * |
| */ |
| public class FILTERFROMFILE extends FilterFunc{ |
| private String FilterFileName = ""; |
| |
| public FILTERFROMFILE(){ |
| } |
| |
| public FILTERFROMFILE(String FilterFileName){ |
| this.FilterFileName = FilterFileName; |
| } |
| |
| Map<String, Boolean> lookupTable = null; |
| |
| |
| private void init() throws IOException { |
| |
| lookupTable = new HashMap<String, Boolean>(); |
| |
| Properties props = ConfigurationUtil.toProperties(PigMapReduce.sJobConfInternal.get()); |
| InputStream is = FileLocalizer.openDFSFile(FilterFileName, props); |
| |
| BufferedReader reader = new BufferedReader(new InputStreamReader(is)); |
| |
| while (true){ |
| String line = reader.readLine(); |
| |
| if (line == null) |
| break; |
| |
| String FilterField = line.split("\t")[0]; |
| |
| lookupTable.put(FilterField, Boolean.TRUE); |
| } |
| } |
| |
| @Override |
| public Boolean exec(Tuple input) throws IOException { |
| if (lookupTable == null){ |
| init(); |
| } |
| String s; |
| try { |
| s = input.get(0).toString(); |
| } catch (ExecException e) { |
| IOException ioe = new IOException("Error getting data"); |
| ioe.initCause(e); |
| throw ioe; |
| } |
| |
| boolean matched = lookupTable.containsKey(s); |
| |
| return(matched); |
| } |
| } |