com.uber.sdk.rides.client.utils

Class Preconditions

java.lang.Object

com.uber.sdk.rides.client.utils.Preconditions

public class Preconditions
extends java.lang.Object

Simple static methods to be called at the start of your own methods to verify correct arguments and state.

Constructor Summary

Constructors

Constructor and Description
Preconditions()

Method Summary

Modifier and Type	Method and Description
static <T> java.util.Collection<T>	checkNotEmpty(java.util.Collection<T> collection, java.lang.String errorMessage) Ensures a collection is neither null nor empty.
static <T> T	checkNotNull(T value, java.lang.String errorMessage) Ensures the value is not null.
static void	checkState(boolean expression, java.lang.String errorMessage) Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

Methods inherited from class java.lang.Object

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

Constructor Detail

Preconditions

public Preconditions()

Method Detail

checkState

public static void checkState(boolean expression,
                              @Nonnull
                              java.lang.String errorMessage)

Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.

Parameters:

expression - a boolean expression

errorMessage - error message thrown if expression is false.

Throws:

java.lang.IllegalStateException - if expression is false

checkNotNull

@Nonnull
public static <T> T checkNotNull(T value,
                                          @Nonnull
                                          java.lang.String errorMessage)

Ensures the value is not null.

Type Parameters:

T - type of value.

Parameters:

value - value to be validated.

errorMessage - error message thrown if value is null.

Returns:

value passed in if not null.

checkNotEmpty

@Nonnull
public static <T> java.util.Collection<T> checkNotEmpty(java.util.Collection<T> collection,
                                                                 @Nonnull
                                                                 java.lang.String errorMessage)

Ensures a collection is neither null nor empty.

Type Parameters:

T - type of the collection item.

Parameters:

collection - collection to be validated.

errorMessage - error message to be thrown if collection is null or empty.

Returns:

collection passed in.