/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.core.util.collection;
import com.google.common.collect.ImmutableSet;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collector;
/**
* {@link Collector} that returns a {@link ImmutableSet}
*
* @param <T> the generic type of the elements in the {@link Set}
* @since 4.0
*/
public class ImmutableSetCollector<T> implements Collector<T, ImmutableSet.Builder<T>, Set<T>> {
@Override
public Supplier<ImmutableSet.Builder<T>> supplier() {
return ImmutableSet::builder;
}
@Override
public BiConsumer<ImmutableSet.Builder<T>, T> accumulator() {
return (builder, value) -> builder.add(value);
}
@Override
public BinaryOperator<ImmutableSet.Builder<T>> combiner() {
return (left, right) -> {
left.addAll(right.build());
return left;
};
}
@Override
public Function<ImmutableSet.Builder<T>, Set<T>> finisher() {
return ImmutableSet.Builder::build;
}
@Override
public Set<Characteristics> characteristics() {
return ImmutableSet.of(Characteristics.UNORDERED);
}
}