Java Reference
In-Depth Information
public
attribute value (the null reference when this value is not available),
and
systemId
provides this declaration's
system
attribute value.
•
void unparsedEntityDecl(String name, String publicId,
String systemId, String notationName)
reportsanexternalun-
parsed entity declaration, where
name
provides the value of this declaration's
name
attribute,
publicId
provides the value of the
public
attribute (the
nullreferencewhenthisvalueisnotavailable),
systemId
providesthevalue
of the
system
attribute, and
notationName
provides the
NDATA
name.
Each method is declared to throw
SAXException
, which an overriding callback
method might choose to throw when it detects a problem.
EntityResolver
declares the following callback method:
•
InputSource resolveEntity(String publicId, String
systemId)
is called to let the application resolve an external entity (such
as an external DTD subset) by returning a custom
InputSource
instance
that'sbasedonadifferentURI.Thismethodisdeclaredtothrow
SAXExcep-
tion
when it detects a SAX-oriented problem, and is also declared to throw
IOException
whenitencountersanI/Oerror,possiblyinresponsetocreat-
ingan
InputStream
instanceora
java.io.Reader
instanceforthe
In-
putSource
being created.
ErrorHandler
declaresthefollowingerror-orientedinformationalcallbackmeth-
ods:
•
void error(SAXParseException exception)
reportsthatarecov-
erableparsererror(typicallythedocumentisnotvalid)hasoccurred;thedetails
arespecifiedviatheargumentpassedto
exception
.Thismethodistypically
overriddentoreporttheerrorviaacommandwindow(see
Chapter1
)ortolog
it to a file or a database.
•
void fatalError(SAXParseException exception)
reports that
anunrecoverableparsererror(thedocumentisnotwellformed)hasoccurred;
thedetailsarespecifiedviatheargumentpassedto
exception
.Thismethod
is typically overridden so that the application can log the error before it stops
processing the document (because the document is no longer reliable).
•
void warning(SAXParseException e)
reportsthatanonerror(e.g.,
an element name begins with the reserved
xml
character sequence) has oc-
curred;thedetailsarespecifiedviatheargumentpassedto
exception
.This
