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59 changes: 59 additions & 0 deletions
59
oak-commons/src/main/java/org/apache/jackrabbit/oak/commons/collections/StreamUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| * 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.jackrabbit.oak.commons.collections; | ||
|
|
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| import org.jetbrains.annotations.NotNull; | ||
|
|
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| import java.util.Iterator; | ||
| import java.util.Objects; | ||
| import java.util.stream.Stream; | ||
| import java.util.stream.StreamSupport; | ||
|
|
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| public class StreamUtils { | ||
|
|
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| private StreamUtils() { | ||
| // no instances for you | ||
| } | ||
|
|
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| /** | ||
| * Generates a (non-parallel) {@linkplain Stream} for the {@linkplain Iterable} | ||
| * @param iterable iterable to convert | ||
| * @return the stream | ||
| */ | ||
| @NotNull | ||
| public static <T> Stream<T> toStream(@NotNull Iterable<T> iterable) { | ||
| Objects.requireNonNull(iterable); | ||
| return StreamSupport.stream(iterable.spliterator(), false); | ||
| } | ||
|
|
||
| /** | ||
| * Generates a (non-parallel) {@linkplain Stream} for the | ||
| * {@linkplain Iterable} | ||
| * <p> | ||
| * This method is not thread-safe | ||
| * | ||
| * @param iterator | ||
| * iterator to convert | ||
| * @return the stream (representing the remaining elements in the iterator) | ||
| */ | ||
| @NotNull | ||
| public static <T> Stream<T> toStream(@NotNull Iterator<T> iterator) { | ||
| return StreamSupport.stream(CollectionUtils.toIterable(iterator).spliterator(), false); | ||
| } | ||
| } |
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57 changes: 57 additions & 0 deletions
57
oak-commons/src/test/java/org/apache/jackrabbit/oak/commons/collections/StreamUtilsTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * 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.jackrabbit.oak.commons.collections; | ||
|
|
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| import org.junit.Assert; | ||
| import org.junit.Test; | ||
|
|
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| import java.util.Iterator; | ||
| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
| import java.util.stream.Stream; | ||
|
|
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| public class StreamUtilsTest { | ||
|
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| @Test | ||
| public void iteratorToStream() { | ||
| List<String> input = List.of("a", "b", "c"); | ||
| Iterator<String> iterator = input.iterator(); | ||
| Stream<String> stream = StreamUtils.toStream(iterator); | ||
| List<String> result = stream.collect(Collectors.toList()); | ||
| Assert.assertEquals(input.toString(), result.toString()); | ||
| } | ||
|
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| @Test(expected = NullPointerException.class) | ||
| public void iteratorToStreamNull() { | ||
| StreamUtils.toStream((Iterator)null); | ||
| } | ||
|
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| @Test | ||
| public void iterableToStream() { | ||
| List<String> input = List.of("a", "b", "c"); | ||
| Stream<String> stream = StreamUtils.toStream(input); | ||
| List<String> result = stream.collect(Collectors.toList()); | ||
| Assert.assertEquals(input.toString(), result.toString()); | ||
| } | ||
|
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| @Test(expected = NullPointerException.class) | ||
| public void iterableStreamNull() { | ||
| StreamUtils.toStream((Iterable)null); | ||
| } | ||
| } |
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