com.facebook.spectrum.utils

Class Preconditions

java.lang.Object

com.facebook.spectrum.utils.Preconditions

public final class Preconditions
extends java.lang.Object

Light-weight implementation for Precondition checks.

Method Summary

Modifier and Type	Method and Description
static void	checkArgument(boolean assertion) Asserts that the given assertion about an argument is true.
static <T> T	checkNotNull(T reference) Asserts that the given reference is not null.
static void	checkState(boolean assertion) Asserts that the given assertion about a state is true.

Methods inherited from class java.lang.Object

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

Method Detail

checkNotNull

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

Asserts that the given reference is not null.

Parameters:

reference - A reference that might be null

Returns:

reference if reference is not null

Throws:

java.lang.NullPointerException - if the given reference is null

checkArgument

public static void checkArgument(boolean assertion)

Asserts that the given assertion about an argument is true.

Parameters:

assertion - The assertion to check

Throws:

java.lang.IllegalArgumentException - if the given assertion is false

checkState

public static void checkState(boolean assertion)

Asserts that the given assertion about a state is true.

Parameters:

assertion - The assertion to check

Throws:

java.lang.IllegalStateException - if the given assertion is false