com.yanzhenjie.andserver.util

Class Assert

java.lang.Object

com.yanzhenjie.andserver.util.Assert

public abstract class Assert
extends java.lang.Object

Created by Zhenjie Yan on 2018/7/5.

Constructor Summary

Constructors

Constructor and Description
Assert()

Method Summary

Modifier and Type	Method and Description
static void	doesNotContain(java.lang.String textToSearch, java.lang.String substring, java.lang.String message) Assert that the given text does not contain the given substring.
static void	hasLength(java.lang.String text, java.lang.String message) Assert that the given String is not empty; that is, it must not be null and not the empty String.
static void	hasText(java.lang.String text, java.lang.String message) Assert that the given String contains valid text content; that is, it must not be null and must contain at least one non-whitespace character.
static void	isAssignable(java.lang.Class<?> superType, java.lang.Class<?> subType) Assert that superType.isAssignableFrom(subType) is true.
static void	isAssignable(java.lang.Class<?> superType, java.lang.Class<?> subType, java.lang.String message) Assert that superType.isAssignableFrom(subType) is true.
static void	isInstanceOf(java.lang.Class<?> type, java.lang.Object obj) Assert that the provided object is an instance of the provided class.
static void	isInstanceOf(java.lang.Class<?> type, java.lang.Object obj, java.lang.String message) Assert that the provided object is an instance of the provided class.
static void	isNull(java.lang.Object object, java.lang.String message) Assert that an object is null.
static void	isTrue(boolean expression, java.lang.String message) Assert a boolean expression, throwing an IllegalArgumentException if the expression evaluates to false.
static void	noNullElements(java.lang.Object[] array, java.lang.String message) Assert that an array contains no null elements.
static void	notEmpty(java.util.Collection<?> collection, java.lang.String message) Assert that a collection contains elements; that is, it must not be null and must contain at least one element.
static void	notEmpty(java.util.Map<?,?> map, java.lang.String message) Assert that a Map contains entries; that is, it must not be null and must contain at least one entry.
static void	notEmpty(java.lang.Object[] array, java.lang.String message) Assert that an array contains elements; that is, it must not be null and must contain at least one element.
static void	notNull(java.lang.Object object, java.lang.String message) Assert that an object is not null.
static void	state(boolean expression, java.lang.String message) Assert a boolean expression, throwing an IllegalStateException if the expression evaluates to false.

Methods inherited from class java.lang.Object

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

Constructor Detail

Assert

public Assert()

Method Detail

state

public static void state(boolean expression,
                         java.lang.String message)

Assert a boolean expression, throwing an IllegalStateException if the expression evaluates to false.

Call isTrue(boolean, java.lang.String) if you wish to throw an IllegalArgumentException on an assertion failure.

Assert.state(id == null, "The id property must not already be initialized");

Parameters:

expression - a boolean expression.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalStateException - if expression is false

isTrue

public static void isTrue(boolean expression,
                          java.lang.String message)

Assert a boolean expression, throwing an IllegalArgumentException if the expression evaluates to false.

Assert.isTrue(i > 0, "The value must be greater than zero");

Parameters:

expression - a boolean expression.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if expression is false.

isNull

public static void isNull(java.lang.Object object,
                          java.lang.String message)

Assert that an object is null.

Assert.isNull(value, "The value must be null");

Parameters:

object - the object to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the object is not null.

notNull

public static void notNull(java.lang.Object object,
                           java.lang.String message)

Assert that an object is not null.

Assert.notNull(clazz, "The class must not be null");

Parameters:

object - the object to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the object is null

hasLength

public static void hasLength(java.lang.String text,
                             java.lang.String message)

Assert that the given String is not empty; that is, it must not be null and not the empty String.

Assert.hasLength(name, "Name must not be empty");

Parameters:

text - the String to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the text is empty.

hasText

public static void hasText(java.lang.String text,
                           java.lang.String message)

Assert that the given String contains valid text content; that is, it must not be null and must contain at least one non-whitespace character.

