Package org.jaxen.expr
Interface Expr
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- All Superinterfaces:
java.io.Serializable
- All Known Subinterfaces:
AdditiveExpr
,BinaryExpr
,EqualityExpr
,FilterExpr
,FunctionCallExpr
,LiteralExpr
,LocationPath
,LogicalExpr
,MultiplicativeExpr
,NumberExpr
,PathExpr
,RelationalExpr
,UnaryExpr
,UnionExpr
,VariableReferenceExpr
- All Known Implementing Classes:
DefaultFilterExpr
public interface Expr extends java.io.Serializable
Represents an XPath expression. This is production 14 in the XPath 1.0 specification:[14] Expr ::= OrExpr
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description java.lang.Object
evaluate(Context context)
Evaluate the expression in the given context, and return the result.java.lang.String
getText()
Returns a String containing the XPath expression.Expr
simplify()
Simplifies the XPath expression.
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Method Detail
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getText
java.lang.String getText()
Returns a String containing the XPath expression.- Returns:
- the text form of this XPath expression
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simplify
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.- Returns:
- the simplified expression
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evaluate
java.lang.Object evaluate(Context context) throws JaxenException
Evaluate the expression in the given context, and return 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
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