public abstract class Function extends Expression
Constructor and Description |
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Function() |
Modifier and Type | Method and Description |
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void |
callArgVisitors(XPathVisitor visitor)
Call the visitors for the function arguments.
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void |
callVisitors(ExpressionOwner owner,
XPathVisitor visitor)
This will traverse the heararchy, calling the visitor for
each member.
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void |
checkNumberArgs(int argNum)
Check that the number of arguments passed to this function is correct.
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boolean |
deepEquals(Expression expr)
Compare this object with another object and see
if they are equal, include the sub heararchy.
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XObject |
execute(XPathContext xctxt)
Execute an XPath function object.
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void |
postCompileStep(Compiler compiler)
This function is currently only being used by Position()
and Last().
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protected void |
reportWrongNumberArgs()
Constructs and throws a WrongNumberArgException with the appropriate
message for this function object.
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void |
setArg(Expression arg,
int argNum)
Set an argument expression for a function.
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asIterator, asIteratorRaw, asNode, assertion, bool, canTraverseOutsideSubtree, error, execute, execute, execute, executeCharsToContentHandler, exprAddChild, exprGetChild, exprGetNumChildren, exprGetParent, exprSetParent, fixupVariables, getColumnNumber, getExpressionOwner, getLineNumber, getPublicId, getSystemId, isNodesetExpr, isSameClass, isStableNumber, num, warn, xstr
public void setArg(Expression arg, int argNum) throws WrongNumberArgsException
arg
- non-null expression that represents the argument.argNum
- The argument number index.WrongNumberArgsException
- If the argNum parameter is beyond what
is specified for this function.public void checkNumberArgs(int argNum) throws WrongNumberArgsException
argNum
- The number of arguments that is being passed to the function.WrongNumberArgsException
protected void reportWrongNumberArgs() throws WrongNumberArgsException
WrongNumberArgsException
public XObject execute(XPathContext xctxt) throws TransformerException
execute
in class Expression
xctxt
- The execution current context.TransformerException
public void callArgVisitors(XPathVisitor visitor)
public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
XPathVisitable
owner
- The owner of the visitor, where that path may be
rewritten if needed.visitor
- The visitor whose appropriate method will be called.XPathVisitable.callVisitors(ExpressionOwner, XPathVisitor)
public boolean deepEquals(Expression expr)
Expression
deepEquals
in class Expression
expr
- Another expression object.Expression.deepEquals(Expression)
public void postCompileStep(Compiler compiler)
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