MXmlEngXPathEvaluationContext Class Reference
| class MXmlEngXPathEvaluationContext |
Provides the XPath evaluation context interface. An object of this type provides the argument values to an extension function to be evalutated and stores the result of evalutation.
MXmlEngXPathExtensionFunction MXmlEngXPathExtensionFunction::Evaluate()Objects of this type are not registered with the XPath library and must be destroyed by their owner.
Any memory allocated by this object must be freed when the object is destroyed.
Member Functions Documentation
AppendToResult(const TXmlEngNode)
| void | AppendToResult | ( | const TXmlEngNode | aNode | ) | [pure virtual] |
Appends a node to the node set result. InitializeNodeSetResult() should be called prior to the first call to an AppendToResult() method.
This method will return and do nothing if a previous OOM condition in the underlying libxml2 library has not been cleared. See libxml2_modules.h.
- Pre-condition
- OOM_FLAG==0, otherwise method returns and does nothing.
AppendToResult(const TXmlEngNamespace, const TXmlEngElement)
Appends a namespace node to the node set result. InitializeNodeSetResult() should be called prior to the first call to an AppendToResult() method.
A namespace node is the representation of an existing namespace declaration within an element node. This function cannot be used to add a new namespace declaration, rather it adds an existing namespace declaration attached to aNsParentNode.
TXmlEngNamespaceThis method will return and do nothing if a previous OOM condition in the underlying libxml2 library has not been cleared. See libxml2_modules.h.
- Pre-condition
- OOM_FLAG==0, otherwise method returns and does nothing.
Parameters
| const TXmlEngNamespace aAppendedNsNode | A namspace node to add to the node set result. |
| const TXmlEngElement aNsParentNode | An element node that holds the namespace declaration represented by aAppendedNsNode. |
AppendToResult(const RXmlEngNodeSet)
Appends a node set to the node set result. Nodes are merged into a resulting node set. InitializeNodeSetResult() should be called prior to the first call to an AppendToResult() method.
This method will return and do nothing if a previous OOM condition in the underlying libxml2 library has not been cleared. See libxml2_modules.h.
- Pre-condition
- OOM_FLAG==0, otherwise method returns and does nothing.
ArgCount()
|
TUint
| ArgCount | ( | ) | [pure virtual] |
Gets the number of arguments provided.
Argument(TUint)
Gets an argument by index. Does not transfer ownership. Index starts at 0.
- Pre-condition
- 0 <= aIndex < ArgCount(). Function panics if precondition not met.
ExtendedContext()
| void * | ExtendedContext | ( | ) | [pure virtual] |
InitializeNodeSetResult()
| void | InitializeNodeSetResult | ( | ) | [pure virtual] |
SetResult(TReal)
| void | SetResult | ( | TReal | aNumber | ) | [pure virtual] |
Sets the type of result to floating point number and stores the number as the result.
Parameters
| TReal aNumber | The number to store as the result |
SetResult(TBool)
| void | SetResult | ( | TBool | aBoolean | ) | [pure virtual] |
Sets the type of result to boolean and stores the value as the result.
Parameters
| TBool aBoolean | The value to store as the result |
SetResultL(const TDesC8 &)
| void | SetResultL | ( | const TDesC8 & | aString | ) | [pure virtual] |
Sets the type of result to string and stores the string as the result.
Parameters
| const TDesC8 & aString | The string to store as the result |
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