| java.lang.Object
 net.sf.saxon.expr.ComputedExpression
net.sf.saxon.expr.FunctionCall
All known Subclasses: net.sf.saxon.xpath.XPathFunctionCall, net.sf.saxon.functions.ExtensionFunctionCall, net.sf.saxon.expr.UserFunctionCall, net.sf.saxon.functions.SystemFunction,
| FunctionCall | | abstract public class FunctionCall extends ComputedExpression (Code) | | Abstract superclass for calls to system-defined and user-defined functions
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| argument | | protected Expression[] argument(Code) | | The array of expressions representing the actual parameters
to the function call
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| checkArgumentCount | | protected int checkArgumentCount(int min, int max, StaticContext env) throws XPathException(Code) | | Check number of arguments.
A convenience routine for use in subclasses.
Parameters:
min - the minimum number of arguments allowed
Parameters:
max - the maximum number of arguments allowed the actual number of arguments
throws:
net.sf.saxon.trans.XPathException - if the number of arguments is out of range |
| checkArguments | | abstract protected void checkArguments(StaticContext env) throws XPathException(Code) | | Method supplied by each class of function to check arguments during parsing, when all
the argument expressions have been read
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| getDisplayName | | final public String getDisplayName(NamePool pool)(Code) | | Diagnostic print of expression structure
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| getFunctionNameCode | | final public int getFunctionNameCode()(Code) | | Get the name code of the function being called
the name code as recorded in the name pool |
| getNumberOfArguments | | final public int getNumberOfArguments()(Code) | | Determine the number of actual arguments supplied in the function call
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| iterateSubExpressions | | public Iterator iterateSubExpressions()(Code) | | Get the immediate subexpressions of this expression
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| optimize | | public Expression optimize(Optimizer opt, StaticContext env, ItemType contextItemType) throws XPathException(Code) | | Perform optimisation of an expression and its subexpressions.
This method is called after all references to functions and variables have been resolved
to the declaration of the function or variable, and after all type checking has been done.
Parameters:
opt - the optimizer in use. This provides access to supporting functions; it also allowsdifferent optimization strategies to be used in different circumstances.
Parameters:
env - the static context of the expression
Parameters:
contextItemType - the static type of "." at the point where this expression is invoked.The parameter is set to null if it is known statically that the context item will be undefined.If the type of the context item is not known statically, the argument is set tonet.sf.saxon.type.Type.ITEM_TYPE the original expression, rewritten if appropriate to optimize execution
throws:
net.sf.saxon.trans.StaticError - if an error is discovered during this phase(typically a type error) |
| preEvaluate | | public Expression preEvaluate(StaticContext env) throws XPathException(Code) | | Pre-evaluate a function at compile time. Functions that do not allow
pre-evaluation, or that need access to context information, can override this method.
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| setArguments | | public void setArguments(Expression[] args)(Code) | | Method called by the expression parser when all arguments have been supplied
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| setFunctionNameCode | | final public void setFunctionNameCode(int nc)(Code) | | Set the name code of the function being called
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| simplify | | public Expression simplify(StaticContext env) throws XPathException(Code) | | Simplify the function call. Default method is to simplify each of the supplied arguments and
evaluate the function if all are now known.
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| simplifyArguments | | final protected Expression simplifyArguments(StaticContext env) throws XPathException(Code) | | Simplify the arguments of the function.
Called from the simplify() method of each function.
the result of simplifying the arguments of the expression |
| typeCheck | | public Expression typeCheck(StaticContext env, ItemType contextItemType) throws XPathException(Code) | | Type-check the expression. This also calls preEvaluate() to evaluate the function
if all the arguments are constant; functions that do not require this behavior
can override the preEvaluate method.
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