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


java.lang.Object
   net.sf.saxon.expr.ComputedExpression
      net.sf.saxon.expr.FunctionCall
         net.sf.saxon.functions.ExtensionFunctionCall

ExtensionFunctionCall
public class ExtensionFunctionCall extends FunctionCall (Code)
This class acts as a container for an extension function defined to call a method in a user-defined class.

Note that the binding of an XPath function call to a Java method is done in class JavaExtensionLibrary




Constructor Summary
public  ExtensionFunctionCall()
    

Method Summary
public  voidcheckArguments(StaticContext env)
    
public  intcomputeCardinality()
    
protected  ObjectgetField(Field field, Object instance)
     Access a field.
public  intgetIntrinsicDependencies()
     Determine which aspects of the context the expression depends on.
public  ItemTypegetItemType(TypeHierarchy th)
     Determine the data type of the expression, if possible.
public  ClassgetTargetClass()
    
public  AccessibleObjectgetTargetMethod()
    
public  voidinit(int nameCode, Class theClass, AccessibleObject object, Configuration config)
    
protected  ObjectinvokeConstructor(Constructor constructor, Object[] params)
     Invoke a constructor.
protected  ObjectinvokeMethod(Method method, Object instance, Object[] params)
     Invoke a method.
public  SequenceIteratoriterate(XPathContext context)
     Evaluate the function.
public  ExpressionpreEvaluate(StaticContext env)
    
public  booleanusesFocus()
     Determine whether this method uses the focus.


Constructor Detail
ExtensionFunctionCall
public ExtensionFunctionCall()(Code)
Default constructor




Method Detail
checkArguments
public void checkArguments(StaticContext env) throws XPathException(Code)
Method called by the expression parser when all arguments have been supplied



computeCardinality
public int computeCardinality()(Code)



getField
protected Object getField(Field field, Object instance) throws java.lang.IllegalAccessException(Code)
Access a field. This method is provided separately so that it can be refined in a subclass. For example, a subclass might perform tracing of calls, or might trap exceptions.
Parameters:
  field - The field to be retrieved
Parameters:
  instance - The object whose field is to be retrieved. This is set to null if thefield is static. The value of the field
throws:
  IllegalAccessException - if the invocation throws an IllegalAccessException



getIntrinsicDependencies
public int getIntrinsicDependencies()(Code)
Determine which aspects of the context the expression depends on. The result is a bitwise-or'ed value composed from constants such as XPathContext.VARIABLES and XPathContext.CURRENT_NODE



getItemType
public ItemType getItemType(TypeHierarchy th)(Code)
Determine the data type of the expression, if possible. All expressions return sequences, in general; this method determines the type of the items within the sequence, assuming that (a) this is known in advance, and (b) it is the same for all items in the sequence.

This method will always return a result, though it may be the best approximation that is available at the time.

the item type
Parameters:
  th -



getTargetClass
public Class getTargetClass()(Code)
Get the class containing the method being called



getTargetMethod
public AccessibleObject getTargetMethod()(Code)
Get the target method (or field, or constructor) being called



init
public void init(int nameCode, Class theClass, AccessibleObject object, Configuration config)(Code)
Initialization: creates an ExtensionFunctionCall
Parameters:
  nameCode - the name code of the function, for display purposes
Parameters:
  theClass - the Java class containing the method to be called
Parameters:
  object - the method, field, or constructor of the Java class to be called



invokeConstructor
protected Object invokeConstructor(Constructor constructor, Object[] params) throws java.lang.InstantiationException, java.lang.IllegalAccessException, java.lang.reflect.InvocationTargetException(Code)
Invoke a constructor. This method is provided separately so that it can be refined in a subclass. For example, a subclass might perform tracing of calls, or might trap exceptions.
Parameters:
  constructor - The constructor to be invoked
Parameters:
  params - The parameters to be passed to the constructor The object returned by the constructor
throws:
  InstantiationException - if the invocation throws an InstantiationException
throws:
  IllegalAccessException - if the invocation throws an IllegalAccessException
throws:
  InvocationTargetException - if the invocation throws an InvocationTargetException (which happenswhen the constructor itself throws an exception)



invokeMethod
protected Object invokeMethod(Method method, Object instance, Object[] params) throws java.lang.IllegalAccessException, java.lang.reflect.InvocationTargetException(Code)
Invoke a method. This method is provided separately so that it can be refined in a subclass. For example, a subclass might perform tracing of calls, or might trap exceptions.
Parameters:
  method - The method to be invoked
Parameters:
  instance - The object on which the method is to be invoked. This is set to null if themethod is static.
Parameters:
  params - The parameters to be passed to the method The object returned by the method
throws:
  IllegalAccessException - if the invocation throws an IllegalAccessException
throws:
  InvocationTargetException - if the invocation throws an InvocationTargetException (which happenswhen the method itself throws an exception)



iterate
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)
Evaluate the function.

