| java.lang.Object
 org.springframework.util.Assert
| Assert | | abstract public class Assert (Code) | | Assertion utility class that assists in validating arguments.
Useful for identifying programmer errors early and clearly at runtime.
For example, if the contract of a public method states it does not
allow null arguments, Assert can be used to validate that
contract. Doing this clearly indicates a contract violation when it
occurs and protects the class's invariants.
Typically used to validate method arguments rather than configuration
properties, to check for cases that are usually programmer errors rather than
configuration errors. In contrast to config initialization code, there is
usally no point in falling back to defaults in such methods.
This class is similar to JUnit's assertion library. If an argument value is
deemed invalid, an
IllegalArgumentException is thrown (typically).
For example:
Assert.notNull(clazz, "The class must not be null");
Assert.isTrue(i > 0, "The value must be greater than zero");
Mainly for internal use within the framework; consider Jakarta's Commons Lang
>= 2.0 for a more comprehensive suite of assertion utilities.
author:
Keith Donald
author:
Juergen Hoeller
author:
Colin Sampaleanu
author:
Rob Harrop
since:
1.1.2 |
| Method Summary | |
| public static void | doesNotContain(String textToSearch, String substring, String message)
Assert that the given text does not contain the given substring. | | public static void | doesNotContain(String textToSearch, String substring)
Assert that the given text does not contain the given substring. | | public static void | hasLength(String text, String message)
Assert that the given String is not empty; that is,
it must not be null and not the empty String. | | public static void | hasLength(String text)
Assert that the given String is not empty; that is,
it must not be null and not the empty String. | | public static void | hasText(String text, String message)
Assert that the given String has valid text content; that is, it must not
be null and must contain at least one non-whitespace character. | | public static void | hasText(String text)
Assert that the given String has valid text content; that is, it must not
be null and must contain at least one non-whitespace character. | | public static void | isAssignable(Class superType, Class subType)
Assert that superType.isAssignableFrom(subType) is true. | | public static void | isAssignable(Class superType, Class subType, String message)
Assert that superType.isAssignableFrom(subType) is true.
Assert.isAssignable(Number.class, myClass);
Parameters:
superType - the super type to check against
Parameters:
subType - the sub type to check
Parameters:
message - a message which will be prepended to the message produced bythe function itself, and which may be used to provide context. | | public static void | isInstanceOf(Class clazz, Object obj)
Assert that the provided object is an instance of the provided class. | | public static void | isInstanceOf(Class type, Object obj, String message)
Assert that the provided object is an instance of the provided class.
Assert.instanceOf(Foo.class, foo);
Parameters:
type - the type to check against
Parameters:
obj - the object to check
Parameters:
message - a message which will be prepended to the message produced bythe function itself, and which may be used to provide context. | | public static void | isNull(Object object, String message)
Assert that an object is null . | | public static void | isNull(Object object)
Assert that an object is null . | | public static void | isTrue(boolean expression, String message)
Assert a boolean expression, throwing IllegalArgumentException
if the test result is false. | | public static void | isTrue(boolean expression)
Assert a boolean expression, throwing IllegalArgumentException
if the test result is false. | | public static void | notEmpty(Object[] array, String message)
Assert that an array has elements; that is, it must not be
null and must have at least one element. | | public static void | notEmpty(Object[] array)
Assert that an array has elements; that is, it must not be
null and must have at least one element. | | public static void | notEmpty(Collection collection, String message)
Assert that a collection has elements; that is, it must not be
null and must have at least one element. | | public static void | notEmpty(Collection collection)
Assert that a collection has elements; that is, it must not be
null and must have at least one element. | | public static void | notEmpty(Map map, String message)
Assert that a Map has entries; that is, it must not be null
and must have at least one entry. | | public static void | notEmpty(Map map)
Assert that a Map has entries; that is, it must not be null
and must have at least one entry. | | public static void | notNull(Object object, String message)
Assert that an object is not null . | | public static void | notNull(Object object)
Assert that an object is not null . | | public static void | state(boolean expression, String message)
Assert a boolean expression, throwing IllegalStateException
if the test result is false. | | public static void | state(boolean expression)
Assert a boolean expression, throwing
IllegalStateException if the test result is false. |
| doesNotContain | | public static void doesNotContain(String textToSearch, String substring, String message)(Code) | | 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
Parameters:
substring - the substring to find within the text
Parameters:
message - the exception message to use if the assertion fails |
| doesNotContain | | public static void doesNotContain(String textToSearch, String substring)(Code) | | Assert that the given text does not contain the given substring.
Assert.doesNotContain(name, "rod");
Parameters:
textToSearch - the text to search
Parameters:
substring - the substring to find within the text |
| hasLength | | public static void hasLength(String text, String message)(Code) | | 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
Parameters:
message - the exception message to use if the assertion fails
See Also: StringUtils.hasLength |
| hasLength | | public static void hasLength(String text)(Code) | | Assert that the given String is not empty; that is,
it must not be null and not the empty String.
Assert.hasLength(name);
Parameters:
text - the String to check
See Also: StringUtils.hasLength |
| hasText | | public static void hasText(String text, String message)(Code) | | Assert that the given String has 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
Parameters:
message - the exception message to use if the assertion fails
See Also: StringUtils.hasText |
| hasText | | public static void hasText(String text)(Code) | | Assert that the given String has 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
See Also: StringUtils.hasText |
| isAssignable | | public static void isAssignable(Class superType, Class subType)(Code) | | Assert that superType.isAssignableFrom(subType) is true.
