/*
 * 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.learners.clusterers;

import com.google.common.collect.ImmutableSet;

import java.util.Set;

import org.apache.samoa.core.Processor;
import org.apache.samoa.instances.Instances;
import org.apache.samoa.learners.Learner;
import org.apache.samoa.topology.Stream;
import org.apache.samoa.topology.TopologyBuilder;

import com.github.javacliparser.ClassOption;
import com.github.javacliparser.Configurable;

/**
 * 
 * Learner that contain a single learner.
 * 
 */
public final class SingleLearner implements Learner, Configurable {

  private static final long serialVersionUID = 684111382631697031L;

  private LocalClustererProcessor learnerP;

  private Stream resultStream;

  private Instances dataset;

  public ClassOption learnerOption = new ClassOption("learner", 'l',
      "Learner to train.", LocalClustererAdapter.class, ClustreamClustererAdapter.class.getName());

  private TopologyBuilder builder;

  private int parallelism;

  @Override
  public void init(TopologyBuilder builder, Instances dataset, int parallelism) {
    this.builder = builder;
    this.dataset = dataset;
    this.parallelism = parallelism;
    this.setLayout();
  }

  protected void setLayout() {
    learnerP = new LocalClustererProcessor();
    LocalClustererAdapter learner = this.learnerOption.getValue();
    learner.setDataset(this.dataset);
    learnerP.setLearner(learner);

    this.builder.addProcessor(learnerP, this.parallelism);
    resultStream = this.builder.createStream(learnerP);

    learnerP.setOutputStream(resultStream);
  }

  /*
   * (non-Javadoc)
   * 
   * @see samoa.classifiers.Classifier#getInputProcessingItem()
   */
  @Override
  public Processor getInputProcessor() {
    return learnerP;
  }

  /*
   * (non-Javadoc)
   * 
   * @see samoa.learners.Learner#getResultStreams()
   */
  @Override
  public Set<Stream> getResultStreams() {
    return ImmutableSet.of(this.resultStream);
  }
}