ai.grakn.util

Class CommonUtil

java.lang.Object

ai.grakn.util.CommonUtil

public class CommonUtil
extends Object

Common utility methods used within Grakn. Some of these methods are Grakn-specific, others add important "missing" methods to Java/Guava classes.

Author:

Felix Chapman

Method Summary

Modifier and Type	Method and Description
static <T> Optional<T>	optionalOr(Optional<T>... options)
static <T> java.util.stream.Stream<T>	optionalToStream(Optional<T> optional)
static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableList<T>>	toImmutableList()
static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableMultiset<T>>	toImmutableMultiset()
static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableSet<T>>	toImmutableSet()
static RuntimeException	unreachableStatement(String message)
static RuntimeException	unreachableStatement(String message, Throwable cause)
static RuntimeException	unreachableStatement(Throwable cause)

Methods inherited from class java.lang.Object

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

Method Detail

optionalToStream

public static <T> java.util.stream.Stream<T> optionalToStream(Optional<T> optional)

Type Parameters:

T - the type in the optional

Parameters:

optional - the optional to change into a stream

Returns:

a stream of one item if the optional has an element, else an empty stream

optionalOr

@SafeVarargs
public static <T> Optional<T> optionalOr(Optional<T>... options)

unreachableStatement

@CheckReturnValue
public static RuntimeException unreachableStatement(Throwable cause)

unreachableStatement

@CheckReturnValue
public static RuntimeException unreachableStatement(String message)

unreachableStatement

@CheckReturnValue
public static RuntimeException unreachableStatement(@Nullable
                                                                      String message,
                                                                      Throwable cause)

toImmutableSet

public static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableSet<T>> toImmutableSet()

toImmutableList

public static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableList<T>> toImmutableList()

toImmutableMultiset

public static <T> java.util.stream.Collector<T,?,com.google.common.collect.ImmutableMultiset<T>> toImmutableMultiset()