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java.lang.Objectnet.sf.saxon.dotnet.DotNetExtensionLibrary
public class DotNetExtensionLibrary
The DotNetExtensionLibrary is a FunctionLibrary that binds XPath function calls to calls on .NET methods (or constructors, or properties). It performs a mapping from the namespace URI of the function to the .NET assembly and type (the mapping is partly table driven and partly algorithmic), and maps the local name of the function to the .NET method, constructor, or property within the class. If the .NET methods are polymorphic, then it tries to select the appropriate method based on the static types of the supplied arguments. Binding is done entirely at XPath compilation time.
Constructor Summary | |
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DotNetExtensionLibrary(Configuration config)
Construct a JavaExtensionLibrary and establish the default uri->class mappings. |
Method Summary | |
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protected int |
atomicConversionPreference(int primitiveType,
cli.System.Type required)
Get the conversion preference from an XPath primitive atomic type to a .NET type |
Expression |
bind(StructuredQName functionName,
Expression[] staticArgs,
StaticContext env)
Bind an extension function, given the URI and local parts of the function name, and the list of expressions supplied as arguments. |
FunctionLibrary |
copy()
This method creates a copy of a FunctionLibrary: if the original FunctionLibrary allows new functions to be added, then additions to this copy will not affect the original, or vice versa. |
void |
declareDotNetType(java.lang.String uri,
cli.System.Type theClass)
Declare a mapping from a specific namespace URI to a .NET class |
boolean |
isAvailable(StructuredQName functionName,
int arity)
Test whether an extension function with a given name and arity is available. |
protected void |
setDefaultURIMappings()
Define initial mappings of "well known" namespace URIs to .NET classes (this covers the Saxon and EXSLT extensions). |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public DotNetExtensionLibrary(Configuration config)
config
- The Saxon configurationMethod Detail |
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protected void setDefaultURIMappings()
public void declareDotNetType(java.lang.String uri, cli.System.Type theClass)
uri
- the namespace URI of the function nametheClass
- the .NET class that implements the functions in this namespacepublic boolean isAvailable(StructuredQName functionName, int arity)
isAvailable
in interface FunctionLibrary
functionName
- arity
- The number of arguments. This is set to -1 in the case of the single-argument
function-available() function; in this case the method should return true if there is some
public Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env) throws XPathException
bind
in interface FunctionLibrary
functionName
- the name of the functionstaticArgs
- the expressions supplied statically in the function call. The intention is
that the static type of the arguments (obtainable via getItemType() and getCardinality()) may
be used as part of the binding algorithm.env
- the static context of the function call
XPathException
- if a function is found with the required name and arity, but
the implementation of the function cannot be loaded or used; or if an error occurs
while searching for the function.protected int atomicConversionPreference(int primitiveType, cli.System.Type required)
primitiveType
- integer code identifying the XPath primitive type, for example
StandardNames.XS_STRING
or StandardNames.XS_STRING
required
- The .NET Class named in the method signature
StringValue
is 50, while
XPath String to String
is 51. The value -1 indicates that the conversion is not allowed.public FunctionLibrary copy()
copy
in interface FunctionLibrary
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