Java example source code file (UnorderedTest.java)

This example Java source code file (UnorderedTest.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

biconsumer, checkclearorderedop, function, lambdatesthelpers\:\:assertcontentsequal, list, override, sink, test, util, wrappingunaryoperator

The UnorderedTest.java Java example source code

/*
 * Copyright (c) 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.Test;

import java.util.Arrays;
import java.util.List;
import java.util.function.BiConsumer;
import java.util.function.Function;
import java.util.function.UnaryOperator;

@Test
public class UnorderedTest extends OpTestCase {

    @Test(dataProvider = "StreamTestData<Integer>", dataProviderClass = StreamTestDataProvider.class)
    public void testTerminalOps(String name, TestData<Integer, Stream data) {
        testTerminal(data, s -> { s.forEach(x -> { }); return 0; });

        testTerminal(data, s -> s.findAny(), (a, b) -> assertEquals(a.isPresent(), b.isPresent()));

        testTerminal(data, s -> s.anyMatch(e -> true));
    }


    private <T, R> void testTerminal(TestData> data, Function, R> terminalF) {
        testTerminal(data, terminalF, LambdaTestHelpers::assertContentsEqual);
    }

    static class WrappingUnaryOperator<S> implements UnaryOperator {

        final boolean isLimit;
        final UnaryOperator<S> uo;

        WrappingUnaryOperator(UnaryOperator<S> uo) {
            this(uo, false);
        }

        WrappingUnaryOperator(UnaryOperator<S> uo, boolean isLimit) {
            this.uo = uo;
            this.isLimit = isLimit;
        }

        @Override
        public S apply(S s) {
            return uo.apply(s);
        }
    }

    static <S> WrappingUnaryOperator wrap(UnaryOperator uo) {
        return new WrappingUnaryOperator<>(uo);
    }

    static <S> WrappingUnaryOperator wrap(UnaryOperator uo, boolean isLimit) {
        return new WrappingUnaryOperator<>(uo, isLimit);
    }

    @SuppressWarnings("rawtypes")
    private List permutationOfFunctions =
            LambdaTestHelpers.perm(Arrays.<WrappingUnaryOperator>asList(
                    wrap(s -> s.sorted()),
                    wrap(s -> s.distinct()),
                    wrap(s -> s.limit(5), true)
            ));

    @SuppressWarnings("unchecked")
    private <T, R> void testTerminal(TestData> data,
                                     Function<Stream terminalF,
                                     BiConsumer<R, R> equalityAsserter) {
        testTerminal(data, terminalF, equalityAsserter, permutationOfFunctions, StreamShape.REFERENCE);
    }

    //

    @Test(dataProvider = "IntStreamTestData", dataProviderClass = IntStreamTestDataProvider.class)
    public void testIntTerminalOps(String name, TestData.OfInt data) {
        testIntTerminal(data, s -> { s.forEach(x -> { }); return 0; });
        testIntTerminal(data, s -> s.findAny(), (a, b) -> assertEquals(a.isPresent(), b.isPresent()));
        testIntTerminal(data, s -> s.anyMatch(e -> true));
    }


    private <T, R> void testIntTerminal(TestData.OfInt data, Function terminalF) {
        testIntTerminal(data, terminalF, LambdaTestHelpers::assertContentsEqual);
    }

    private List<List> intPermutationOfFunctions =
            LambdaTestHelpers.perm(Arrays.asList(
                    wrap(s -> s.sorted()),
                    wrap(s -> s.distinct()),
                    wrap(s -> s.limit(5), true)
            ));

    private <R> void testIntTerminal(TestData.OfInt data,
                                     Function<IntStream, R> terminalF,
                                     BiConsumer<R, R> equalityAsserter) {
        testTerminal(data, terminalF, equalityAsserter, intPermutationOfFunctions, StreamShape.INT_VALUE);
    }

    //

    @Test(dataProvider = "LongStreamTestData", dataProviderClass = LongStreamTestDataProvider.class)
    public void testLongTerminalOps(String name, TestData.OfLong data) {
        testLongTerminal(data, s -> { s.forEach(x -> { }); return 0; });
        testLongTerminal(data, s -> s.findAny(), (a, b) -> assertEquals(a.isPresent(), b.isPresent()));
        testLongTerminal(data, s -> s.anyMatch(e -> true));
    }


    private <T, R> void testLongTerminal(TestData.OfLong data, Function terminalF) {
        testLongTerminal(data, terminalF, LambdaTestHelpers::assertContentsEqual);
    }

    private List<List> longPermutationOfFunctions =
            LambdaTestHelpers.perm(Arrays.asList(
                    wrap(s -> s.sorted()),
                    wrap(s -> s.distinct()),
                    wrap(s -> s.limit(5), true)
            ));

    private <R> void testLongTerminal(TestData.OfLong data,
                                      Function<LongStream, R> terminalF,
                                      BiConsumer<R, R> equalityAsserter) {
        testTerminal(data, terminalF, equalityAsserter, longPermutationOfFunctions, StreamShape.LONG_VALUE);
    }

