net.shibboleth.metadata.dom
Class XPathItemSelectionStrategy

java.lang.Object
  net.shibboleth.metadata.dom.XPathItemSelectionStrategy

All Implemented Interfaces:

ItemSelectionStrategy<DomElementItem>

@ThreadSafe
public class XPathItemSelectionStrategy
extends Object
implements ItemSelectionStrategy<DomElementItem>

Item selection strategy which selects items on the basis of a boolean XPath expression.

Field Summary

private XPathExpression	compiledExpression Compiled form of the expression.
private Logger	log Class logger.
private NamespaceContext	namespaceContext The NamespaceContext to use in interpreting the XPath expression.

Constructor Summary

XPathItemSelectionStrategy(String expression, NamespaceContext context)
Constructor.

Method Summary

boolean

isSelectedItem(DomElementItem item) Determines if the item meets the expected criteria.

Methods inherited from class java.lang.Object

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

Field Detail

log

private final Logger log

Class logger.

compiledExpression

private final XPathExpression compiledExpression

Compiled form of the expression. XPathExpression objects are reusable but are not thread-safe, so access to the compiled expression must be protected.

namespaceContext

private final NamespaceContext namespaceContext

The NamespaceContext to use in interpreting the XPath expression.

Constructor Detail

XPathItemSelectionStrategy

public XPathItemSelectionStrategy(String expression,
                                  NamespaceContext context)
                           throws XPathExpressionException

Constructor.

Parameters:

expression - XPath expression to execute.

context - Namespace context to use for the expression, expressed as a NamespaceContext.

Throws:

XPathExpressionException - if there is a problem compiling the expression

Method Detail

isSelectedItem

public boolean isSelectedItem(DomElementItem item)

Determines if the item meets the expected criteria.

Specified by:

isSelectedItem in interface ItemSelectionStrategy<DomElementItem>

Parameters:

item - the being inspected, never null

Returns:

true of the item meets the expected criteria, false otherwise