tv.danmaku.ijk.media.drm.util

Class Assertions

java.lang.Object

tv.danmaku.ijk.media.drm.util.Assertions

public final class Assertions
extends java.lang.Object

Provides methods for asserting the truth of expressions and properties.

Method Summary

Modifier and Type	Method and Description
static void	checkArgument(boolean expression) Throws IllegalArgumentException if expression evaluates to false.
static void	checkArgument(boolean expression, java.lang.Object errorMessage) Throws IllegalArgumentException if expression evaluates to false.
static <T> T	checkNotNull(T reference) Throws NullPointerException if reference is null.
static void	checkState(boolean expression) Throws IllegalStateException if expression evaluates to false.
static void	checkState(boolean expression, java.lang.Object errorMessage) Throws IllegalStateException if expression evaluates to false.
static <T> T	checkStateNotNull(T reference, java.lang.Object errorMessage) Throws IllegalStateException if reference is null.

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)

Throws IllegalArgumentException if expression evaluates to false.

Parameters:

expression - The expression to evaluate.

Throws:

java.lang.IllegalArgumentException - If expression is false.

checkArgument

public static void checkArgument(boolean expression,
                                 java.lang.Object errorMessage)

Throws IllegalArgumentException if expression evaluates to false.

Parameters:

expression - The expression to evaluate.

errorMessage - The exception message if an exception is thrown. The message is converted to a String using String.valueOf(Object).

Throws:

java.lang.IllegalArgumentException - If expression is false.

checkState

public static void checkState(boolean expression)

Throws IllegalStateException if expression evaluates to false.

Parameters:

expression - The expression to evaluate.

Throws:

java.lang.IllegalStateException - If expression is false.

checkState

public static void checkState(boolean expression,
                              java.lang.Object errorMessage)

Throws IllegalStateException if expression evaluates to false.

Parameters:

expression - The expression to evaluate.

errorMessage - The exception message if an exception is thrown. The message is converted to a String using String.valueOf(Object).

Throws:

java.lang.IllegalStateException - If expression is false.

checkStateNotNull

public static <T> T checkStateNotNull(T reference,
                                      java.lang.Object errorMessage)

Throws IllegalStateException if reference is null.

Type Parameters:

T - The type of the reference.

Parameters:

reference - The reference.

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

Returns:

The non-null reference that was validated.

Throws:

java.lang.IllegalStateException - If reference is null.

checkNotNull

public static <T> T checkNotNull(T reference)

Throws NullPointerException if reference is null.

Type Parameters:

T - The type of the reference.

Parameters:

reference - The reference.

Returns:

The non-null reference that was validated.

Throws:

java.lang.NullPointerException - If reference is null.