    //

    @Test(dataProvider = "DoubleStreamTestData", dataProviderClass = DoubleStreamTestDataProvider.class)
    public void testDoubleTerminalOps(String name, TestData.OfDouble data) {
        testDoubleTerminal(data, s -> { s.forEach(x -> { }); return 0; });
        testDoubleTerminal(data, s -> s.findAny(), (a, b) -> assertEquals(a.isPresent(), b.isPresent()));
        testDoubleTerminal(data, s -> s.anyMatch(e -> true));
    }


    private <T, R> void testDoubleTerminal(TestData.OfDouble data, Function terminalF) {
        testDoubleTerminal(data, terminalF, LambdaTestHelpers::assertContentsEqual);
    }

    private List<List> doublePermutationOfFunctions =
            LambdaTestHelpers.perm(Arrays.asList(
                    wrap(s -> s.sorted()),
                    wrap(s -> s.distinct()),
                    wrap(s -> s.limit(5), true)
            ));

    private <R> void testDoubleTerminal(TestData.OfDouble data,
                                        Function<DoubleStream, R> terminalF,
                                        BiConsumer<R, R> equalityAsserter) {
        testTerminal(data, terminalF, equalityAsserter, doublePermutationOfFunctions, StreamShape.DOUBLE_VALUE);
    }

    //

    private <T, S extends BaseStream void testTerminal(TestData data,
                                                                 Function<S, R> terminalF,
                                                                 BiConsumer<R, R> equalityAsserter,
                                                                 List<List> pFunctions,
                                                                 StreamShape shape) {
        CheckClearOrderedOp<T> checkClearOrderedOp = new CheckClearOrderedOp<>(shape);
        for (List<WrappingUnaryOperator f : pFunctions) {
            @SuppressWarnings("unchecked")
            UnaryOperator<S> fi = interpose(f, (S s) -> (S) chain(s, checkClearOrderedOp));
            withData(data).
                    terminal(fi, terminalF).
                    equalator(equalityAsserter).
                    exercise();
        }

        CheckSetOrderedOp<T> checkSetOrderedOp = new CheckSetOrderedOp<>(shape);
        for (List<WrappingUnaryOperator f : pFunctions) {
            @SuppressWarnings("unchecked")
            UnaryOperator<S> fi = interpose(f, (S s) -> (S) chain(s, checkSetOrderedOp));
            withData(data).
                    terminal(fi, s -> terminalF.apply(s.sequential())).
                    equalator(equalityAsserter).
                    exercise();
        }
    }

    static class CheckClearOrderedOp<T> implements StatelessTestOp {
        private final StreamShape shape;

        CheckClearOrderedOp(StreamShape shape) {
            this.shape = shape;
        }

        @Override
        public StreamShape outputShape() {
            return shape;
        }

        @Override
        public StreamShape inputShape() {
            return shape;
        }

        @Override
        public Sink<T> opWrapSink(int flags, boolean parallel, Sink sink) {
            if (parallel) {
                assertTrue(StreamOpFlag.ORDERED.isCleared(flags));
            }

            return sink;
        }
    }

    static class CheckSetOrderedOp<T> extends CheckClearOrderedOp {

        CheckSetOrderedOp(StreamShape shape) {
            super(shape);
        }

        @Override
        public Sink<T> opWrapSink(int flags, boolean parallel, Sink sink) {
            assertTrue(StreamOpFlag.ORDERED.isKnown(flags) || StreamOpFlag.ORDERED.isPreserved(flags));

            return sink;
        }
    }

    private <T, S extends BaseStream
    UnaryOperator<S> interpose(List> fs, UnaryOperator fi) {
        int l = -1;
        for (int i = 0; i < fs.size(); i++) {
            if (fs.get(i).isLimit) {
                l = i;
            }
        }

        final int lastLimitIndex = l;
        return s -> {
            if (lastLimitIndex == -1)
                s = fi.apply(s);
            for (int i = 0; i < fs.size(); i++) {
                s = fs.get(i).apply(s);
                if (i >= lastLimitIndex) {
                    s = fi.apply(s);
                }
            }
            return s;
        };
    }
}