org.deegree.feature.xpath
Class FeatureXPathEvaluator

java.lang.Object
  org.deegree.feature.xpath.FeatureXPathEvaluator

All Implemented Interfaces:

XPathEvaluator<Feature>

public class FeatureXPathEvaluator
extends java.lang.Object
implements XPathEvaluator<Feature>

XPathEvaluator for Feature objects.

Version:

$Revision: 27703 $, $Date: 2010-11-01 20:10:39 +0100 (Mo, 01. Nov 2010) $

Author:

Markus Schneider, last edited by: $Author: mschneider $

Constructor Summary

FeatureXPathEvaluator(GMLVersion version)
Creates a new FeatureXPathEvaluator instance.

Method Summary

static void	enableCache() temporary hack to enable caching again
TypedObjectNode[]	eval(Feature context, PropertyName propName) Returns the values that are selected by evaluating the given XPath 1.0 expression using the context object.
TypedObjectNode[]	eval(GenericXMLElement element, PropertyName propName)
TypedObjectNode[]	eval(Property prop, PropertyName propName)
java.lang.String	getId(Feature context) Returns the identifier of the given context object.

Methods inherited from class java.lang.Object

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

Constructor Detail

FeatureXPathEvaluator

public FeatureXPathEvaluator(GMLVersion version)

Creates a new FeatureXPathEvaluator instance.

Parameters:

version - gml version (determines the names and types of GML standard properties), must not be null

Method Detail

enableCache

public static void enableCache()

temporary hack to enable caching again

eval

public TypedObjectNode[] eval(Feature context,
                              PropertyName propName)
                       throws FilterEvaluationException

Description copied from interface: XPathEvaluator

Returns the values that are selected by evaluating the given XPath 1.0 expression using the context object.

Specified by:

eval in interface XPathEvaluator<Feature>

Parameters:

context - object that the expression is evaluated upon, must not be null

propName - XPath expression (usually selects a property, hence the name)

Returns:

the selected values, never null and contains at least one entry

Throws:

FilterEvaluationException - if an exception occurs during the evaluation of the XPath expression

eval

public TypedObjectNode[] eval(Property prop,
                              PropertyName propName)
                       throws FilterEvaluationException

Throws:

FilterEvaluationException

eval

public TypedObjectNode[] eval(GenericXMLElement element,
                              PropertyName propName)
                       throws FilterEvaluationException

Throws:

FilterEvaluationException

getId

public java.lang.String getId(Feature context)

Description copied from interface: XPathEvaluator

Returns the identifier of the given context object.

Specified by:

getId in interface XPathEvaluator<Feature>

Parameters:

context - context object, never null

Returns:

the identifier, can be null