Package scriptella.driver.xpath

Class XPathQueryExecutor

java.lang.Object

scriptella.driver.xpath.XPathQueryExecutor

All Implemented Interfaces:

ParametersCallback

public class XPathQueryExecutor
extends Object
implements ParametersCallback

Executor for XPath queries.

Version:

1.0

Author:

Fyodor Kupolov, Martin Alderson

Constructor Summary

Constructors

Constructor	Description
XPathQueryExecutor(ThreadLocal<Node> context, Document document, Resource xpathResource, scriptella.driver.xpath.XPathExpressionCompiler compiler, AbstractConnection.StatementCounter counter, boolean returnArrays)	Crates executor to query document using a specified xpath expression.

Method Summary

Modifier and Type	Method	Description
void	execute(QueryCallback queryCallback, ParametersCallback parentParameters)	Executes a query and notifies queryCallback for each found node.
Object	getParameter(String name)	Returns the value of parameter specified by name.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

XPathQueryExecutor

public XPathQueryExecutor(ThreadLocal<Node> context,
 Document document,
 Resource xpathResource,
 scriptella.driver.xpath.XPathExpressionCompiler compiler,
 AbstractConnection.StatementCounter counter,
 boolean returnArrays)

Crates executor to query document using a specified xpath expression.

Parameters:

context - thread local for sharing current node between queries. The instance of thread local is shared between all connection queries.

document - document to query.

xpathResource - resource with xpath expression.

compiler - xpath expression compiler

counter - statement counter.

returnArrays - true if string arrays should be returned for variables.

Method Details

execute

public void execute(QueryCallback queryCallback,
 ParametersCallback parentParameters)

Executes a query and notifies queryCallback for each found node.

Parameters:

queryCallback - callback to notify for each found node.

parentParameters - parent parameters to inherit.

getParameter

public Object getParameter(String name)

Description copied from interface: ParametersCallback

Returns the value of parameter specified by name.

The callback internally delegates a call to parent callbacks if the parameter cannot be found.

Specified by:

getParameter in interface ParametersCallback

Parameters:

name - parameter name. Providers are allowed (but not required) to ignore a case of the name parameter to comply with their internal model. For example JDBC drivers are case-insensitive to column names.

Returns:

parameter value or null if parameter doesn't exist.