oracle.xml.parser.schema
Class XSDValidator

java.lang.Object
  |
  +--oracle.xml.parser.v2.XMLMultiHandler
        |
        +--oracle.xml.parser.schema.XSDValidator

All Implemented Interfaces:

ContentHandler, XSDConstantValues

public class XSDValidator

extends XMLMultiHandler

implements XSDConstantValues

XSDValidator validates instance XML document against an XMLSchema. When registered an XSDValidator object is inserted as a pipe-line node between XMLParser and XMLDocument events handler (SAXHandler or DOMBuilder). It works with three events: startElement, characters and endElement. If defined, default element and default attribute values are added to the events contents (as XMLSchema additions to infoset) and are propagated up. As far as XSDValidator is concerned the XMLSchema object is a set/group of element declaratioms whith following structure: [element(name)] -> [shode(min/maxOccurs)] -> [type(group/simpleType)] XSDValidator is implemented as stack based state machine. Each state represents element type - group or simpleType. XMLSchema object(as a group) is loaded as a first state. Current element(event startElement) is matched against current state group elements. If matched the element type element name and snode info are loaded as new state. In a case of group a vector of counters(int) is allocated in a parallel stack. This vector is used to count element occurances. State status could be: - NEW_STATE: just loaded and not tryed. - ACCEPTED: minOccurs satisfied. Could still accept element occurances. - DONE: maxOccurs satisfied. Doesn't accept element occurances. Text element contents(event characters) is matched against simpleType (method validateValue). End element (event endElement) is matched against last named state. XMLSchema attributes are represented as a group (attrName -> attrType) forming the contents of special element: <_attrTag> <attrName> attrType </attrName> ... </_attrTag> SMLParser converts attributes (event startElement) accordingly. (see method startElement) XSDAny objects are used as Namespace frame descriptors (see XMLSchema definition of 'any' element). Fake states are loaded in a case of error or when wildcard('any') contents is skipped.

XSDValidator

public XSDValidator()
             throws XSDException

XSDValidator constructor.

reset

public void reset()

Reset the validator, prepare for next validation

setError

public void setError(XMLError he)
              throws SAXException

Sets an XMLError object as current err.

Parameters:

he - XMLError object

Throws:

SAXException - A SAXException could be thrown.

setXMLSchema

public void setXMLSchema(XMLSchema s)
                  throws SAXException

Deprecated.  

Sets an XMLSchema object as current schema.

Parameters:

s - XMLSchema object

Throws:

SAXException - A SAXException could be thrown.

setXMLProperty

public java.lang.Object setXMLProperty(java.lang.String name,
                                       java.lang.Object value)

Set a property. The value of the property set is returned if successfully set, a null is returned if the property is read-only and cannot be set or is not supported.

Parameters:

name - - name of the property

value - - value of the property

Returns:

Object - the set property

getCurrentMode

public java.lang.String getCurrentMode()

Get the current validation mode

Returns:

a _strict, _lax, _skip, or _error

getTypeDefinition

public XSDNode getTypeDefinition()

Get the current XSD type

Returns:

XSDComplexType node or XSDSimpleType<code/> node

getElementDeclaration

public XSDElement getElementDeclaration()

Get the current element declaration

Returns:

XSDElement node

startElement

public void startElement(java.lang.String namespaceURI,
                         java.lang.String localName,
                         java.lang.String qName,
Attributes atts)
                  throws SAXException

Receive notification of the beginning of an element.

Specified by:

startElement in interface ContentHandler

Overrides:

startElement in class XMLMultiHandler

Parameters:

localName - The local name(without prefix), or the empty string if Namespace processing is not being performed.

qName - The qualified name (with prefix), or the empty string if qualified names are not available.

atts - The attributes attached to the element. If there are no attributes, it shall be an empty Attributes object.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

endElement(java.lang.String, java.lang.String, java.lang.String), Attributes

endElement

public void endElement(java.lang.String namespaceURI,
                       java.lang.String localName,
                       java.lang.String qName)
                throws SAXException

Receive notification of the end of an element.

Specified by:

endElement in interface ContentHandler

Overrides:

endElement in class XMLMultiHandler

Parameters:

localName - The local name (without prefix), or the empty string if Namespace processing is not being performed.

qName - The qualified XML 1.0 name (with prefix), or the empty string if qualified names are not available.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

characters

public void characters(char[] ch,
                       int start,
                       int length)
                throws SAXException

Propagate notification of character data inside an element.

Specified by:

characters in interface ContentHandler

Overrides:

characters in class XMLMultiHandler

Parameters:

ch - The characters.

start - The start position in the character array.

length - The number of characters to use from the character array.

Throws:

SAXException - Any SAX exception, possibly wrapping another exception.

See Also:

DocumentHandler.characters(char[], int, int)

setDocumentLocator

public void setDocumentLocator(Locator locator)

Propagates Locator object for document events.

Specified by:

setDocumentLocator in interface ContentHandler

Overrides:

setDocumentLocator in class XMLMultiHandler

Parameters:

locator - A locator for all SAX document events.

See Also:

DocumentHandler.setDocumentLocator(org.xml.sax.Locator), Locator