Assert.isAssignable(Number.class, myClass);
Parameters:
superType - the super type to check
Parameters:
subType - the sub type to check
throws:
IllegalArgumentException - if the classes are not assignable |
| isAssignable | | public static void isAssignable(Class superType, Class subType, String message)(Code) | | Assert that superType.isAssignableFrom(subType) is true.
Assert.isAssignable(Number.class, myClass);
Parameters:
superType - the super type to check against
Parameters:
subType - the sub type to check
Parameters:
message - a message which will be prepended to the message produced bythe function itself, and which may be used to provide context. It shouldnormally end in a ": " or ". " so that the function generate message looksok when prepended to it.
throws:
IllegalArgumentException - if the classes are not assignable |
| isInstanceOf | | public static void isInstanceOf(Class clazz, Object obj)(Code) | | Assert that the provided object is an instance of the provided class.
Assert.instanceOf(Foo.class, foo);
Parameters:
clazz - the required class
Parameters:
obj - the object to check
throws:
IllegalArgumentException - if the object is not an instance of clazz
See Also: Class.isInstance |
| isInstanceOf | | public static void isInstanceOf(Class type, Object obj, String message)(Code) | | Assert that the provided object is an instance of the provided class.
Assert.instanceOf(Foo.class, foo);
Parameters:
type - the type to check against
Parameters:
obj - the object to check
Parameters:
message - a message which will be prepended to the message produced bythe function itself, and which may be used to provide context. It shouldnormally end in a ": " or ". " so that the function generate message looksok when prepended to it.
throws:
IllegalArgumentException - if the object is not an instance of clazz
See Also: Class.isInstance |
| isNull | | public static void isNull(Object object, String message)(Code) | | Assert that an object is null .
Assert.isNull(value, "The value must be null");
Parameters:
object - the object to check
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalArgumentException - if the object is not null |
| isNull | | public static void isNull(Object object)(Code) | | Assert that an object is null .
Assert.isNull(value);
Parameters:
object - the object to check
throws:
IllegalArgumentException - if the object is not null |
| isTrue | | public static void isTrue(boolean expression, String message)(Code) | | Assert a boolean expression, throwing IllegalArgumentException
if the test result is false.
Assert.isTrue(i > 0, "The value must be greater than zero");
Parameters:
expression - a boolean expression
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalArgumentException - if expression is false |
| isTrue | | public static void isTrue(boolean expression)(Code) | | Assert a boolean expression, throwing IllegalArgumentException
if the test result is false.
Assert.isTrue(i > 0);
Parameters:
expression - a boolean expression
throws:
IllegalArgumentException - if expression is false |
| notEmpty | | public static void notEmpty(Object[] array, String message)(Code) | | Assert that an array has elements; that is, it must not be
null and must have at least one element.
Assert.notEmpty(array, "The array must have elements");
Parameters:
array - the array to check
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalArgumentException - if the object array is null or has no elements |
| notEmpty | | public static void notEmpty(Object[] array)(Code) | | Assert that an array has elements; that is, it must not be
null and must have at least one element.
Assert.notEmpty(array);
Parameters:
array - the array to check
throws:
IllegalArgumentException - if the object array is null or has no elements |
| notEmpty | | public static void notEmpty(Collection collection, String message)(Code) | | Assert that a collection has elements; that is, it must not be
null and must have at least one element.
Assert.notEmpty(collection, "Collection must have elements");
Parameters:
collection - the collection to check
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalArgumentException - if the collection is null or has no elements |
| notEmpty | | public static void notEmpty(Collection collection)(Code) | | Assert that a collection has elements; that is, it must not be
null and must have at least one element.
Assert.notEmpty(collection, "Collection must have elements");
Parameters:
collection - the collection to check
throws:
IllegalArgumentException - if the collection is null or has no elements |
| notEmpty | | public static void notEmpty(Map map, String message)(Code) | | Assert that a Map has entries; that is, it must not be null
and must have at least one entry.
Assert.notEmpty(map, "Map must have entries");
Parameters:
map - the map to check
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalArgumentException - if the map is null or has no entries |
| notEmpty | | public static void notEmpty(Map map)(Code) | | Assert that a Map has entries; that is, it must not be null
and must have at least one entry.
Assert.notEmpty(map);
Parameters:
map - the map to check
throws:
IllegalArgumentException - if the map is null or has no entries |
| notNull | | public static void notNull(Object object, String message)(Code) | | Assert that an object is not null .
Assert.notNull(clazz, "The class must not be null");
Parameters:
object - the object to check
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalArgumentException - if the object is null |
| notNull | | public static void notNull(Object object)(Code) | | Assert that an object is not null .
Assert.notNull(clazz);
Parameters:
object - the object to check
throws:
IllegalArgumentException - if the object is null |
| state | | public static void state(boolean expression, String message)(Code) | | Assert a boolean expression, throwing IllegalStateException
if the test result is false. Call isTrue if you wish to
throw IllegalArgumentException on an assertion failure.
Assert.state(id == null, "The id property must not already be initialized");
Parameters:
expression - a boolean expression
Parameters:
message - the exception message to use if the assertion fails
throws:
IllegalStateException - if expression is false |
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