com.apollographql.apollo.api.internal

Class Utils

java.lang.Object

com.apollographql.apollo.api.internal.Utils

public final class Utils
extends java.lang.Object

Contains utility methods for checking Preconditions

Method Summary

Modifier and Type	Method and Description
static <E> boolean	areDisjoint(java.util.Set<E> setOne, java.util.Set<E> setTwo) Checks if two Set are disjoint.
static <T> T	checkNotNull(T reference) Checks if the object is null.
static <T> T	checkNotNull(T reference, java.lang.Object errorMessage) Checks if the object is null.

Methods inherited from class java.lang.Object

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

Method Detail

checkNotNull

@Nonnull
public static <T> T checkNotNull(T reference,
                                          @Nullable
                                          java.lang.Object errorMessage)

Checks if the object is null. Returns the object if it is not null, else throws a NullPointerException with the error message.

Type Parameters:

T - the value type

Parameters:

reference - the object whose nullability has to be checked

errorMessage - the message to use with the NullPointerException

Returns:

The object itself

Throws:

java.lang.NullPointerException - if the object is null

areDisjoint

public static <E> boolean areDisjoint(java.util.Set<E> setOne,
                                      java.util.Set<E> setTwo)

Checks if two Set are disjoint. Returns true if the sets don't have a single common element. Also returns true if either of the sets is null.

Type Parameters:

E - the value type contained within the sets

Parameters:

setOne - the first set

setTwo - the second set

Returns:

True if the sets don't have a single common element or if either of the sets is null.

checkNotNull

@Nonnull
public static <T> T checkNotNull(T reference)

Checks if the object is null. Returns the object if it is not null, else throws a NullPointerException.

Type Parameters:

T - the value type

Parameters:

reference - the object whose nullability has to be checked

Returns:

The object itself

Throws:

java.lang.NullPointerException - if the object is null