Example usage for com.google.common.collect MinMaxPriorityQueue.Builder create

Introduction

In this page you can find the example usage for com.google.common.collect MinMaxPriorityQueue.Builder create.

Prototype

public static <E extends Comparable<E>> MinMaxPriorityQueue<E> create() 

Source Link

Document

Creates a new min-max priority queue with default settings: natural order, no maximum size, no initial contents, and an initial expected size of 11.

Usage

From source file:com.linkedin.pinot.core.query.aggregation.groupby.AggregationGroupByOperatorService.java

/**
 * Returns a MinMaxPriorityQueue with the given size limit, and ordering.
 * Will return null if the value to be inserted is not an instance of comparable.
 *
 * @param sampleObject To determine if the object is Comparable.
 * @param maxSize The max size for the heap.
 * @param reverseOrder True if sorting order to be reversed.
 * @return/*  w w w .ja  v a 2s .  c om*/
 */
private static MinMaxPriorityQueue<ImmutablePair<Serializable, String>> getMinMaxPriorityQueue(
        Serializable sampleObject, int maxSize, boolean reverseOrder) {
    if (!(sampleObject instanceof Comparable)) {
        return null;
    }

    Comparator<ImmutablePair<Serializable, String>> comparator = new GroupByResultComparator<ImmutablePair<Serializable, String>>()
            .newComparator(reverseOrder);

    MinMaxPriorityQueue.Builder<ImmutablePair<Serializable, String>> minMaxPriorityQueueBuilder = MinMaxPriorityQueue
            .orderedBy(comparator).maximumSize(maxSize);

    return minMaxPriorityQueueBuilder.create();
}

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