net.sf.joost.grammar.tree
Class FunctionTree
java.lang.Object
net.sf.joost.grammar.Tree
net.sf.joost.grammar.tree.FunctionTree
- All Implemented Interfaces:
- Cloneable
public final class FunctionTree
- extends Tree
Objects of FunctionTree represent function calls in the syntax tree of a
pattern or an STXPath expression.
- Version:
- $Revision: 1.8 $ $Date: 2009/08/21 12:46:18 $
- Author:
- Oliver Becker
Field Summary |
private net.sf.joost.stx.function.FunctionFactory.Instance |
func
the function instance |
Fields inherited from class net.sf.joost.grammar.Tree |
ADD, AND, ATTR, ATTR_LOCAL_WILDCARD, ATTR_URI_WILDCARD, ATTR_WILDCARD, AVT, CDATA_TEST, CHILD, COMMENT_TEST, DDOT, DESC, DIV, DOT, EQ, FUNCTION, GE, GT, LE, left, LIST, lName, LOCAL_WILDCARD, LT, MOD, MULT, NAME_TEST, NE, NODE_TEST, NUMBER, OR, PI_TEST, PREDICATE, right, ROOT, SEQ, STRING, SUB, TEXT_TEST, type, UNION, uri, URI_WILDCARD, value, VALUE, VAR, WILDCARD |
func
private net.sf.joost.stx.function.FunctionFactory.Instance func
- the function instance
FunctionTree
public FunctionTree(String qName,
Tree left,
ParseContext context)
throws SAXParseException
- Constructs a FunctionTree object.
- Parameters:
qName
- the qualified function nameleft
- the parameterscontext
- the parse context
- Throws:
SAXParseException
evaluate
public Value evaluate(Context context,
int top)
throws SAXException
- Description copied from class:
Tree
- Evaluates the current Tree if it represents an expression.
- Overrides:
evaluate
in class Tree
- Parameters:
context
- the current Contexttop
- the part of the stack to be considered for the evaluation
(the upper most element is at position top-1)
- Returns:
- a new computed Value object containing the result
- Throws:
SAXException
isConstant
public boolean isConstant()
- Overrides:
isConstant
in class Tree
- Returns:
- whether the expression represented by this tree is constant