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:
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 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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