Parameters:
  context - The context in which the function is to be evaluated a Value representing the result of the function.
throws:
  net.sf.saxon.trans.XPathException - if the function cannot be evaluated.



preEvaluate
public Expression preEvaluate(StaticContext env)(Code)
preEvaluate: this method suppresses compile-time evaluation by doing nothing (because the external function might have side-effects and might use the context)



usesFocus
public boolean usesFocus()(Code)
Determine whether this method uses the focus. True if the first argument is of type XPathContext.



Fields inherited from net.sf.saxon.expr.FunctionCall
protected Expression[] argument(Code)(Java Doc)

Methods inherited from net.sf.saxon.expr.FunctionCall
protected int checkArgumentCount(int min, int max, StaticContext env) throws XPathException(Code)(Java Doc)
abstract protected void checkArguments(StaticContext env) throws XPathException(Code)(Java Doc)
public void display(int level, NamePool pool, PrintStream out)(Code)(Java Doc)
final public String getDisplayName(NamePool pool)(Code)(Java Doc)
final public int getFunctionNameCode()(Code)(Java Doc)
final public int getNumberOfArguments()(Code)(Java Doc)
public Iterator iterateSubExpressions()(Code)(Java Doc)
public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException(Code)(Java Doc)
public Expression preEvaluate(StaticContext env) throws XPathException(Code)(Java Doc)
public Expression promote(PromotionOffer offer) throws XPathException(Code)(Java Doc)
public void setArguments(Expression[] args)(Code)(Java Doc)
final public void setFunctionNameCode(int nc)(Code)(Java Doc)
public Expression simplify(StaticContext env) throws XPathException(Code)(Java Doc)
final protected Expression simplifyArguments(StaticContext env) throws XPathException(Code)(Java Doc)
public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException(Code)(Java Doc)

Fields inherited from net.sf.saxon.expr.ComputedExpression
protected int locationId(Code)(Java Doc)
protected int staticProperties(Code)(Java Doc)

Methods inherited from net.sf.saxon.expr.ComputedExpression
public void adoptChildExpression(Expression child)(Code)(Java Doc)
public void checkPermittedContents(SchemaType parentType, StaticContext env, boolean whole) throws XPathException(Code)(Java Doc)
abstract protected int computeCardinality()(Code)(Java Doc)
public int computeDependencies()(Code)(Java Doc)
public int computeSpecialProperties()(Code)(Java Doc)
final public void computeStaticProperties()(Code)(Java Doc)
final public Expression doPromotion(Expression subexpression, PromotionOffer offer) throws XPathException(Code)(Java Doc)
protected void dynamicError(String message, XPathContext context) throws DynamicError(Code)(Java Doc)
protected void dynamicError(String message, String code, XPathContext context) throws DynamicError(Code)(Java Doc)
public boolean effectiveBooleanValue(XPathContext context) throws XPathException(Code)(Java Doc)
public String evaluateAsString(XPathContext context) throws XPathException(Code)(Java Doc)
public Item evaluateItem(XPathContext context) throws XPathException(Code)(Java Doc)
public int getCardinality()(Code)(Java Doc)
public int getColumnNumber()(Code)(Java Doc)
protected int getConstructType()(Code)(Java Doc)
public int getDependencies()(Code)(Java Doc)
public Executable getExecutable()(Code)(Java Doc)
public int getImplementationMethod()(Code)(Java Doc)
public InstructionInfo getInstructionInfo()(Code)(Java Doc)
public int getIntrinsicDependencies()(Code)(Java Doc)
public int getLineNumber()(Code)(Java Doc)
final public int getLocationId()(Code)(Java Doc)
public LocationProvider getLocationProvider()(Code)(Java Doc)
public Container getParentExpression()(Code)(Java Doc)
final public String getPublicId()(Code)(Java Doc)
public int[] getSlotsUsed()(Code)(Java Doc)
final public int getSpecialProperties()(Code)(Java Doc)
public String getSystemId()(Code)(Java Doc)
public boolean hasBadParentPointer()(Code)(Java Doc)
public SequenceIterator iterate(XPathContext context) throws XPathException(Code)(Java Doc)
public Iterator iterateSubExpressions()(Code)(Java Doc)
public boolean markTailFunctionCalls()(Code)(Java Doc)
public void process(XPathContext context) throws XPathException(Code)(Java Doc)
public Expression promote(PromotionOffer offer) throws XPathException(Code)(Java Doc)
final public void resetStaticProperties()(Code)(Java Doc)
public void setLocationId(int id)(Code)(Java Doc)
public void setParentExpression(Container parent)(Code)(Java Doc)
public Expression simplify(StaticContext env) throws XPathException(Code)(Java Doc)
public void suppressValidation(int validationMode)(Code)(Java Doc)
protected void typeError(String message, XPathContext context) throws DynamicError(Code)(Java Doc)
protected void typeError(String message, String errorCode, XPathContext context) throws DynamicError(Code)(Java Doc)

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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