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Java Source Code / Java Documentation » XML » saxonb » net.sf.saxon.query 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sf.saxon.query.ImportedFunctionLibrary

ImportedFunctionLibrary
public class ImportedFunctionLibrary implements FunctionLibrary,XQueryFunctionBinder(Code)
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.


Field Summary
 XQueryFunctionLibrarybaseLibrary
    
 HashSetnamespaces
    

Constructor Summary
public  ImportedFunctionLibrary(XQueryFunctionLibrary baseLibrary)
    

Method Summary
public  voidaddImportedNamespace(String namespace)
    
public  Expressionbind(int nameCode, String uri, String local, Expression[] staticArgs)
     Bind an extension function, given the URI and local parts of the function name, and the list of expressions supplied as arguments.
public  FunctionLibrarycopy()
     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. a copy of this function library.
public  XQueryFunctiongetDeclaration(int nameCode, String uri, String local, Expression[] staticArgs)
    
public  booleanisAvailable(int fingerprint, String uri, String local, int arity)
     Test whether an extension function with a given name and arity is available.

Field Detail
baseLibrary
XQueryFunctionLibrary baseLibrary(Code)



namespaces
HashSet namespaces(Code)




Constructor Detail
ImportedFunctionLibrary
public ImportedFunctionLibrary(XQueryFunctionLibrary baseLibrary)(Code)




Method Detail
addImportedNamespace
public void addImportedNamespace(String namespace)(Code)



bind
public Expression bind(int nameCode, String uri, String local, Expression[] staticArgs) throws XPathException(Code)
Bind an extension function, given the URI and local parts of the function name, and the list of expressions supplied as arguments. This method is called at compile time.
Parameters:
  nameCode - The namepool nameCode of the function name. The uri and local name are alsosupplied (redundantly) to avoid fetching them from the name pool.
Parameters:
  uri - The URI of the function name
Parameters:
  local - The local part of the function name
Parameters:
  staticArgs - The expressions supplied statically in arguments to the function call.The length of this array represents the arity of the function. The intention isthat the static type of the arguments (obtainable via getItemType() and getCardinality()) maybe used as part of the binding algorithm. In some cases it may be possible for the functionto 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 thevalues of the expressions supplied as arguments, and not on the form of those expressions. Forexample, the result of f(4) is expected to be the same as f(2+2). The actual expression is suppliedhere to enable the binding mechanism to select the most efficient possible implementation (includingcompile-time pre-evaluation where appropriate). An object representing the function to be called, if one is found;null if no function was found matching the required name and arity.
throws:
  net.sf.saxon.trans.XPathException - if a function is found with the required name and arity, butthe implementation of the function cannot be loaded or used; or if an error occurswhile searching for the function.




copy
public FunctionLibrary copy()(Code)
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. a copy of this function library. This must be an instance of the original class.



getDeclaration
public XQueryFunction getDeclaration(int nameCode, String uri, String local, Expression[] staticArgs)(Code)
Get the function declaration corresponding to a given function name and arity the XQueryFunction if there is one, or null if not.



isAvailable
public boolean isAvailable(int fingerprint, String uri, String local, int arity)(Code)
Test whether an extension function with a given name and arity is available. This supports the function-available() function in XSLT. 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.
Parameters:
  fingerprint - The namepool fingerprint of the function name. This must match theuri and localName; the information is provided redundantly to avoid repeated lookups in the name pool.
Parameters:
  uri - The URI of the function name
Parameters:
  local - The local part of the function name
Parameters:
  arity - The number of arguments. This is set to -1 in the case of the single-argumentfunction-available() function; in this case the method should return true if there is somematching extension function, regardless of its arity.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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