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RATIS-52 Refactor RaftUtils into different classes
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63 changes: 63 additions & 0 deletions
63
ratis-common/src/main/java/org/apache/ratis/util/CollectionUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * * | ||
| * * 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. | ||
| * | ||
| */ | ||
|
|
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| package org.apache.ratis.util; | ||
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| import java.util.Iterator; | ||
| import java.util.Objects; | ||
| import java.util.function.Function; | ||
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| public interface CollectionUtils { | ||
| /** | ||
| * @return the next element in the iteration right after the given element; | ||
| * if the given element is not in the iteration, return the first one | ||
| */ | ||
| static <T> T next(final T given, final Iterable<T> iteration) { | ||
| Objects.requireNonNull(given, "given == null"); | ||
| final Iterator<T> i = Objects.requireNonNull(iteration, "iteration == null").iterator(); | ||
| Preconditions.assertTrue(i.hasNext(), "iteration is empty."); | ||
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| final T first = i.next(); | ||
| for(T current = first; i.hasNext(); ) { | ||
| final T next = i.next(); | ||
| if (given.equals(current)) { | ||
| return next; | ||
| } | ||
| current = next; | ||
| } | ||
| return first; | ||
| } | ||
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| static <INPUT, OUTPUT> Iterable<OUTPUT> as( | ||
| Iterable<INPUT> iteration, Function<INPUT, OUTPUT> converter) { | ||
| return () -> new Iterator<OUTPUT>() { | ||
| final Iterator<INPUT> i = iteration.iterator(); | ||
| @Override | ||
| public boolean hasNext() { | ||
| return i.hasNext(); | ||
| } | ||
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|
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| @Override | ||
| public OUTPUT next() { | ||
| return converter.apply(i.next()); | ||
| } | ||
| }; | ||
| } | ||
| } |
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