org.geotools.data.complex.filter

Class FeatureChainedAttributeVisitor

Object

DefaultExpressionVisitor

FeatureChainedAttributeVisitor

All Implemented Interfaces:

ExpressionVisitor

public class FeatureChainedAttributeVisitor
extends DefaultExpressionVisitor

Expression visitor that uses the attribute and mapping information provided by a FeatureTypeMapping object to determine which nested feature types / attributes must be traversed to reach the attribute identified by the provided PropertyName expression.

The provided FeatureTypeMapping object is regarded as the root mapping against which the expression is evaluated.

The nested attribute mappings are returned as a list of FeatureChainedAttributeVisitor.FeatureChainLink objects; the first one in the list always refers to the root mapping.

Author:

Stefano Costa, GeoSolutions

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	FeatureChainedAttributeVisitor.FeatureChainedAttributeDescriptor Descriptor class holding information about a feature chained attribute, i.e. an attribute belonging to a feature type that is linked to a root feature type via feature chaining.
static class	FeatureChainedAttributeVisitor.FeatureChainLink Represents a single link in the "chain" of feature types that need to be linked to go from the root type to a nested attribute.

Constructor Summary

Constructors

Constructor and Description
FeatureChainedAttributeVisitor(FeatureTypeMapping root)

Method Summary

Modifier and Type	Method and Description
boolean	conditionalMappingWasFound() Tells clients whether or not a conditional mapping was found in the feature chain when the latest expression was visited.
List<FeatureChainedAttributeVisitor.FeatureChainedAttributeDescriptor>	getFeatureChainedAttributes() Returns an object describing the sequence of feature chaining links that must be traversed to reach the attribute specified by the visited expression.
boolean	isUnboundedNestedElementFound()
protected boolean	startsWith(XPathUtil.StepList one, XPathUtil.StepList other)
Object	visit(PropertyName expression, Object data)

Methods inherited from class DefaultExpressionVisitor

visit, visit, visit, visit, visit, visit, visit

Methods inherited from class Object

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

Constructor Detail

FeatureChainedAttributeVisitor

public FeatureChainedAttributeVisitor(FeatureTypeMapping root)

Method Detail

visit

public Object visit(PropertyName expression,
                    Object data)

Specified by:

visit in interface ExpressionVisitor

Overrides:

visit in class DefaultExpressionVisitor

isUnboundedNestedElementFound

public boolean isUnboundedNestedElementFound()

getFeatureChainedAttributes

public List<FeatureChainedAttributeVisitor.FeatureChainedAttributeDescriptor> getFeatureChainedAttributes()

Returns an object describing the sequence of feature chaining links that must be traversed to reach the attribute specified by the visited expression.

Returns:

a feature chained attribute descriptor, or null if none was found

conditionalMappingWasFound

public boolean conditionalMappingWasFound()

Tells clients whether or not a conditional mapping was found in the feature chain when the latest expression was visited.

Returns:

true if a conditional mapping was found in the feature chain, false otherwise

startsWith

protected boolean startsWith(XPathUtil.StepList one,
                             XPathUtil.StepList other)