Commons Math example source code file (CertifiedDataAbstractTest.java)

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

Java - Commons Math tags/keywords

bufferedreader, bufferedreader, descriptivestatistics, double, double, exception, illegalaccessexception, io, net, network, object, object, override, reflection, string, string, summarystatistics, testcase, util

The Commons Math CertifiedDataAbstractTest.java 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.math.stat.data;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

import junit.framework.TestCase;

import org.apache.commons.math.TestUtils;
import org.apache.commons.math.stat.descriptive.DescriptiveStatistics;
import org.apache.commons.math.stat.descriptive.SummaryStatistics;

/**
 * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $
 */
public abstract class CertifiedDataAbstractTest extends TestCase {

    private DescriptiveStatistics descriptives;

    private SummaryStatistics summaries;

    private Map<String, Double> certifiedValues;

    @Override
    protected void setUp() throws Exception {
        descriptives = new DescriptiveStatistics();
        summaries = new SummaryStatistics();
        certifiedValues = new HashMap<String, Double>();

        loadData();
    }

    private void loadData() throws IOException {
        BufferedReader in = null;

        try {
            URL resourceURL = getClass().getClassLoader().getResource(getResourceName());
            in = new BufferedReader(new InputStreamReader(resourceURL.openStream()));

            String line = in.readLine();
            while (line != null) {

                /* this call to StringUtils did little for the
                 * following conditional structure
                 */
                line = line.trim();

                // not empty line or comment
                if (!("".equals(line) || line.startsWith("#"))) {
                    int n = line.indexOf('=');
                    if (n == -1) {
                        // data value
                        double value = Double.parseDouble(line);
                        descriptives.addValue(value);
                        summaries.addValue(value);
                    } else {
                        // certified value
                        String name = line.substring(0, n).trim();
                        String valueString = line.substring(n + 1).trim();
                        Double value = Double.valueOf(valueString);
                        certifiedValues.put(name, value);
                    }
                }
                line = in.readLine();
            }
        } finally {
            if (in != null) {
                in.close();
            }
        }
    }

    protected abstract String getResourceName();

    protected double getMaximumAbsoluteError() {
        return 1.0e-5;
    }

    @Override
    protected void tearDown() throws Exception {
        descriptives.clear();
        descriptives = null;

        summaries.clear();
        summaries = null;

        certifiedValues.clear();
        certifiedValues = null;
    }

    public void testCertifiedValues() {
        for (String name : certifiedValues.keySet()) {
            Double expectedValue = certifiedValues.get(name);

            Double summariesValue = getProperty(summaries, name);
            if (summariesValue != null) {
                TestUtils.assertEquals("summary value for " + name + " is incorrect.",
                                       summariesValue.doubleValue(), expectedValue.doubleValue(),
                                       getMaximumAbsoluteError());
            }

            Double descriptivesValue = getProperty(descriptives, name);
            if (descriptivesValue != null) {
                TestUtils.assertEquals("descriptive value for " + name + " is incorrect.",
                                       descriptivesValue.doubleValue(), expectedValue.doubleValue(),
                                       getMaximumAbsoluteError());
            }
        }
    }


    protected Double getProperty(Object bean, String name) {
        try {
            // Get the value of prop
            String prop = "get" + name.substring(0,1).toUpperCase() + name.substring(1);
            Method meth = bean.getClass().getMethod(prop, new Class[0]);
            Object property = meth.invoke(bean, new Object[0]);
            if (meth.getReturnType().equals(Double.TYPE)) {
                return (Double) property;
            } else if (meth.getReturnType().equals(Long.TYPE)) {
                return Double.valueOf(((Long) property).doubleValue());
            } else {
                fail("wrong type: " + meth.getReturnType().getName());
            }
        } catch (NoSuchMethodException nsme) {
            // ignored
        } catch (InvocationTargetException ite) {
            fail(ite.getMessage());
        } catch (IllegalAccessException iae) {
            fail(iae.getMessage());
        }
        return null;
    }
}