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Java example source code file (StatisticalReferenceDatasetFactory.java)

This example Java source code file (StatisticalReferenceDatasetFactory.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

bufferedreader, deprecated, derivativestructure, inputstreamreader, ioexception, override, statisticalreferencedataset, statisticalreferencedatasetfactory, string

The StatisticalReferenceDatasetFactory.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.optimization.general;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.apache.commons.math3.analysis.differentiation.DerivativeStructure;

/**
 * A factory to create instances of {@link StatisticalReferenceDataset} from
 * available resources.
 */
@Deprecated
public class StatisticalReferenceDatasetFactory {

    private StatisticalReferenceDatasetFactory() {
        // Do nothing
    }

    /**
     * Creates a new buffered reader from the specified resource name.
     *
     * @param name the name of the resource
     * @return a buffered reader
     * @throws IOException if an I/O error occurred
     */
    public static BufferedReader createBufferedReaderFromResource(final String name)
        throws IOException {
        final InputStream resourceAsStream;
        resourceAsStream = StatisticalReferenceDatasetFactory.class
            .getResourceAsStream(name);
        if (resourceAsStream == null) {
            throw new IOException("could not find resource " + name);
        }
        return new BufferedReader(new InputStreamReader(resourceAsStream));
    }

    public static StatisticalReferenceDataset createKirby2()
        throws IOException {
        final BufferedReader in = createBufferedReaderFromResource("Kirby2.dat");
        StatisticalReferenceDataset dataset = null;
        try {
            dataset = new StatisticalReferenceDataset(in) {

                @Override
                public DerivativeStructure getModelValue(final double x, final DerivativeStructure[] a) {
                    final DerivativeStructure p = a[0].add(a[1].add(a[2].multiply(x)).multiply(x));
                    final DerivativeStructure q = a[3].add(a[4].multiply(x)).multiply(x).add(1.0);
                    return p.divide(q);
                }

            };
        } finally {
            in.close();
        }
        return dataset;
    }

    public static StatisticalReferenceDataset createHahn1()
        throws IOException {
        final BufferedReader in = createBufferedReaderFromResource("Hahn1.dat");
        StatisticalReferenceDataset dataset = null;
        try {
            dataset = new StatisticalReferenceDataset(in) {

                @Override
                public DerivativeStructure getModelValue(final double x, final DerivativeStructure[] a) {
                    final DerivativeStructure p = a[0].add(a[1].add(a[2].add(a[3].multiply(x)).multiply(x)).multiply(x));
                    final DerivativeStructure q = a[4].add(a[5].add(a[6].multiply(x)).multiply(x)).multiply(x).add(1.0);
                    return p.divide(q);
                }

            };
        } finally {
            in.close();
        }
        return dataset;
    }

    public static StatisticalReferenceDataset createMGH17()
        throws IOException {
        final BufferedReader in = createBufferedReaderFromResource("MGH17.dat");
        StatisticalReferenceDataset dataset = null;
        try {
            dataset = new StatisticalReferenceDataset(in) {

                @Override
                public DerivativeStructure getModelValue(final double x, final DerivativeStructure[] a) {
                    return a[0].add(a[1].multiply(a[3].multiply(-x).exp())).add(a[2].multiply(a[4].multiply(-x).exp()));
                }

            };
        } finally {
            in.close();
        }
        return dataset;
    }

    public static StatisticalReferenceDataset createLanczos1()
        throws IOException {
        final BufferedReader in =
            createBufferedReaderFromResource("Lanczos1.dat");
        StatisticalReferenceDataset dataset = null;
        try {
            dataset = new StatisticalReferenceDataset(in) {

                @Override
                public DerivativeStructure getModelValue(final double x, final DerivativeStructure[] a) {
                    return a[0].multiply(a[3].multiply(-x).exp()).add(
                                a[1].multiply(a[4].multiply(-x).exp())).add(
                                     a[2].multiply(a[5].multiply(-x).exp()));
                }

            };
        } finally {
            in.close();
        }
        return dataset;
    }

    /**
     * Returns an array with all available reference datasets.
     *
     * @return the array of datasets
     * @throws IOException if an I/O error occurs
     */
    public StatisticalReferenceDataset[] createAll()
        throws IOException {
        return new StatisticalReferenceDataset[] {
            createKirby2(), createMGH17()
        };
    }
}

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