org.assertj.core.util

Class Preconditions

java.lang.Object

org.assertj.core.util.Preconditions

public final class Preconditions
extends Object

Verifies correct argument values and state. Borrowed from Guava.

Author:

alruiz@google.com (Alex Ruiz)

Field Summary

Fields

Modifier and Type	Field and Description
static String	ARGUMENT_EMPTY

Method Summary

Modifier and Type	Method and Description
static void	checkArgument(boolean expression, String errorMessageTemplate, Object... errorMessageArgs) Ensures the truth of an expression involving one or more parameters to the calling method.
static <T> void	checkNotNull(FilterOperator<T> filterOperator) Verifies that the given FilterOperator reference is not null.
static <T> T	checkNotNull(T reference) Verifies that the given object reference is not null.
static <T> T	checkNotNull(T reference, String message) Verifies that the given object reference is not null.
static CharSequence	checkNotNullOrEmpty(CharSequence s) Verifies that the given CharSequence is not null or empty.
static CharSequence	checkNotNullOrEmpty(CharSequence s, String message) Verifies that the given CharSequence is not null or empty.
static <T> T[]	checkNotNullOrEmpty(T[] array) Verifies that the given array is not null or empty.
static void	checkState(boolean expression, String errorMessageTemplate, Object... errorMessageArgs) 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

Field Detail

ARGUMENT_EMPTY

public static final String ARGUMENT_EMPTY

See Also:

Constant Field Values

Method Detail

checkNotNullOrEmpty

public static CharSequence checkNotNullOrEmpty(CharSequence s)

Verifies that the given CharSequence is not null or empty.

Parameters:

s - the given CharSequence.

Returns:

the validated CharSequence.

Throws:

NullPointerException - if the given CharSequence is null.

IllegalArgumentException - if the given CharSequence is empty.

checkNotNullOrEmpty

public static CharSequence checkNotNullOrEmpty(CharSequence s,
                                               String message)

Verifies that the given CharSequence is not null or empty.

Parameters:

s - the given CharSequence.

message - error message in case of empty String.

Returns:

the validated CharSequence.

Throws:

NullPointerException - if the given CharSequence is null.

IllegalArgumentException - if the given CharSequence is empty.

checkNotNullOrEmpty

public static <T> T[] checkNotNullOrEmpty(T[] array)

Verifies that the given array is not null or empty.

Type Parameters:

T - the type of elements of the array.

Parameters:

array - the given array.

Returns:

the validated array.

Throws:

NullPointerException - if the given array is null.

IllegalArgumentException - if the given array is empty.

checkNotNull

public static <T> T checkNotNull(T reference)

Verifies that the given object reference is not null.

Type Parameters:

T - the type of the reference to check.

Parameters:

reference - the given object reference.

Returns:

the non-null reference that was validated.

Throws:

NullPointerException - if the given object reference is null.

checkNotNull

public static <T> T checkNotNull(T reference,
                                 String message)

Verifies that the given object reference is not null.

Type Parameters:

T - the type of the reference to check.

Parameters:

reference - the given object reference.

message - error message in case of null reference.

Returns:

the non-null reference that was validated.

Throws:

NullPointerException - if the given object reference is null.

checkNotNull

public static <T> void checkNotNull(FilterOperator<T> filterOperator)

Verifies that the given FilterOperator reference is not null.

Type Parameters:

T - the type of the FilterOperator to check.

Parameters:

filterOperator - the given FilterOperator reference.

Throws:

IllegalArgumentException - if the given FilterOperator reference is null.

checkArgument

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

Ensures the truth of an expression involving one or more parameters to the calling method.

Borrowed from Guava.

Parameters:

expression - a boolean expression

errorMessageTemplate - a template for the exception message should the check fail. The message is formed by calling String.format(String, Object...) with the given parameters.

errorMessageArgs - the arguments to be substituted into the message template.

Throws:

IllegalArgumentException - if expression is false

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

checkState

public static void checkState(boolean expression,
                              String errorMessageTemplate,
                              Object... errorMessageArgs)

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

Borrowed from Guava.

Parameters:

expression - a boolean expression

errorMessageTemplate - a template for the exception message should the check fail.The message is formed by calling String.format(String, Object...) with the given parameters.

errorMessageArgs - the arguments to be substituted into the message template. Arguments are converted to strings using String.valueOf(Object).

Throws:

IllegalStateException - if expression is false

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