/*
* Copyright 2015, 2016 Tagir Valeev
*
* Licensed 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 one.util.streamex;
import static org.junit.Assert.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Spliterator;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.function.Function;
import java.util.stream.Stream;
import org.junit.FixMethodOrder;
import org.junit.Test;
import org.junit.runners.MethodSorters;
/**
* @author Tagir Valeev
*/
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
public class BaseStreamExTest {
@Test
public void testSpliterator() {
Spliterator<Integer> spltr = Arrays.spliterator(new Integer[] {1,2,3});
StreamEx<Integer> s = StreamEx.of(spltr);
assertFalse(s.isParallel());
assertSame(spltr, s.spliterator());
}
@Test(expected = IllegalStateException.class)
public void testSpliteratorConsumed() {
StreamEx<Integer> s = StreamEx.of(1, 2, 3);
assertNotNull(s.spliterator());
s.spliterator();
}
@Test(expected = IllegalStateException.class)
public void testStreamConsumed() {
StreamEx<Integer> s = StreamEx.of(1, 2, 3);
assertNotNull(s.spliterator());
s.count();
}
@Test
public void testClose() {
List<String> closeHandlers = new ArrayList<>();
StreamEx<Integer> stream = StreamEx.of(Stream.of(1,2,3).onClose(() -> closeHandlers.add("Orig stream")))
.onClose(() -> closeHandlers.add("StreamEx"))
.map(x -> x*2)
.onClose(() -> closeHandlers.add("After map"))
.pairMap((a, b) -> a+b)
.onClose(() -> closeHandlers.add("After pairMap"))
.append(4)
.onClose(() -> closeHandlers.add("After append"))
.prepend(Stream.of(5).onClose(() -> closeHandlers.add("Prepended Stream")))
.prepend(StreamEx.of(6).onClose(() -> closeHandlers.add("Prepended StreamEx")));
assertEquals(Arrays.asList(6, 5, 6, 10, 4), stream.toList());
assertTrue(closeHandlers.isEmpty());
stream.close();
assertEquals(Arrays.asList("Orig stream", "StreamEx", "After map", "After pairMap", "After append",
"Prepended Stream", "Prepended StreamEx"), closeHandlers);
closeHandlers.clear();
stream.close();
assertTrue(closeHandlers.isEmpty());
}
@Test
public void testCloseException() {
AtomicBoolean flag = new AtomicBoolean();
Function<String, Runnable> ex = str -> () -> {throw new IllegalStateException(str);};
StreamEx<Integer> stream = StreamEx.of(Stream.of(1,2,3).onClose(ex.apply("Orig stream")))
.onClose(ex.apply("StreamEx"))
.map(x -> x*2)
.onClose(() -> flag.set(true))
.pairMap((a, b) -> a+b)
.onClose(ex.apply("After pairMap"))
.append(4)
.onClose(ex.apply("After append"))
.prepend(Stream.of(5).onClose(ex.apply("Prepended Stream")))
.prepend(StreamEx.of(6).onClose(ex.apply("Prepended StreamEx")));
assertEquals(Arrays.asList(6, 5, 6, 10, 4), stream.toList());
try {
stream.close();
}
catch(IllegalStateException e) {
assertEquals("Orig stream", e.getMessage());
assertEquals(Arrays.asList("StreamEx", "After pairMap", "After append", "Prepended Stream",
"Prepended StreamEx"), StreamEx.of(e.getSuppressed()).map(IllegalStateException.class::cast).map(
Throwable::getMessage).toList());
assertTrue(flag.get());
return;
}
fail("No exception");
}
@Test
public void testChain() {
assertArrayEquals(new double[] { 2, 2, 6, 2, 6 }, IntStreamEx.of(3, 4, 5).chain(IntStreamEx::boxed).chain(
s -> s.flatMapToLong(LongStreamEx::range)).chain(s -> s.filter(n -> n % 2 != 0).asDoubleStream()).chain(
s -> s.map(x -> x * 2)).toArray(), 0.0);
}
}