library/src/test/java/com/datatorrent/lib/algo/LeastFrequentKeyValueMapTest.java

/*
 * Copyright (c) 2013 DataTorrent, Inc. ALL Rights Reserved.
 *
 * Licensed 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 com.datatorrent.lib.algo;

import java.util.HashMap;
import java.util.Map;

import org.junit.Assert;

import org.junit.Test;

import com.datatorrent.lib.testbench.CollectorTestSink;

/**
 *
 * Functional tests for {@link com.datatorrent.lib.algo.LeastFrequentKeyValueMap}<p>
 *
 */
public class LeastFrequentKeyValueMapTest
{
  /**
   * Test node logic emits correct results
   */
  @SuppressWarnings({ "rawtypes", "unchecked" })
  @Test
  public void testNodeProcessing() throws Exception
  {
    LeastFrequentKeyValueMap<String, Integer> oper = new LeastFrequentKeyValueMap<String, Integer>();
    CollectorTestSink matchSink = new CollectorTestSink();
    oper.least.setSink(matchSink);

    oper.beginWindow(0);
    HashMap<String, Integer> amap = new HashMap<String, Integer>(1);
    HashMap<String, Integer> bmap = new HashMap<String, Integer>(1);
    HashMap<String, Integer> cmap = new HashMap<String, Integer>(1);
    int atot1 = 5;
    int btot1 = 3;
    int ctot1 = 6;
    amap.put("a", 1);
    bmap.put("b", 2);
    cmap.put("c", 4);
    for (int i = 0; i < atot1; i++) {
      oper.data.process(amap);
    }
    for (int i = 0; i < btot1; i++) {
      oper.data.process(bmap);
    }
    for (int i = 0; i < ctot1; i++) {
      oper.data.process(cmap);
    }

    atot1 = 4;
    btot1 = 3;
    ctot1 = 10;
    amap.put("a", 5);
    bmap.put("b", 4);
    cmap.put("c", 3);
    for (int i = 0; i < atot1; i++) {
      oper.data.process(amap);
    }
    for (int i = 0; i < btot1; i++) {
      oper.data.process(bmap);
    }
    for (int i = 0; i < ctot1; i++) {
      oper.data.process(cmap);
    }

    oper.endWindow();
    Assert.assertEquals("number emitted tuples", 3, matchSink.collectedTuples.size());
    int vcount;
    for (Object o: matchSink.collectedTuples) {
      HashMap<String, HashMap<Integer, Integer>> omap = (HashMap<String, HashMap<Integer, Integer>>)o;
      for (Map.Entry<String, HashMap<Integer, Integer>> e: omap.entrySet()) {
        String key = e.getKey();
        if (key.equals("a")) {
          vcount = e.getValue().get(5);
          Assert.assertEquals("Key \"a\" has value ", 4, vcount);
        }
        else if (key.equals("b")) {
          vcount = e.getValue().get(2);
          Assert.assertEquals("Key \"a\" has value ", 3, vcount);
          vcount = e.getValue().get(4);
          Assert.assertEquals("Key \"a\" has value ", 3, vcount);
        }
        else if (key.equals("c")) {
          vcount = e.getValue().get(4);
          Assert.assertEquals("Key \"a\" has value ", 6, vcount);
        }
      }
    }
  }
}