/*
* Copyright © 2014 Cask Data, Inc.
*
* 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 co.cask.cdap.api.dataset.lib.cube;
import org.junit.Assert;
import org.junit.Test;
/**
*
*/
public class InterpolatorTest {
@Test
public void testStepInterpolator() {
Interpolator interpolator = new Interpolators.Step();
long startTs = 1;
long endTs = 10;
TimeValue start = new TimeValue(startTs, 5);
TimeValue end = new TimeValue(endTs, 3);
for (long i = startTs; i < endTs; i++) {
Assert.assertEquals(5, interpolator.interpolate(start, end, i));
}
Assert.assertEquals(3, interpolator.interpolate(start, end, endTs));
}
@Test
public void testSmallSlopeLinearInterpolator() {
Interpolator interpolator = new Interpolators.Linear();
TimeValue start = new TimeValue(1, 5);
TimeValue end = new TimeValue(5, 3);
Assert.assertEquals(5, interpolator.interpolate(start, end, 1));
Assert.assertEquals(5, interpolator.interpolate(start, end, 2));
Assert.assertEquals(4, interpolator.interpolate(start, end, 3));
Assert.assertEquals(4, interpolator.interpolate(start, end, 4));
Assert.assertEquals(3, interpolator.interpolate(start, end, 5));
}
@Test
public void testBigSlopeLinearInterpolator() {
Interpolator interpolator = new Interpolators.Linear();
TimeValue start = new TimeValue(1, 100);
TimeValue end = new TimeValue(5, 500);
Assert.assertEquals(100, interpolator.interpolate(start, end, 1));
Assert.assertEquals(200, interpolator.interpolate(start, end, 2));
Assert.assertEquals(300, interpolator.interpolate(start, end, 3));
Assert.assertEquals(400, interpolator.interpolate(start, end, 4));
Assert.assertEquals(500, interpolator.interpolate(start, end, 5));
}
@Test
public void testInterpolateLimit() {
long limit = 20;
Interpolator interpolator = new Interpolators.Step(limit);
TimeValue start = new TimeValue(0, 10);
TimeValue end = new TimeValue(limit + 1, 50);
// time between points is greater than this limit, values in between should be 0
for (int i = 1; i < 1 + limit; i++) {
Assert.assertEquals(0, interpolator.interpolate(start, end, i));
}
// time between points is not greater than the limit, values in between should be interpolated
end = new TimeValue(limit, 50);
for (int i = 1; i < limit; i++) {
Assert.assertEquals(10, interpolator.interpolate(start, end, i));
}
}
}