Package org.jaxen.expr
Interface Predicate
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- All Superinterfaces:
java.io.Serializable
public interface Predicate extends java.io.Serializable
Represents an XPath predicate such as[position() = last()]
. This is production 8 and 9 in the XPath 1.0 specification:[8] Predicate ::= '[' PredicateExpr ']' [9] PredicateExpr ::= Expr
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description java.lang.Object
evaluate(Context context)
Evaluates this predicate's expression and returns the result.Expr
getExpr()
Returns the expression in this predicate.java.lang.String
getText()
Returns the string form of the predicate, including the square brackets.void
setExpr(Expr expr)
Change the expression used by this predicate.void
simplify()
Simplify the expression in this predicate.
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Method Detail
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getExpr
Expr getExpr()
Returns the expression in this predicate.- Returns:
- the expression between the brackets
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setExpr
void setExpr(Expr expr)
Change the expression used by this predicate.- Parameters:
expr
- the new expression
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simplify
void simplify()
Simplify the expression in this predicate.- See Also:
Expr.simplify()
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getText
java.lang.String getText()
Returns the string form of the predicate, including the square brackets.- Returns:
- the bracketed form of this predicate
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evaluate
java.lang.Object evaluate(Context context) throws JaxenException
Evaluates this predicate's expression and returns the result. The result will be ajava.lang.Double
for expressions that return a number, ajava.lang.String
for expressions that return a string, ajava.lang.Boolean
for expressions that return a boolean, and ajava.util.List
for expressions that return a node-set. In the latter case, the elements of the list are the actual objects from the source document model. Copies are not made.- Parameters:
context
- the context in which the expression is evaluated- Returns:
- an object representing the result of the evaluation
- Throws:
JaxenException
- See Also:
Expr.evaluate(Context)
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