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java.lang.Object net.sf.saxon.query.ImportedFunctionLibrary
public class ImportedFunctionLibrary
This implementation of FunctionLibrary contains all the functions imported into a Query Module. It is implemented as a view of the "global" XQueryFunctionLibrary for the whole query, selecting only those functions that are in an imported namespace.
Constructor Summary | |
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ImportedFunctionLibrary(QueryModule importingModule,
XQueryFunctionLibrary baseLibrary)
Create an imported function library |
Method Summary | |
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void |
addImportedNamespace(String namespace)
Add an imported namespace |
Expression |
bind(StructuredQName functionName,
Expression[] staticArgs,
StaticContext env,
Container container)
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. |
XQueryFunction |
getDeclaration(StructuredQName functionName,
Expression[] staticArgs)
Get the function declaration corresponding to a given function name and arity |
SequenceType[] |
getFunctionSignature(StructuredQName functionName,
int arity)
Test whether a function with a given name and arity is available; if so, return its signature. |
void |
setImportingModule(QueryModule importingModule)
Set the module that imports this function libary |
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 ImportedFunctionLibrary(QueryModule importingModule, XQueryFunctionLibrary baseLibrary)
importingModule
- the module importing the librarybaseLibrary
- the function library of which this is a subset viewMethod Detail |
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public void addImportedNamespace(String namespace)
namespace
- the imported namespacepublic Expression bind(StructuredQName functionName, Expression[] staticArgs, StaticContext env, Container container) throws XPathException
bind
in interface FunctionLibrary
functionName
- the name of the function to be boundstaticArgs
- The expressions supplied statically in arguments to the function call.
The length of this array represents the arity of the function. The intention is
that the static type of the arguments (obtainable via getItemType() and getCardinality()) may
be used as part of the binding algorithm. In some cases it may be possible for the function
to be pre-evaluated at compile time, for example if these expressions are all constant values.
The conventions of the XPath language demand that the results of a function depend only on the
values of the expressions supplied as arguments, and not on the form of those expressions. For
example, the result of f(4) is expected to be the same as f(2+2). The actual expression is supplied
here to enable the binding mechanism to select the most efficient possible implementation (including
compile-time pre-evaluation where appropriate).env
- container
-
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.public XQueryFunction getDeclaration(StructuredQName functionName, Expression[] staticArgs)
getDeclaration
in interface XQueryFunctionBinder
functionName
- the name of the function as a QNamestaticArgs
- the expressions supplied as arguments in the function call (typically,
we only need to know the number of arguments)
public FunctionLibrary copy()
copy
in interface FunctionLibrary
public void setImportingModule(QueryModule importingModule)
importingModule
- the importing modulepublic SequenceType[] getFunctionSignature(StructuredQName functionName, int arity)
This method may be called either at compile time or at run time. If the function library is to be used only in an XQuery or free-standing XPath environment, this method may throw an UnsupportedOperationException.
getFunctionSignature
in interface FunctionLibrary
functionName
- the qualified name of the function being calledarity
- 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
function of this name available for calling.
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