XPathExecutor¶

public class XPathExecutor¶

XPathExecutor is an executor which evaluates a given xpath and yields the result.

Example:

XPathExecutor exec = new XPathExecutor(getDocument("doc.xml"));

exec.registerFunction("http://example.com", "sum", new MySum());

System.out.println(exec.eval( "3 + number('3') + eg:sum(3, 4, '5.1') + /values/one  - 2"));

// The result will be '17.1'

Author:	Hugo Y. K. Lam

Constructors¶

XPathExecutor¶

public XPathExecutor()¶: Creates a new instance of XPathExecutor.

XPathExecutor¶

public XPathExecutor(Node document)¶

Creates a new instance of XPathExecutor.

Parameters:	document – the document containing the context being queried and the namespaces being referenced.

XPathExecutor¶

public XPathExecutor(Node context, Node namespaces)¶

Creates a new instance of XPathExecutor.

Parameters:	context – the document containing the context being queried. namespaces – the document containing the namespaces being referenced.

Methods¶

eval¶

public Object eval(String expression)¶

Evaluates an XPath expression.

Parameters:	expression – the XPath expression.
Throws:	TransformerException – if unable to transform the expression.
Returns:	the evaluated result.

eval¶

public Object eval(String expression, Node context)¶

Evaluates an XPath expression.

Parameters:	expression – the XPath expression. context – the document containing the context being queried.
Throws:	TransformerException – if unable to transform the expression.
Returns:	the evaluated result.

registerFunction¶

public void registerFunction(String ns, String funcName, XPathFunction func)¶

Registers a function to be used in an XPath.

Parameters:	ns – the namespace of the function. funcName – the function name. func – the function implementation.

visit¶

public void visit(String expression, XPathVisitor visitor)¶

Evaluates an XPath expression.

Parameters:	expression – the XPath expression. visitor – the XPath visitor.
Throws:	TransformerException – if unable to transform the expression.