Package org.jaxen.javabean
Class JavaBeanXPath
- java.lang.Object
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- org.jaxen.BaseXPath
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- org.jaxen.javabean.JavaBeanXPath
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- All Implemented Interfaces:
java.io.Serializable
,XPath
public class JavaBeanXPath extends BaseXPath
An XPath implementation for JavaBeans.This is the main entry point for matching an XPath against a JavaBean tree. You create a compiled XPath object, then match it against one or more context nodes using the
BaseXPath.selectNodes(Object)
method, as in the following example:Node node = ...; XPath path = new JavaBeanXPath("a/b/c"); List results = path.selectNodes(node);
- Version:
- $Revision$
- See Also:
BaseXPath
, Serialized Form
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Field Summary
Fields Modifier and Type Field Description private static long
serialVersionUID
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Constructor Summary
Constructors Constructor Description JavaBeanXPath(java.lang.String xpathExpr)
Construct given an XPath expression string.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
evaluate(java.lang.Object node)
Evaluate this XPath against a given context.protected Context
getContext(java.lang.Object node)
Create aContext
wrapper for the provided implementation-specific object.-
Methods inherited from class org.jaxen.BaseXPath
addNamespace, booleanValueOf, createFunctionContext, createNamespaceContext, createVariableContext, debug, getContextSupport, getFunctionContext, getNamespaceContext, getNavigator, getRootExpr, getVariableContext, numberValueOf, selectNodes, selectNodesForContext, selectSingleNode, selectSingleNodeForContext, setFunctionContext, setNamespaceContext, setVariableContext, stringValueOf, toString, valueOf
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Field Detail
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serialVersionUID
private static final long serialVersionUID
- See Also:
- Constant Field Values
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Constructor Detail
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JavaBeanXPath
public JavaBeanXPath(java.lang.String xpathExpr) throws JaxenException
Construct given an XPath expression string.- Parameters:
xpathExpr
- The XPath expression.- Throws:
JaxenException
- if there is a syntax error while parsing the expression
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Method Detail
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getContext
protected Context getContext(java.lang.Object node)
Description copied from class:BaseXPath
Create aContext
wrapper for the provided implementation-specific object.- Overrides:
getContext
in classBaseXPath
- Parameters:
node
- the implementation-specific object to be used as the context- Returns:
- a
Context
wrapper around the object
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evaluate
public java.lang.Object evaluate(java.lang.Object node) throws JaxenException
Description copied from class:BaseXPath
Evaluate this XPath against a given context. The context of evaluation may be any object type the navigator recognizes as a node. The return value is either aString
,Double
,Boolean
, orList
of nodes.When using this method, one must be careful to test the class of the returned object. If the returned object is a list, then the items in this list will be the actual
Document
,Element
,Attribute
, etc. objects as defined by the concrete XML object-model implementation, directly from the context document. This method does not return copies of anything, but merely returns references to objects within the source document.- Specified by:
evaluate
in interfaceXPath
- Overrides:
evaluate
in classBaseXPath
- Parameters:
node
- the node, node-set or Context object for evaluation. This value can be null.- Returns:
- the result of evaluating the XPath expression against the supplied context
- Throws:
JaxenException
- if an XPath error occurs during expression evaluation
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