Example usage for java.util.function BinaryOperator maxBy

Introduction

In this page you can find the example usage for java.util.function BinaryOperator maxBy.

Prototype

public static <T> BinaryOperator<T> maxBy(Comparator<? super T> comparator) 

Source Link

Document

Returns a BinaryOperator which returns the greater of two elements according to the specified Comparator .

Usage

From source file:Main.java

public static void main(String[] args) {
    BinaryOperator<Integer> bi = BinaryOperator.maxBy(Comparator.reverseOrder());
    System.out.println(bi.apply(2, 3));
}

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From source file:Main.java

public static void main(String... args) {
    Comparator<Food> dishCaloriesComparator = Comparator.comparingInt(Food::getCalories);
    BinaryOperator<Food> moreCaloricOf = BinaryOperator.maxBy(dishCaloriesComparator);
    Food o = Food.menu.stream().collect(Collectors.reducing(moreCaloricOf)).get();
    System.out.println(o);//ww w . ja v  a2  s.  c o m

}

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From source file:org.apache.storm.daemon.logviewer.utils.LogCleaner.java

/**
 * Return the last modified time for all log files in a worker's log dir.
 * Using stream rather than File.listFiles is to avoid large mem usage
 * when a directory has too many files./*from  w ww. j a v a 2 s  . c om*/
 */
private long lastModifiedTimeWorkerLogdir(File logDir) {
    long dirModified = logDir.lastModified();

    DirectoryStream<Path> dirStream = null;
    try {
        dirStream = directoryCleaner.getStreamForDirectory(logDir);
    } catch (IOException e) {
        return dirModified;
    }

    if (dirStream == null) {
        return dirModified;
    }

    try {
        return StreamSupport.stream(dirStream.spliterator(), false).reduce(dirModified, (maximum, path) -> {
            long curr = path.toFile().lastModified();
            return curr > maximum ? curr : maximum;
        }, BinaryOperator.maxBy(Long::compareTo));
    } catch (Exception ex) {
        LOG.error(ex.getMessage(), ex);
        return dirModified;
    } finally {
        if (DirectoryStream.class.isInstance(dirStream)) {
            IOUtils.closeQuietly(dirStream);
        }
    }
}

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