org.springframework.validation
Interface Errors

All Known Implementing Classes:

BindException, EscapedErrors

public interface Errors

Stores and exposes information about data-binding and validation errors for a specific object.

Field names can be properties of the target object (e.g. "name" when binding to a customer object), or nested fields in case of subobjects (e.g. "address.street"). Supports subtree navigation via setNestedPath(String): for example, an AddressValidator validates "address", not being aware that this is a subobject of customer.

Note: Errors objects are single-threaded.

Author:

Rod Johnson, Juergen Hoeller

See Also:

setNestedPath(java.lang.String), BindException, DataBinder, ValidationUtils

Field Summary

static String

NESTED_PATH_SEPARATOR The separator between path elements in a nested path, for example in "customer.name" or "customer.address.street".

Method Summary

void	addAllErrors(Errors errors) Add all errors from the given Errors instance to this Errors instance.
List	getAllErrors() Get all errors, both global and field ones.
int	getErrorCount() Return the total number of errors.
FieldError	getFieldError(String field) Get the first error associated with the given field, if any.
int	getFieldErrorCount(String field) Return the number of errors associated with the given field.
List	getFieldErrors(String field) Get all errors associated with the given field.
Object	getFieldValue(String field) Return the current value of the given field, either the current bean property value or a rejected update from the last binding.
ObjectError	getGlobalError() Get the first global error, if any.
int	getGlobalErrorCount() Return the number of global errors.
List	getGlobalErrors() Get all global errors.
String	getNestedPath() Return the current nested path of this Errors object.
String	getObjectName() Return the name of the bound root object.
boolean	hasErrors() Return if there were any errors.
boolean	hasFieldErrors(String field) Are there any errors associated with the given field?
boolean	hasGlobalErrors() Are there any global errors?
void	popNestedPath() Pop the former nested path from the nested path stack.
void	pushNestedPath(String subPath) Push the given sub path onto the nested path stack.
void	reject(String errorCode) Register a global error for the entire target object, using the given error description.
void	reject(String errorCode, Object[] errorArgs, String defaultMessage) Register a global error for the entire target object, using the given error description.
void	reject(String errorCode, String defaultMessage) Register a global error for the entire target object, using the given error description.
void	rejectValue(String field, String errorCode) Register a field error for the specified field of the current object (respecting the current nested path, if any), using the given error description.
void	rejectValue(String field, String errorCode, Object[] errorArgs, String defaultMessage) Register a field error for the specified field of the current object (respecting the current nested path, if any), using the given error description.
void	rejectValue(String field, String errorCode, String defaultMessage) Register a field error for the specified field of the current object (respecting the current nested path, if any), using the given error description.
void	setNestedPath(String nestedPath) Allow context to be changed so that standard validators can validate subtrees.

Field Detail

NESTED_PATH_SEPARATOR

static final String NESTED_PATH_SEPARATOR

The separator between path elements in a nested path, for example in "customer.name" or "customer.address.street".

"." = same as the nested property separator in the beans package.

See Also:

Constant Field Values

Method Detail

getObjectName

String getObjectName()

Return the name of the bound root object.

setNestedPath

void setNestedPath(String nestedPath)

Allow context to be changed so that standard validators can validate subtrees. Reject calls prepend the given path to the field names.

For example, an address validator could validate the subobject "address" of a customer object.

Parameters:

nestedPath - nested path within this object, e.g. "address" (defaults to "", null is also acceptable). Can end with a dot: both "address" and "address." are valid.

getNestedPath

String getNestedPath()

Return the current nested path of this Errors object.

Returns a nested path with a dot, i.e. "address.", for easy building of concatenated paths. Default is an empty String.

pushNestedPath

void pushNestedPath(String subPath)

Push the given sub path onto the nested path stack.

A popNestedPath() call will reset the original nested path before the corresponding pushNestedPath(String) call.

Using the nested path stack allows to set temporary nested paths for subobjects without having to worry about a temporary path holder.

For example: current path "spouse.", pushNestedPath("child") -> result path "spouse.child."; popNestedPath() -> "spouse." again.

Parameters:

subPath - the sub path to push onto the nested path stack

See Also:

popNestedPath()

popNestedPath

void popNestedPath()
                   throws IllegalStateException

Pop the former nested path from the nested path stack.

