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Java example source code file (StreamTestDataProvider.java)

This example Java source code file (StreamTestDataProvider.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

arraylist, collection, dataprovider, delegatingstream, hashset, integer, linkedhashset, linkedlist, object, spinedbuffer, streamtestdataprovider, supplier, treeset, util

The StreamTestDataProvider.java Java example source code

/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package java.util.stream;

import org.testng.annotations.DataProvider;

import java.util.*;
import java.util.Spliterators;
import java.util.function.Supplier;

/**
 * StreamTestDataProvider
 *
 * @author Brian Goetz
 */
/** TestNG DataProvider for ref-valued streams */
public class StreamTestDataProvider {
    private static final Integer[] to0 = new Integer[0];
    private static final Integer[] to1 = new Integer[1];
    private static final Integer[] to10 = new Integer[10];
    private static final Integer[] to100 = new Integer[100];
    private static final Integer[] to1000 = new Integer[1000];
    private static final Integer[] reversed = new Integer[100];
    private static final Integer[] ones = new Integer[100];
    private static final Integer[] twice = new Integer[200];
    private static final Integer[] pseudoRandom;

    private static final Object[][] testData;
    private static final Object[][] withNullTestData;
    private static final Object[][] spliteratorTestData;

    static {
        Integer[][] arrays = {to0, to1, to10, to100, to1000};
        for (Integer[] arr : arrays) {
            for (int i = 0; i < arr.length; i++) {
                arr[i] = i;
            }
        }
        for (int i = 0; i < reversed.length; i++) {
            reversed[i] = reversed.length - i;
        }
        for (int i = 0; i < ones.length; i++) {
            ones[i] = 1;
        }
        System.arraycopy(to100, 0, twice, 0, to100.length);
        System.arraycopy(to100, 0, twice, to100.length, to100.length);
        pseudoRandom = new Integer[LambdaTestHelpers.LONG_STRING.length()];
        for (int i = 0; i < LambdaTestHelpers.LONG_STRING.length(); i++) {
            pseudoRandom[i] = (int) LambdaTestHelpers.LONG_STRING.charAt(i);
        }
    }

    static final Object[][] arrays = {
            {"empty", to0},
            {"0..1", to1},
            {"0..10", to10},
            {"0..100", to100},
            {"0..1000", to1000},
            {"100x[1]", ones},
            {"2x[0..100]", twice},
            {"reverse 0..100", reversed},
            {"pseudorandom", pseudoRandom}
    };

    static {
        {
            List<Object[]> list = new ArrayList<>();
            for (Object[] data : arrays) {
                final Object name = data[0];
                final Integer[] ints = (Integer[])data[1];
                final List<Integer> intsAsList = Arrays.asList(ints);

                list.add(arrayDataDescr("array:" + name, ints));
                list.add(collectionDataDescr("ArrayList.asList:" + name, intsAsList));
                list.add(collectionDataDescr("ArrayList:" + name, new ArrayList<>(intsAsList)));
                list.add(streamDataDescr("DelegatingStream(ArrayList):" + name,
                                         () -> new ArrayList<>(intsAsList).stream()));
                List<Integer> aList = new ArrayList<>(intsAsList);
                if (LambdaTestMode.isNormalMode()) {
                    // Only include sub-lists for normal test execution mode
                    // This data is serialization-hostile since the state of the
                    // deserialized sub-list will be out of sync with the
                    // enclosing list.
                    list.add(collectionDataDescr("ArrayList.Sublist:" + name,
                                                 (ints.length) <= 1 ? aList.subList(0, 0) : aList.subList(1, ints.length / 2)));
                }
                list.add(collectionDataDescr("LinkedList:" + name, new LinkedList<>(intsAsList)));
                list.add(collectionDataDescr("HashSet:" + name, new HashSet<>(intsAsList)));
                list.add(collectionDataDescr("LinkedHashSet:" + name, new LinkedHashSet<>(intsAsList)));
                list.add(collectionDataDescr("TreeSet:" + name, new TreeSet<>(intsAsList)));
                SpinedBuffer<Integer> spinedBuffer = new SpinedBuffer<>();
                intsAsList.forEach(spinedBuffer);
                list.add(sbDataDescr("SpinedBuffer:" + name, spinedBuffer));

