/*
* 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.commons.math.ode.sampling;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import org.apache.commons.math.ode.DerivativeException;
import org.apache.commons.math.ode.sampling.AbstractStepInterpolator;
import org.apache.commons.math.ode.sampling.DummyStepInterpolator;
import org.junit.Test;
public class DummyStepInterpolatorTest {
@Test
public void testNoReset() throws DerivativeException {
double[] y = { 0.0, 1.0, -2.0 };
DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
interpolator.storeTime(0);
interpolator.shift();
interpolator.storeTime(1);
double[] result = interpolator.getInterpolatedState();
for (int i = 0; i < result.length; ++i) {
assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
}
}
@Test
public void testFixedState()
throws DerivativeException {
double[] y = { 1.0, 3.0, -4.0 };
DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
interpolator.storeTime(0);
interpolator.shift();
interpolator.storeTime(1);
interpolator.setInterpolatedTime(0.1);
double[] result = interpolator.getInterpolatedState();
for (int i = 0; i < result.length; ++i) {
assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
}
interpolator.setInterpolatedTime(0.5);
result = interpolator.getInterpolatedState();
for (int i = 0; i < result.length; ++i) {
assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
}
}
@Test
public void testSerialization()
throws DerivativeException, IOException, ClassNotFoundException {
double[] y = { 0.0, 1.0, -2.0 };
DummyStepInterpolator interpolator = new DummyStepInterpolator(y, new double[y.length], true);
interpolator.storeTime(0);
interpolator.shift();
interpolator.storeTime(1);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
oos.writeObject(interpolator);
assertTrue(bos.size () > 150);
assertTrue(bos.size () < 250);
ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
ObjectInputStream ois = new ObjectInputStream(bis);
DummyStepInterpolator dsi = (DummyStepInterpolator) ois.readObject();
dsi.setInterpolatedTime(0.5);
double[] result = dsi.getInterpolatedState();
for (int i = 0; i < result.length; ++i) {
assertTrue(Math.abs(result[i] - y[i]) < 1.0e-10);
}
}
@Test
public void testImpossibleSerialization()
throws IOException {
double[] y = { 0.0, 1.0, -2.0 };
AbstractStepInterpolator interpolator = new BadStepInterpolator(y, true);
interpolator.storeTime(0);
interpolator.shift();
interpolator.storeTime(1);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(bos);
try {
oos.writeObject(interpolator);
fail("an exception should have been thrown");
} catch (IOException ioe) {
// expected behavior
assertEquals(0, ioe.getMessage().length());
} catch (Exception e) {
fail("wrong exception caught");
}
}
private static class BadStepInterpolator extends DummyStepInterpolator {
@SuppressWarnings("unused")
public BadStepInterpolator() {
}
public BadStepInterpolator(double[] y, boolean forward) {
super(y, new double[y.length], forward);
}
@Override
protected void doFinalize()
throws DerivativeException {
throw new DerivativeException(null);
}
}
}