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Extend the class library with the part of Spliterators that is used by Google Guava (#443)

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Add class library support for the part of Spliterators that is used by Google Guava.
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Colorize 2019-12-09 09:29:16 +01:00 committed by Alexey Andreev
parent 9d0a53175a
commit dd255f9da0
2 changed files with 218 additions and 0 deletions
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120
classlib/src/main/java/org/teavm/classlib/java/util/TSpliterators.java Normal file
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/*
* Copyright 2017 Alexey Andreev.
*
* 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 org.teavm.classlib.java.util;
import java.util.Collection;
import java.util.Iterator;
import java.util.function.Consumer;
import java.util.function.IntConsumer;
public class TSpliterators {
private TSpliterators() {
}
public static <T> TSpliterator<T> spliterator(Object[] array, int additionalCharacteristics) {
return new TSpliterator<T>() {
private int index;
@Override
public boolean tryAdvance(Consumer<? super T> action) {
if (index >= array.length) {
return false;
}
action.accept((T) array[index]);
index++;
return true;
}
@Override
public TSpliterator<T> trySplit() {
return null;
}
@Override
public long estimateSize() {
return array.length;
}
@Override
public int characteristics() {
return additionalCharacteristics | TSpliterator.SIZED;
}
};
}
public static <T> TSpliterator<T> spliterator(Collection<? extends T> c, int characteristics) {
return ((TCollection) c).spliterator();
}
public static TSpliterator.OfInt spliterator(int[] array, int additionalCharacteristics) {
return spliterator(array, 0, array.length, additionalCharacteristics);
}
public static TSpliterator.OfInt spliterator(int[] array, int fromIndex, int toIndex,
int additionalCharacteristics) {
return new TSpliterator.OfInt() {
int index = fromIndex;
@Override
public TSpliterator.OfInt trySplit() {
return null;
}
@Override
public boolean tryAdvance(IntConsumer action) {
if (index < toIndex) {
action.accept(array[index]);
index++;
return true;
} else {
return false;
}
}
};
}
public static <T> TSpliterator<T> spliterator(Iterator<? extends T> iterator,
long size, int characteristics) {
return new TSpliterator<T>() {
@Override
public boolean tryAdvance(Consumer<? super T> action) {
if (iterator.hasNext()) {
action.accept(iterator.next());
return true;
} else {
return false;
}
}
@Override
public TSpliterator<T> trySplit() {
return null;
}
@Override
public long estimateSize() {
return size;
}
@Override
public int characteristics() {
return characteristics;
}
};
}
}

98
classlib/src/test/java/org/teavm/classlib/java/util/SpliteratorsTest.java Normal file
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/*
* Copyright 2015 Alexey Andreev.
*
* 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 org.teavm.classlib.java.util;
import static org.junit.Assert.assertArrayEquals;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Consumer;
import java.util.function.IntConsumer;
import org.junit.Test;
public class SpliteratorsTest {
@Test
public void intSpliterator() {
int[] values = {1, 2, 3, 4, 5};
TSpliterator.OfInt spliterator = TSpliterators.spliterator(values, 0, 5, 0);
List<Integer> collected = new ArrayList<>();
IntConsumer collector = value -> collected.add((Integer) value);
assertTrue(spliterator.tryAdvance(collector));
assertTrue(spliterator.tryAdvance(collector));
assertTrue(spliterator.tryAdvance(collector));
assertTrue(spliterator.tryAdvance(collector));
assertTrue(spliterator.tryAdvance(collector));
assertFalse(spliterator.tryAdvance(collector));
assertEquals(Arrays.asList(1, 2, 3, 4, 5), collected);
}
@Test
public void intSpliteratorWithSubRange() {
int[] values = {1, 2, 3, 4, 5};
TSpliterator.OfInt spliterator = TSpliterators.spliterator(values, 1, 4, 0);
List<Integer> collected = new ArrayList<>();
IntConsumer collector = value -> collected.add((Integer) value);
assertTrue(spliterator.tryAdvance(collector));
assertTrue(spliterator.tryAdvance(collector));
assertTrue(spliterator.tryAdvance(collector));
assertFalse(spliterator.tryAdvance(collector));
assertEquals(Arrays.asList(2, 3, 4), collected);
}
@Test
public void spliteratorFromIterator() {
List<Integer> values = Arrays.asList(1, 2, 3);
TSpliterator<Integer> spliterator = TSpliterators.spliterator(values.iterator(),
values.size(), 0);
assertEquals(3L, spliterator.estimateSize());
}
@Test
public void spliteratorFromObjectArray() {
Object[] array = {1, 2, 3, 4};
TSpliterator<Integer> spliterator = TSpliterators.spliterator(array, 0);
List<Object> collected = new ArrayList<>();
Consumer<Object> collector = value -> collected.add(value);
spliterator.tryAdvance(collector);
spliterator.tryAdvance(collector);
array[2] = 9;
spliterator.tryAdvance(collector);
spliterator.tryAdvance(collector);
spliterator.tryAdvance(collector);
assertArrayEquals(new Object[] {1, 2, 9, 4}, array);
assertEquals(4L, spliterator.estimateSize());
}
}