Hi all,
I am trying to enhance the Xerces XML Schema 1.1 assertions
implementation as per the latest suggestions from Khaled on the JIRA
issue, XERCESJ-1365.
While making some enhancements, I have bumped into a little problem,
for which I need help..
Below is the description of the problem, my analysis why Xerces gives
an exception (a NPE as stated below), and my questions..
I have got an element declaration as following:
<xs:element name="phonebill">
<xs:complexType>
<xs:sequence>
<xs:element name="plan" type="xs:string" />
<xs:element name="rent" type="xs:integer" />
</xs:sequence>
<xs:attribute name="custId" type="xs:string" />
<xs:assert test="starts-with(@custId, 'XYZTelecom')" />
<xs:assert test="(plan = 'A' and rent = 500) or
(plan = 'B' and rent = 650) or
(plan = 'C' and rent = 1000)" />
</xs:complexType>
</xs:element>
You could see, that the complex type of the element, "phonebill" is anonymous.
After debugging the execution, I could see, that
Xerces generates internally the name, "#AnonType_phonebill" for this
anonymous complex type.
I am trying to create a local XSModel object for an element's content
model (not of the full schema, but am trying to build the XSModel for
this single element - phonebill in this case).
for this, I have written a code like below:
SchemaGrammar schemaGrammar = new SchemaGrammar(null, null, null,
Constants.SCHEMA_VERSION_1_1);
schemaGrammar.addGlobalElementDecl((XSElementDecl)elementPSVI.getElementDeclaration());
schemaGrammar.addGlobalTypeDecl(elementPSVI.getTypeDefinition()); //
[1] a java.lang.NullPointerException comes here
XSNotationDeclaration notationDecl = elementPSVI.getNotation();
if (notationDecl != null) {
schemaGrammar.addGlobalNotationDecl((XSNotationDecl) notationDecl);
}
XSModel xsModel = new XSModelImpl(new SchemaGrammar[] { schemaGrammar
}); // this is the object, that I need to create
(elementPSVI is of type ElementPSVI and is populated correctly, which
is passed from the class XMLSchemaValidator.java)
When I run this code, I get a null pointer exception at location [1]
stated above.
When I further debugged the code, I could find following cause of the
null pointer exception:
null pointer exception is produced by the call,
schemaGrammar.addGlobalTypeDecl as stated above. When I look the
implementation of method, addGlobalTypeDecl in SchemaGrammar.java, I
can see that NPE is coming in the function call:
fGlobalTypeDecls.put(decl.getName(), decl);
decl.getName() in this case is null (because, we have an anonymous
type). The implementation of decl.getName() is as following:
public String getName() {
return getAnonymous() ? null : fName;
}
(you could see, that null is returned if the type is an anonymous type)
decl.getName() being null, the call fGlobalTypeDecls.put fails
put is being implemented as follows:
public void put(Object key, Object value) {
int bucket = (key.hashCode() & 0x7FFFFFFF) % fTableSize;
since the 'key' is null, we get a NPE (I think at the call, key.hashCode).
I need help to understand this behaviour, and want to create the
SchemaGrammar above (without NPE..)
I can think of following options:
1. I cannot do,
schemaGrammar.addGlobalTypeDecl(elementPSVI.getTypeDefinition());
if the type is an anonymous type.
It seem, *I need to do this* to have a fully populated schema.
2. To solve this issue, the implementation of getName() above could have been:
public String getName() {
return fName;
}
So the getName call would have returned "#AnonType_phonebill" in this case.
Is the change 2. feasible to be implemented in Xerces? Does it affect
other places of Xerces code?
I have following questions:
1) Am I building the SchemaGrammar correctly? If not, what's the correct way?
2) If yes, then how do I avoid NPE in this case?
--
Regards,
Mukul Gandhi
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