Throws:

IllegalStateException - if there is no former nested path on the stack

See Also:

pushNestedPath(java.lang.String)

reject

void reject(String errorCode)

Register a global error for the entire target object, using the given error description.

Parameters:

errorCode - error code, interpretable as a message key

reject

void reject(String errorCode,
            String defaultMessage)

Register a global error for the entire target object, using the given error description.

Parameters:

errorCode - error code, interpretable as a message key

defaultMessage - fallback default message

reject

void reject(String errorCode,
            Object[] errorArgs,
            String defaultMessage)

Register a global error for the entire target object, using the given error description.

Parameters:

errorCode - error code, interpretable as a message key

errorArgs - error arguments, for argument binding via MessageFormat (can be null)

defaultMessage - fallback default message

rejectValue

void rejectValue(String field,
                 String errorCode)

Register a field error for the specified field of the current object (respecting the current nested path, if any), using the given error description.

The field name may be null or empty String to indicate the current object itself rather than a field of it. This may result in a corresponding field error within the nested object graph or a global error if the current object is the top object.

Parameters:

field - the field name (may be null or empty String)

errorCode - error code, interpretable as a message key

See Also:

getNestedPath()

rejectValue

void rejectValue(String field,
                 String errorCode,
                 String defaultMessage)

Register a field error for the specified field of the current object (respecting the current nested path, if any), using the given error description.

The field name may be null or empty String to indicate the current object itself rather than a field of it. This may result in a corresponding field error within the nested object graph or a global error if the current object is the top object.

Parameters:

field - the field name (may be null or empty String)

errorCode - error code, interpretable as a message key

defaultMessage - fallback default message

See Also:

getNestedPath()

rejectValue

void rejectValue(String field,
                 String errorCode,
                 Object[] errorArgs,
                 String defaultMessage)

Register a field error for the specified field of the current object (respecting the current nested path, if any), using the given error description.

The field name may be null or empty String to indicate the current object itself rather than a field of it. This may result in a corresponding field error within the nested object graph or a global error if the current object is the top object.

Parameters:

field - the field name (may be null or empty String)

errorCode - error code, interpretable as a message key

errorArgs - error arguments, for argument binding via MessageFormat (can be null)

defaultMessage - fallback default message

See Also:

getNestedPath()

addAllErrors

void addAllErrors(Errors errors)

Add all errors from the given Errors instance to this Errors instance.

This is a onvenience method to avoid repeated reject(..) calls for merging an Errors instance into another Errors instance.

Note that the passed-in Errors instance is supposed to refer to the same target object, or at least contain compatible errors that apply to the target object of this Errors instance.

Parameters:

errors - the Errors instance to merge in

hasErrors

boolean hasErrors()

Return if there were any errors.

getErrorCount

int getErrorCount()

Return the total number of errors.

getAllErrors

List getAllErrors()

Get all errors, both global and field ones.

Returns:

List of ObjectError instances

hasGlobalErrors

boolean hasGlobalErrors()

Are there any global errors?

Returns:

true if there are any global errors

getGlobalErrorCount

int getGlobalErrorCount()

Return the number of global errors.

Returns:

the number of global errors

getGlobalErrors

List getGlobalErrors()

Get all global errors.

Returns:

List of ObjectError instances

getGlobalError

ObjectError getGlobalError()

Get the first global error, if any.

Returns:

the global error, or null

hasFieldErrors

boolean hasFieldErrors(String field)

Are there any errors associated with the given field?

Parameters:

field - the field name

Returns:

true if there were any errors associated with the given field

getFieldErrorCount

int getFieldErrorCount(String field)

Return the number of errors associated with the given field.

Parameters:

field - the field name

Returns:

the number of errors associated with the given field

getFieldErrors

List getFieldErrors(String field)

Get all errors associated with the given field.

Implementations should support not only full field names like "name" but also pattern matches like "na*" or "address.*".

Parameters:

field - the field name

Returns:

a List of FieldError instances

getFieldError

FieldError getFieldError(String field)

Get the first error associated with the given field, if any.

Parameters:

field - the field name

Returns:

the field-specific error, or null

getFieldValue

Object getFieldValue(String field)

Return the current value of the given field, either the current bean property value or a rejected update from the last binding.

Allows for convenient access to user-specified field values, even if there were type mismatches.

Parameters:

field - the field name

Returns:

the current value of the given field