| /* |
| * 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.samoa.tasks; |
| |
| import com.github.javacliparser.*; |
| import org.apache.samoa.moa.options.AbstractOptionHandler; |
| import org.apache.samoa.streams.InstanceStream; |
| import org.apache.samoa.streams.clustering.RandomRBFGeneratorEvents; |
| import org.apache.samoa.streams.PrequentialSourceProcessor; |
| import org.apache.samoa.topology.ComponentFactory; |
| import org.apache.samoa.topology.Stream; |
| import org.apache.samoa.topology.Topology; |
| import org.apache.samoa.topology.TopologyBuilder; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.BufferedWriter; |
| import java.io.File; |
| import java.io.FileWriter; |
| import java.io.Writer; |
| |
| /** |
| * A task that runs and evaluates a distributed clustering algorithm. |
| */ |
| public class WriteArffFile implements Task, Configurable { |
| |
| |
| private static final long serialVersionUID = -8246537378371580524L; |
| |
| private static final Logger logger = LoggerFactory.getLogger(WriteArffFile.class); |
| |
| public ClassOption streamOption = new ClassOption("stream", 's', "Input stream.", InstanceStream.class, |
| RandomRBFGeneratorEvents.class.getName()); |
| |
| public FileOption arffFileOption = new FileOption("arffFile", 'f', |
| "Destination ARFF file.", null, "arff", true); |
| |
| public IntOption maxInstancesOption = new IntOption("maxInstances", 'm', |
| "Maximum number of instances to write to file.", 10000000, 0, |
| Integer.MAX_VALUE); |
| |
| public FlagOption suppressHeaderOption = new FlagOption("suppressHeader", |
| 'h', "Suppress header from output."); |
| |
| |
| public void getDescription(StringBuilder sb) { |
| sb.append("Writing a stream to an ARFF File"); |
| } |
| |
| @Override |
| public void init() { |
| |
| if (builder == null) { |
| logger.warn("Builder was not initialized, initializing it from the Task"); |
| |
| builder = new TopologyBuilder(); |
| logger.debug("Successfully instantiating TopologyBuilder"); |
| |
| builder.initTopology(arffFileOption.getValue()); |
| logger.debug("Successfully initializing SAMOA topology with name {}", arffFileOption.getValue()); |
| } |
| |
| InstanceStream stream = this.streamOption.getValue(); |
| initStream(stream); |
| |
| preqSource = new PrequentialSourceProcessor(); |
| preqSource.setStreamSource(stream); |
| preqSource.setMaxNumInstances(this.maxInstancesOption.getValue()); |
| builder.addEntranceProcessor(preqSource); |
| |
| Stream sourcePiOutputStream = builder.createStream(preqSource); |
| |
| File destFile = this.arffFileOption.getFile(); |
| if (destFile != null) { |
| try { |
| Writer w = new BufferedWriter(new FileWriter(destFile)); |
| if (!this.suppressHeaderOption.isSet()) { |
| w.write(stream.getHeader().toStringArff()); |
| w.write("\n"); |
| } |
| int numWritten = 0; |
| while ((numWritten < this.maxInstancesOption.getValue()) |
| && stream.hasMoreInstances()) { |
| w.write(stream.nextInstance().getData().toString()); |
| w.write("\n"); |
| numWritten++; |
| } |
| w.close(); |
| } catch (Exception ex) { |
| throw new RuntimeException( |
| "Failed writing to file " + destFile, ex); |
| } |
| this.topology = builder.build(); |
| return; |
| } |
| throw new IllegalArgumentException("No destination file to write to."); |
| } |
| |
| private Topology topology; |
| |
| private TopologyBuilder builder; |
| |
| private PrequentialSourceProcessor preqSource; |
| |
| @Override |
| public void setFactory(ComponentFactory factory) { |
| // TODO unify this code with init() for now, it's used by S4 App |
| // dynamic binding theoretically will solve this problem |
| builder = new TopologyBuilder(factory); |
| logger.debug("Successfully instantiated TopologyBuilder"); |
| |
| builder.initTopology(arffFileOption.getValue()); |
| logger.debug("Successfully initialized SAMOA topology with name {}", arffFileOption.getValue()); |
| |
| } |
| |
| public Topology getTopology() { |
| return topology; |
| } |
| |
| private void initStream(InstanceStream stream) { |
| if (stream instanceof AbstractOptionHandler) { |
| ((AbstractOptionHandler) (stream)).prepareForUse(); |
| } |
| |
| } |
| } |