Assert.hasText(name, "'name' must not be empty");

Parameters:

text - the String to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the text does not contain valid text content.

doesNotContain

public static void doesNotContain(java.lang.String textToSearch,
                                  java.lang.String substring,
                                  java.lang.String message)

Assert that the given text does not contain the given substring.

Assert .doesNotContain(name, "rod", "Name must not contain 'rod'");

Parameters:

textToSearch - the text to search.

substring - the substring to find within the text.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the text contains the substring.

notEmpty

public static void notEmpty(java.lang.Object[] array,
                            java.lang.String message)

Assert that an array contains elements; that is, it must not be null and must contain at least one element.

Assert.notEmpty(array, "The array must contain elements");

Parameters:

array - the array to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the object array is null or contains no elements.

noNullElements

public static void noNullElements(java.lang.Object[] array,
                                  java.lang.String message)

Assert that an array contains no null elements.

Note: Does not complain if the array is empty!

Assert.noNullElements(array, "The array must contain non-null elements");

Parameters:

array - the array to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the object array contains a null element.

notEmpty

public static void notEmpty(java.util.Collection<?> collection,
                            java.lang.String message)

Assert that a collection contains elements; that is, it must not be null and must contain at least one element.

Assert.notEmpty(collection, "Collection must contain elements");

Parameters:

collection - the collection to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the collection is null or contains no elements.

notEmpty

public static void notEmpty(java.util.Map<?,?> map,
                            java.lang.String message)

Assert that a Map contains entries; that is, it must not be null and must contain at least one entry.

Assert.notEmpty(map, "Map must contain entries");

Parameters:

map - the map to check.

message - the exception message to use if the assertion fails.

Throws:

java.lang.IllegalArgumentException - if the map is null or contains no entries.

isInstanceOf

public static void isInstanceOf(java.lang.Class<?> type,
                                java.lang.Object obj,
                                java.lang.String message)

Assert that the provided object is an instance of the provided class.

Assert.instanceOf(Foo.class, foo, "Foo expected");

Parameters:

type - the type to check against.

obj - the object to check.

message - a message which will be prepended to provide further context. If it is empty or ends in ":" or ";" or "," or ".", a full exception message will be appended. If it ends in a space, the name of the offending object's type will be appended. In any other case, a ":" with a space and the name of the offending object's type will be appended.

Throws:

java.lang.IllegalArgumentException - if the object is not an instance of type.

isInstanceOf

public static void isInstanceOf(java.lang.Class<?> type,
                                java.lang.Object obj)

Assert that the provided object is an instance of the provided class.

Assert.instanceOf(Foo.class, foo);

Parameters:

type - the type to check against.

obj - the object to check.

Throws:

java.lang.IllegalArgumentException - if the object is not an instance of type.

isAssignable

public static void isAssignable(java.lang.Class<?> superType,
                                java.lang.Class<?> subType,
                                java.lang.String message)

Assert that superType.isAssignableFrom(subType) is true.

Assert.isAssignable(Number.class, myClass, "Number expected");

Parameters:

superType - the super type to check against.

subType - the sub type to check.

message - a message which will be prepended to provide further context. If it is empty or ends in ":" or ";" or "," or ".", a full exception message will be appended. If it ends in a space, the name of the offending sub type will be appended. In any other case, a ":" with a space and the name of the offending sub type will be appended.

Throws:

java.lang.IllegalArgumentException - if the classes are not assignable.

isAssignable

public static void isAssignable(java.lang.Class<?> superType,
                                java.lang.Class<?> subType)

Assert that superType.isAssignableFrom(subType) is true.

Assert.isAssignable(Number.class, myClass);

Parameters:

superType - the super type to check.

subType - the sub type to check.

Throws:

java.lang.IllegalArgumentException - if the classes are not assignable.