                // @@@ Add more
            }
            testData = list.toArray(new Object[0][]);
        }

        // Simple combination of numbers and null values, probably excessive but may catch
        // errors for initialization/termination/sequence
        // @@@ This is separate from the other data for now until nulls are consitently supported by
        // all operations
        {
            List<Object[]> list = new ArrayList<>();
            int size = 5;
            for (int i = 0; i < (1 << size) - 2; i++) {
                Integer[] content = new Integer[size];
                for (int e = 0; e < size; e++) {
                    content[e] = (i & (1 << e)) > 0 ? e + 1 : null;
                }

                // ORDERED
                list.add(arrayDataDescr("array:" + i, content));
                // not ORDERED, DISTINCT
                list.add(collectionDataDescr("HashSet:" + i, new HashSet<>(Arrays.asList(content))));
            }

            withNullTestData = list.toArray(new Object[0][]);
        }

        {
            List<Object[]> spliterators = new ArrayList<>();
            for (Object[] data : arrays) {
                final Object name = data[0];
                final Integer[] ints = (Integer[])data[1];

                spliterators.add(splitDescr("Arrays.s(array):" + name,
                                            () -> Arrays.spliterator(ints)));
                spliterators.add(splitDescr("arrays.s(array,o,l):" + name,
                                            () -> Arrays.spliterator(ints, 0, ints.length/2)));
                spliterators.add(splitDescr("SpinedBuffer.s():" + name,
                                            () -> {
                                                SpinedBuffer<Integer> sb = new SpinedBuffer<>();
                                                for (Integer i : ints)
                                                    sb.accept(i);
                                                return sb.spliterator();
                                            }));
                spliterators.add(splitDescr("Iterators.s(Arrays.s(array).iterator(), size):" + name,
                                            () -> Spliterators.spliterator(Arrays.asList(ints).iterator(), ints.length, 0)));
                spliterators.add(splitDescr("Iterators.s(Arrays.s(array).iterator()):" + name,
                                            () -> Spliterators.spliteratorUnknownSize(Arrays.asList(ints).iterator(), 0)));
                // @@@ Add map and collection spliterators when spliterator() is exposed on Collection or Iterable
            }
            spliteratorTestData = spliterators.toArray(new Object[0][]);
        }
    }

    static <T> Object[] arrayDataDescr(String description, T[] data) {
        return new Object[] { description, TestData.Factory.ofArray(description, data)};
    }

    static <T> Object[] streamDataDescr(String description, Supplier> supplier) {
        return new Object[] { description, TestData.Factory.ofSupplier(description, supplier)};
    }

    static <T> Object[] collectionDataDescr(String description, Collection data) {
        return new Object[] { description, TestData.Factory.ofCollection(description, data)};
    }

    static <T> Object[] sbDataDescr(String description, SpinedBuffer data) {
        return new Object[] { description, TestData.Factory.ofSpinedBuffer(description, data)};
    }

    static <T> Object[] splitDescr(String description, Supplier> ss) {
        return new Object[] { description, ss };
    }

    // Return an array of ( String name, StreamTestData<Integer> )
    @DataProvider(name = "StreamTestData<Integer>")
    public static Object[][] makeStreamTestData() {
        return testData;
    }

    @DataProvider(name = "withNull:StreamTestData<Integer>")
    public static Object[][] makeStreamWithNullTestData() {
        return withNullTestData;
    }

    // returns an array of (String name, Supplier<Spliterator)
    @DataProvider(name = "Spliterator<Integer>")
    public static Object[][] spliteratorProvider() {
        return spliteratorTestData;
    }
}

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