com.codingopus.guava.custom.collectors.ImmutableListCollector.java Source code

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Here is the source code for com.codingopus.guava.custom.collectors.ImmutableListCollector.java

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/*
 * Copyright 2016 Bharat Savani
 *
 *  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 com.codingopus.guava.custom.collectors;

import java.util.stream.Collector;

import com.google.common.collect.ImmutableList;

public final class ImmutableListCollector<T> {

    /**
     * @returns a {@link Collector} that collects data in
     * {@link ImmutableList}.
     * 
     * @param <T> The type of input elements for the new collector.
     * */
    public static <T> Collector<T, ImmutableList.Builder<T>, ImmutableList<T>> toListCollector() {

        return Collector.of(ImmutableList.Builder<T>::new, ImmutableList.Builder<T>::add,
                (left, right) -> left.addAll(right.build()), ImmutableList.Builder<T>::build);
    }
}