Package org.apache.druid.java.util.common.collect

Class Utils

java.lang.Object

org.apache.druid.java.util.common.collect.Utils

public class Utils
extends Object

Constructor Summary

Constructors

Constructor	Description
Utils()

Method Summary

Modifier and Type	Method	Description
static <T> boolean	isPrefix(List<T> small, List<T> big)
static <T> Iterator<T>	mergeSorted(Iterable<? extends Iterator<? extends T>> sortedIterators, Comparator<? super T> comparator)	Like Guava's Iterators.mergeSorted(Iterable, Comparator), but avoids calling next() on any iterator prior to returning the value returned by the previous call to next().
static <T> List<T>	nullableListOf(T... elements)
static String	safeObjectClassGetName(Object o)
static <K, V> Map<K,V>	zipMapPartial(Iterable<K> keys, Iterable<V> values)	Create a Map from iterables of keys and values.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Utils

public Utils()

Method Details

zipMapPartial

public static <K,
V> Map<K,V> zipMapPartial(Iterable<K> keys,
 Iterable<V> values)

Create a Map from iterables of keys and values. If there are more keys than values, or more values than keys, the excess will be omitted.

nullableListOf

@SafeVarargs
public static <T> List<T> nullableListOf(@Nullable
 T... elements)

isPrefix

public static <T> boolean isPrefix(List<T> small,
 List<T> big)

safeObjectClassGetName

public static String safeObjectClassGetName(@Nullable
 Object o)

mergeSorted

public static <T> Iterator<T> mergeSorted(Iterable<? extends Iterator<? extends T>> sortedIterators,
 Comparator<? super T> comparator)

Like Guava's Iterators.mergeSorted(Iterable, Comparator), but avoids calling next() on any iterator prior to returning the value returned by the previous call to next(). This is important when merging iterators that reuse container objects across calls to next(). If the Iterators are CloseableIterator, use CloseableIterators.mergeSorted(java.util.List<? extends org.apache.druid.java.util.common.parsers.CloseableIterator<? extends T>>, java.util.Comparator<T>) instead.