FeatureChainedAttributeVisitor (Geotools modules 30-SNAPSHOT API)

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	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 Description

FeatureChainedAttributeVisitor(FeatureTypeMapping root)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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)
```