/*
    * 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.giraph.examples;
  
  import org.apache.giraph.conf.GiraphConfiguration;
  import org.apache.giraph.io.formats.IdWithValueTextOutputFormat;
  import org.apache.giraph.io.formats.IntIntNullTextInputFormat;
  import org.apache.giraph.utils.InternalVertexRunner;
  import org.junit.Test;
  
  import com.google.common.collect.Maps;
  
  import java.util.Map;
  
  import static org.junit.Assert.assertEquals;
  
  /**
   * Test for max computation
   */
  public class MaxComputationTest {
    @Test
    public void testMax() throws Exception {
      String[] graph = {
          "5 1",
          "1 5 2",
          "2 5",
      };
  
      GiraphConfiguration conf = new GiraphConfiguration();
      conf.setComputationClass(MaxComputation.class);
      conf.setVertexInputFormatClass(IntIntNullTextInputFormat.class);
      conf.setVertexOutputFormatClass(IdWithValueTextOutputFormat.class);
      Iterable<String> results = InternalVertexRunner.run(conf, graph);
  
      Map<Integer, Integer> values = parseResults(results);
      assertEquals(3, values.size());
      assertEquals(5, (int) values.get(1));
      assertEquals(5, (int) values.get(2));
      assertEquals(5, (int) values.get(5));
    }
  
    private static Map<Integer, Integer> parseResults(Iterable<String> results) {
      Map<Integer, Integer> values = Maps.newHashMap();
      for (String line : results) {
        String[] tokens = line.split("\\s+");
        int id = Integer.valueOf(tokens[0]);
        int value = Integer.valueOf(tokens[1]);
        values.put(id, value);
      }
      return values;
    }
  }