java.lang.Object | |
↳ | javax.xml.validation.Validator |
A processor that checks an XML document against
Schema
.
A validator is a thread-unsafe and non-reentrant object.
In other words, it is the application's responsibility to make
sure that one
Validator
object is not used from
more than one thread at any given time, and while the
validate
method is invoked, applications may not recursively call
the
validate
method.
Note that while the
validate(javax.xml.transform.Source)
and
validate(javax.xml.transform.Source, javax.xml.transform.Result)
methods take a
Source
instance, the
Source
instance must be a
SAXSource
,
DOMSource
,
StAXSource
or
StreamSource
.
Protected Constructors | |||||||||||
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Constructor for derived classes.
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Public Methods | |||||||||||
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Gets the current
ErrorHandler
set to this
Validator
.
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Look up the value of a feature flag.
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Look up the value of a property.
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Gets the current
LSResourceResolver
set to this
Validator
.
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Reset this
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Sets the
ErrorHandler
to receive errors encountered
during the
validate
method invocation.
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Set the value of a feature flag.
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Set the value of a property.
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Sets the
LSResourceResolver
to customize
resource resolution while in a validation episode.
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Validates the specified input and send the augmented validation
result to the specified output.
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Validates the specified input.
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[Expand]
Inherited Methods
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From class
java.lang.Object
|
Constructor for derived classes.
The constructor does nothing.
Derived classes must create
Validator
objects that have
null
ErrorHandler
and
null
LSResourceResolver
.
Gets the current
ErrorHandler
set to this
Validator
.
setErrorHandler(ErrorHandler)
method, or null
if that method has never been called since this
Validator
has created.
Look up the value of a feature flag.
The feature name is any fully-qualified URI. It is
possible for a
Validator
to recognize a feature name but
temporarily be unable to return its value.
Some feature values may be available only in specific
contexts, such as before, during, or after a validation.
Implementors are free (and encouraged) to invent their own features, using names built on their own URIs.
name | The feature name, which is a non-null fully-qualified URI. |
---|
SAXNotRecognizedException | If the feature value can't be assigned or retrieved. |
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SAXNotSupportedException |
When the
Validator
recognizes the feature name but
cannot determine its value at this time.
|
NullPointerException | When the name parameter is null. |
Look up the value of a property.
The property name is any fully-qualified URI. It is
possible for a
Validator
to recognize a property name but
temporarily be unable to return its value.
Some property values may be available only in specific
contexts, such as before, during, or after a validation.
Validator
s are not required to recognize any specific
property names.
Implementors are free (and encouraged) to invent their own properties, using names built on their own URIs.
name | The property name, which is a non-null fully-qualified URI. |
---|
SAXNotRecognizedException | If the property value can't be assigned or retrieved. |
---|---|
SAXNotSupportedException | When the XMLReader recognizes the property name but cannot determine its value at this time. |
NullPointerException | When the name parameter is null. |
Gets the current
LSResourceResolver
set to this
Validator
.
setResourceResolver(LSResourceResolver)
method, or null
if that method has never been called since this
Validator
has created.
Reset this
Validator
to its original configuration.
Validator
is reset to the same state as when it was created with
newValidator()
.
reset()
is designed to allow the reuse of existing
Validator
s
thus saving resources associated with the creation of new
Validator
s.
The reset
Validator
is not guaranteed to have the same
LSResourceResolver
or
ErrorHandler
Object
s, e.g.
equals(Object)
. It is guaranteed to have a functionally equal
LSResourceResolver
and
ErrorHandler
.
Sets the
ErrorHandler
to receive errors encountered
during the
validate
method invocation.
Error handler can be used to customize the error handling process
during a validation. When an
ErrorHandler
is set,
errors found during the validation will be first sent
to the
ErrorHandler
.
The error handler can abort further validation immediately
by throwing
SAXException
from the handler. Or for example
it can print an error to the screen and try to continue the
validation by returning normally from the
ErrorHandler
If any
Throwable
is thrown from an
ErrorHandler
,
the caller of the
validate
method will be thrown
the same
Throwable
object.
Validator
is not allowed to
throw
SAXException
without first reporting it to
ErrorHandler
.
