org.onlab.util.GuavaCollectors Maven / Gradle / Ivy
/*
* Copyright 2015-present Open Networking Foundation
*
* 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.onlab.util;
import java.util.stream.Collector;
import java.util.stream.Collector.Characteristics;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
/**
* Implementations of {@link Collector} that implement various useful reduction
* operations, such as accumulating elements into Guava collections.
*/
public final class GuavaCollectors {
/**
* Returns a {@code Collector} that accumulates the input elements into a
* new ImmutableSet.
*
* @param type
* @return a {@code Collector} which collects all the input elements into a
* {@code ImmutableSet}
*
* @deprecated in 1.11.0 consider using {@link ImmutableSet#toImmutableSet()} instead.
*/
@Deprecated
public static Collector, ImmutableSet> toImmutableSet() {
return Collector.of(ImmutableSet.Builder::new,
ImmutableSet.Builder::add,
(s, r) -> s.addAll(r.build()),
ImmutableSet.Builder::build,
Characteristics.UNORDERED);
}
/**
* Returns a {@code Collector} that accumulates the input elements into a
* new ImmutableList.
*
* @param type
* @return a {@code Collector} which collects all the input elements into a
* {@code ImmutableList}, in encounter order
*
* @deprecated in 1.11.0 consider using {@link ImmutableList#toImmutableList()} instead.
*/
@Deprecated
public static Collector, ImmutableList> toImmutableList() {
return Collector.of(ImmutableList.Builder::new,
ImmutableList.Builder::add,
(s, r) -> s.addAll(r.build()),
ImmutableList.Builder::build);
}
private GuavaCollectors() {}
}