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Java example source code file (DummyStepInterpolatorTest.java)

This example Java source code file (DummyStepInterpolatorTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractstepinterpolator, badstepinterpolator, bytearrayoutputstream, classnotfoundexception, dummystepinterpolator, dummystepinterpolatortest, ioexception, localexception, maxcountexceededexception, objectinputstream, objectoutputstream, override, runtimeexception, test

The DummyStepInterpolatorTest.java Java example source code

/*
 * 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.math3.ode.sampling;


import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import org.apache.commons.math3.exception.MaxCountExceededException;
import org.apache.commons.math3.util.FastMath;
import org.junit.Assert;
import org.junit.Test;

public class DummyStepInterpolatorTest {

  @Test
  public void testNoReset() throws MaxCountExceededException {

    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) {
      Assert.assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

  }

  @Test
  public void testFixedState() throws MaxCountExceededException {

    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) {
        Assert.assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

    interpolator.setInterpolatedTime(0.5);
    result = interpolator.getInterpolatedState();
    for (int i = 0; i < result.length; ++i) {
        Assert.assertTrue(FastMath.abs(result[i] - y[i]) < 1.0e-10);
    }

  }

  @Test
  public void testSerialization()
  throws IOException, ClassNotFoundException, MaxCountExceededException {

    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);

    Assert.assertTrue(bos.size () > 300);
    Assert.assertTrue(bos.size () < 500);

    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) {
        Assert.assertTrue(FastMath.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);
        Assert.fail("an exception should have been thrown");
    } catch (LocalException le) {
        // expected behavior
    }
  }

  private static class BadStepInterpolator extends DummyStepInterpolator {
      public BadStepInterpolator(double[] y, boolean forward) {
          super(y, new double[y.length], forward);
      }
      @Override
      protected void doFinalize() {
          throw new LocalException();
      }
  }

  private static class LocalException extends RuntimeException {
    private static final long serialVersionUID = 1L;
  }

}

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