org.jaxen.expr
Interface Expr
- Serializable
- AdditiveExpr, BinaryExpr, EqualityExpr, FilterExpr, FunctionCallExpr, LiteralExpr, LocationPath, LogicalExpr, MultiplicativeExpr, NumberExpr, PathExpr, RelationalExpr, UnaryExpr, UnionExpr, VariableReferenceExpr
- DefaultAbsoluteLocationPath, DefaultAdditiveExpr, DefaultAndExpr, DefaultArithExpr, DefaultBinaryExpr, DefaultDivExpr, DefaultEqualityExpr, DefaultEqualsExpr, DefaultExpr, DefaultFilterExpr, DefaultFunctionCallExpr, DefaultGreaterThanEqualExpr, DefaultGreaterThanExpr, DefaultLessThanEqualExpr, DefaultLessThanExpr, DefaultLiteralExpr, DefaultLocationPath, DefaultLogicalExpr, DefaultMinusExpr, DefaultModExpr, DefaultMultiplicativeExpr, DefaultMultiplyExpr, DefaultNotEqualsExpr, DefaultNumberExpr, DefaultOrExpr, DefaultPathExpr, DefaultPlusExpr, DefaultRelationalExpr, DefaultRelativeLocationPath, DefaultTruthExpr, DefaultUnaryExpr, DefaultUnionExpr, DefaultVariableReferenceExpr
public interface Expr
extends Serializable
Object | evaluate(Context context) - Evaluate the expression in the given context, and return the result.
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String | getText() - Returns a String containing the XPath expression.
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Expr | simplify() - Simplifies the XPath expression.
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evaluate
public Object evaluate(Context context)
throws JaxenException
Evaluate the expression in the given context, and return the result.
The result will be a java.lang.Double
for expressions that
return a number, a java.lang.String
for expressions that
return a string, a java.lang.Boolean
for expressions that
return a boolean, and a java.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.
context
- the context in which the expression is evaluated
- an object representing the result of the evaluation
getText
public String getText()
Returns a String containing the XPath expression.
- the text form of this XPath expression
simplify
public Expr simplify()
Simplifies the XPath expression. For example, the expression
//para[1 = 1]
could be simplified to
//para
. In practice, this is usually a noop.
Jaxen does not currently perform any simplification.
- the simplified expression