When the
ErrorHandler
is null, the implementation will
behave as if the following
ErrorHandler
is set:
class DraconianErrorHandler implementsErrorHandler
{ public void fatalError(SAXParseException
e ) throwsSAXException
{ throw e; } public void error(SAXParseException
e ) throwsSAXException
{ throw e; } public void warning(SAXParseException
e ) throwsSAXException
{ // noop } }
When a new
Validator
object is created, initially
this field is set to null.
errorHandler | A new error handler to be set. This parameter can be null. |
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Set the value of a feature flag.
Feature can be used to control the way a
Validator
parses schemas, although
Validator
s are not required
to recognize any specific property names.
The feature name is any fully-qualified URI. It is
possible for a
Validator
to expose a feature value but
to be unable to change the current value.
Some feature values may be immutable or mutable only
in specific contexts, such as before, during, or after
a validation.
name | The feature name, which is a non-null fully-qualified URI. |
---|---|
value | The requested value of the feature (true or false). |
SAXNotRecognizedException | If the feature value can't be assigned or retrieved. |
---|---|
SAXNotSupportedException |
When the
Validator
recognizes the feature name but
cannot set the requested value.
|
NullPointerException | When the name parameter is null. |
Set the value of a property.
The property name is any fully-qualified URI. It is
possible for a
Validator
to recognize a property name but
to be unable to change the current value.
Some property values may be immutable or mutable only
in specific contexts, such as before, during, or after
a validation.
Validator
s are not required to recognize setting
any specific property names.
name | The property name, which is a non-null fully-qualified URI. |
---|---|
object | The requested value for the property. |
SAXNotRecognizedException | If the property value can't be assigned or retrieved. |
---|---|
SAXNotSupportedException |
When the
Validator
recognizes the property name but
cannot set the requested value.
|
NullPointerException | When the name parameter is null. |
Sets the
LSResourceResolver
to customize
resource resolution while in a validation episode.
Validator
uses a
LSResourceResolver
when it needs to locate external resources while a validation,
although exactly what constitutes "locating external resources" is
up to each schema language.
When the
LSResourceResolver
is null, the implementation will
behave as if the following
LSResourceResolver
is set:
class DumbLSResourceResolver implementsLSResourceResolver
{ publicLSInput
resolveResource( String publicId, String systemId, String baseURI) { return null; // always return null } }
If a
LSResourceResolver
throws a
RuntimeException
(or instances of its derived classes),
then the
Validator
will abort the parsing and
the caller of the
validate
method will receive
the same
RuntimeException
.
When a new
Validator
object is created, initially
this field is set to null.
resourceResolver | A new resource resolver to be set. This parameter can be null. |
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Validates the specified input and send the augmented validation result to the specified output.
This method places the following restrictions on the types of
the
Source
/
Result
accepted.
Source
/
Result
accepted:
SAXSource
|
DOMSource
|
StreamSource
|
||
null | OK | OK | OK | OK |
SAXResult
|
OK | Err | Err | Err |
DOMResult
|
Err | OK | Err | Err |
StreamResult
|
Err | Err | Err | OK |
To validate one
Source
into another kind of
Result
, use the identity transformer
(see
newTransformer()
).
Errors found during the validation is sent to the specified
ErrorHandler
.
If a document is valid, or if a document contains some errors
but none of them were fatal and the
ErrorHandler
didn't
throw any exception, then the method returns normally.
source | XML to be validated. Must not be null. |
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result |
The
Result
object that receives (possibly augmented)
XML. This parameter can be null if the caller is not interested
in it.
Note that when a
DOMResult
is used,
a validator might just pass the same DOM node from
DOMSource
to
DOMResult
(in which case
source.getNode()==result.getNode()
),
it might copy the entire DOM tree, or it might alter the
node given by the source.
|
IllegalArgumentException |
If the
Result
type doesn't match the
Source
type,
or if the specified source is not a
SAXSource
,
DOMSource
or
StreamSource
.
|
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SAXException |
If the
ErrorHandler
throws a
SAXException
or
if a fatal error is found and the
ErrorHandler
returns
normally.
|
IOException |
If the validator is processing a
SAXSource
and the
underlying
XMLReader
throws an
IOException
.
|
NullPointerException | If the source parameter is null. |
Validates the specified input.
This is just a convenience method of:
validate(source,null);
SAXException | |
---|---|
IOException |