Package com.amazonaws.kinesisvideo.common.preconditions

Class Preconditions

java.lang.Object

com.amazonaws.kinesisvideo.common.preconditions.Preconditions

public final class Preconditions
extends Object

Method Summary

Modifier and Type	Method	Description
static void	checkArgument(boolean expression)	Validates the expression is true.
static void	checkArgument(boolean expression, Object errorMessage)	Validates the expression is true.
static void	checkArgument(boolean expression, String errorMessageTemplate, Object... errorMessageArgs)	Validates the expression is true.
static <T> T	checkNotNull(T reference)	Validates the object is not null.
static <T> T	checkNotNull(T reference, Object errorMessage)	Validates the object is not null.
static <T> T	checkNotNull(T reference, String errorMessageTemplate, Object... errorMessageArgs)	Validates the object is not null.
static void	checkState(boolean expression)	Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method.
static void	checkState(boolean expression, Object 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

Method Detail

checkArgument

public static void checkArgument(boolean expression)

Validates the expression is true.

Parameters:

expression - a boolean expression

Throws:

IllegalArgumentException - if expression is false

checkArgument

public static void checkArgument(boolean expression,
                                 @Nullable
                                 Object errorMessage)

Validates the expression is true.

Parameters:

expression - a boolean expression

errorMessage - Error message to use.

Throws:

IllegalArgumentException - if expression is false

checkArgument

public static void checkArgument(boolean expression,
                                 @Nullable
                                 String errorMessageTemplate,
                                 @Nullable
                                 Object... errorMessageArgs)

Validates the expression is true.

Parameters:

expression - a boolean expression

errorMessageTemplate - String template

errorMessageArgs - Arguments for the string template

Throws:

IllegalArgumentException - if expression is false

NullPointerException - if the check fails and either errorMessageTemplate or errorMessageArgs is null (don't let this happen)

checkNotNull

public static <T> T checkNotNull(T reference)

Validates the object is not null.

Parameters:

reference - an object reference

Returns:

the non-null reference that was validated

Throws:

NullPointerException - if reference is null

checkNotNull

public static <T> T checkNotNull(T reference,
                                 @Nullable
                                 Object errorMessage)

Validates the object is not null.

Parameters:

reference - an object reference

errorMessage - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

Returns:

the non-null reference that was validated

Throws:

NullPointerException - if reference is null

checkNotNull

public static <T> T checkNotNull(T reference,
                                 @Nullable
                                 String errorMessageTemplate,
                                 @Nullable
                                 Object... errorMessageArgs)

Validates the object is not null.

Parameters:

reference - an object reference

errorMessageTemplate - Template to be used in the message.

errorMessageArgs - Arguments to be supplied to the message

Returns:

the non-null reference that was validated

Throws:

NullPointerException - if reference is null

checkState

public static void checkState(boolean expression)

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

Throws:

IllegalStateException - if expression is false

checkState

public static void checkState(boolean expression,
                              @Nullable
                              Object 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 - the exception message to use if the check fails; will be converted to a string using String.valueOf(Object)

Throws:

IllegalStateException - if expression is false