public class JavaExtensionLibrary extends java.lang.Object implements FunctionLibrary
Constructor and Description |
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JavaExtensionLibrary(Configuration config)
Construct a JavaExtensionLibrary and establish the default uri->class mappings.
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Modifier and Type | Method and Description |
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protected int |
atomicConversionPreference(int primitiveType,
java.lang.Class required)
Get the conversion preference from an XPath primitive atomic type to a Java class
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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.
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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.
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void |
declareJavaClass(java.lang.String uri,
java.lang.Class theClass)
Declare a mapping from a specific namespace URI to a Java class
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boolean |
isAvailable(StructuredQName functionName,
int arity)
Test whether an extension function with a given name and arity is available.
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protected void |
setDefaultURIMappings()
Define initial mappings of "well known" namespace URIs to Java classes (this covers
the Saxon and EXSLT extensions).
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void |
setStrictJavaUriFormat(boolean strict)
Indicate that only the strict "java:" URI format is to be recognized
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public JavaExtensionLibrary(Configuration config)
config
- The Saxon configurationprotected void setDefaultURIMappings()
public void setStrictJavaUriFormat(boolean strict)
strict
- true if only the strict format is recognizedpublic void declareJavaClass(java.lang.String uri, java.lang.Class theClass)
uri
- the namespace URI of the function nametheClass
- the Java class that implements the functions in this namespacepublic boolean isAvailable(StructuredQName functionName, int arity)
isAvailable
in interface FunctionLibrary
functionName
- The qualified name of the extension functionarity
- 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 somepublic Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env) throws XPathException
bind
in interface FunctionLibrary
functionName
- the qualified name of the function being calledstaticArgs
- 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 contextXPathException
- 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, java.lang.Class required)
primitiveType
- integer code identifying the XPath primitive type, for example
StandardNames.XS_STRING
or StandardNames.XS_STRING
required
- The Java Class named in the method signatureStringValue
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