dubbo Streams 源码

  • 2022-10-20
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dubbo Streams 代码

文件路径:/dubbo-common/src/main/java/org/apache/dubbo/common/function/Streams.java

/*
 * 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.dubbo.common.function;

import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Stream;

import static java.util.stream.Collectors.toList;
import static java.util.stream.StreamSupport.stream;
import static org.apache.dubbo.common.function.Predicates.and;
import static org.apache.dubbo.common.function.Predicates.or;

/**
 * The utilities class for {@link Stream}
 *
 * @since 2.7.5
 */
public interface Streams {

    static <T, S extends Iterable<T>> Stream<T> filterStream(S values, Predicate<T> predicate) {
        return stream(values.spliterator(), false).filter(predicate);
    }

    static <T, S extends Iterable<T>> List<T> filterList(S values, Predicate<T> predicate) {
        return filterStream(values, predicate).collect(toList());
    }

    static <T, S extends Iterable<T>> Set<T> filterSet(S values, Predicate<T> predicate) {
        // new Set with insertion order
        return filterStream(values, predicate).collect(LinkedHashSet::new, Set::add, Set::addAll);
    }

    static <T, S extends Iterable<T>> S filter(S values, Predicate<T> predicate) {
        final boolean isSet = Set.class.isAssignableFrom(values.getClass());
        return (S) (isSet ? filterSet(values, predicate) : filterList(values, predicate));
    }

    static <T, S extends Iterable<T>> S filterAll(S values, Predicate<T>... predicates) {
        return filter(values, and(predicates));
    }

    static <T, S extends Iterable<T>> S filterAny(S values, Predicate<T>... predicates) {
        return filter(values, or(predicates));
    }

    static <T> T filterFirst(Iterable<T> values, Predicate<T>... predicates) {
        return stream(values.spliterator(), false)
                .filter(and(predicates))
                .findFirst()
                .orElse(null);
    }
}

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