library/src/test/java/com/datatorrent/lib/math/ChangeKeyValTest.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.math;

import org.junit.Assert;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.datatorrent.lib.testbench.CollectorTestSink;
import com.datatorrent.lib.util.KeyValPair;

/**
 *
 * Functional tests for {@link com.datatorrent.lib.math.ChangeKeyVal}.
 * <p>
 *
 */
public class ChangeKeyValTest
{
	private static Logger log = LoggerFactory.getLogger(ChangeKeyValTest.class);

	/**
	 * Test node logic emits correct results.
	 */
	@Test
	public void testNodeProcessing() throws Exception
	{
		testNodeProcessingSchema(new ChangeKeyVal<String, Integer>());
		testNodeProcessingSchema(new ChangeKeyVal<String, Double>());
		testNodeProcessingSchema(new ChangeKeyVal<String, Float>());
		testNodeProcessingSchema(new ChangeKeyVal<String, Short>());
		testNodeProcessingSchema(new ChangeKeyVal<String, Long>());
	}

	/**
	 *
	 * @param oper
	 *          key/value pair for comparison.
	 */
	@SuppressWarnings({ "rawtypes", "unchecked" })
  public <V extends Number> void testNodeProcessingSchema(
			ChangeKeyVal<String, V> oper)
	{
		CollectorTestSink changeSink = new CollectorTestSink();
		CollectorTestSink percentSink = new CollectorTestSink();

		oper.change.setSink(changeSink);
		oper.percent.setSink(percentSink);

		oper.beginWindow(0);
		oper.base.process(new KeyValPair<String, V>("a", oper.getValue(2)));
		oper.base.process(new KeyValPair<String, V>("b", oper.getValue(10)));
		oper.base.process(new KeyValPair<String, V>("c", oper.getValue(100)));

		oper.data.process(new KeyValPair<String, V>("a", oper.getValue(3)));
		oper.data.process(new KeyValPair<String, V>("b", oper.getValue(2)));
		oper.data.process(new KeyValPair<String, V>("c", oper.getValue(4)));

		oper.endWindow();

		// One for each key
		Assert.assertEquals("number emitted tuples", 3,
				changeSink.collectedTuples.size());
		Assert.assertEquals("number emitted tuples", 3,
				percentSink.collectedTuples.size());

		log.debug("\nLogging tuples");
		for (Object o : changeSink.collectedTuples) {
			KeyValPair<String, Number> kv = (KeyValPair<String, Number>) o;
			if (kv.getKey().equals("a")) {
				Assert.assertEquals("change in a ", 1.0, kv.getValue());
			}
			if (kv.getKey().equals("b")) {
				Assert.assertEquals("change in b ", -8.0, kv.getValue());
			}
			if (kv.getKey().equals("c")) {
				Assert.assertEquals("change in c ", -96.0, kv.getValue());
			}
		}

		for (Object o : percentSink.collectedTuples) {
			KeyValPair<String, Number> kv = (KeyValPair<String, Number>) o;
			if (kv.getKey().equals("a")) {
				Assert.assertEquals("change in a ", 50.0, kv.getValue());
			}
			if (kv.getKey().equals("b")) {
				Assert.assertEquals("change in b ", -80.0, kv.getValue());
			}
			if (kv.getKey().equals("c")) {
				Assert.assertEquals("change in c ", -96.0, kv.getValue());
			}
		}
	}
}