org.jaxen.javabean
Class JavaBeanXPath
- Serializable, XPath
public class JavaBeanXPath
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
selectNodes(Object)
method, as in the following example:
Node node = ...;
XPath path = new JavaBeanXPath("a/b/c");
List results = path.selectNodes(node);
JavaBeanXPath(String xpathExpr) - Construct given an XPath expression string.
|
Object | evaluate(Object node) - Evaluate this XPath against a given context.
|
protected Context | getContext(Object node) - Create a
Context wrapper for the provided
implementation-specific object.
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addNamespace , booleanValueOf , createFunctionContext , createNamespaceContext , createVariableContext , debug , evaluate , getContext , getContextSupport , getFunctionContext , getNamespaceContext , getNavigator , getRootExpr , getVariableContext , numberValueOf , selectNodes , selectNodesForContext , selectSingleNode , selectSingleNodeForContext , setFunctionContext , setNamespaceContext , setVariableContext , stringValueOf , toString , valueOf |
serialVersionUID
private static final long serialVersionUID
JavaBeanXPath
public JavaBeanXPath(String xpathExpr)
throws JaxenException
Construct given an XPath expression string.
xpathExpr
- The XPath expression.
JaxenException
- if there is a syntax error while
parsing the expression
evaluate
public Object evaluate(Object node)
throws JaxenException
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 a
String
,
Double
,
Boolean
, or
List
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.
- evaluate in interface XPath
- evaluate in interface BaseXPath
- the result of evaluating the XPath expression
against the supplied context
JaxenException
- if an XPath error occurs during expression evaluation
getContext
protected Context getContext(Object node)
Create a
Context
wrapper for the provided
implementation-specific object.
- getContext in interface BaseXPath
node
- the implementation-specific object
to be used as the context
- a
Context
wrapper around the object