org.geotools.feature.type

Class AbstractLazyComplexTypeImpl

Object

AbstractLazyAttributeTypeImpl

AbstractLazyComplexTypeImpl

All Implemented Interfaces:

AttributeType, ComplexType, PropertyType

public abstract class AbstractLazyComplexTypeImpl
extends AbstractLazyAttributeTypeImpl
implements ComplexType

A replacement for ComplexTypeImpl with lazy evaluation of descriptors, to support cyclically-defined types. Note that type equality is defined by name, so do not allow different types with the same name to be put in any Collection.

Inspired by ComplexTypeImpl.

Author:

Ben Caradoc-Davies (CSIRO Earth Science and Resource Engineering)

See Also:

ComplexTypeImpl

Constructor Summary

Constructors

Constructor and Description
AbstractLazyComplexTypeImpl(Name name, boolean identified, boolean isAbstract, List<Filter> restrictions, InternationalString description) Constructor arguments have the same meaning as in ComplexTypeImpl.

Method Summary

Modifier and Type	Method and Description
abstract Collection<PropertyDescriptor>	buildDescriptors() Subclasses must override this method to return the list of descriptors that define the properties of this type.
Class<Collection<Property>>	getBinding() The java class that values of properties of the property type are bound to.
PropertyDescriptor	getDescriptor(Name name) Describe a single property by name.
PropertyDescriptor	getDescriptor(String name) The namespace-ignorant version of getDescriptor(Name).
Collection<PropertyDescriptor>	getDescriptors() The property descriptor which compose the complex type.
boolean	isInline() Indicates ability of XPath to notice this attribute.
String	toString()

Methods inherited from class AbstractLazyAttributeTypeImpl

buildSuper, equals, getDescription, getName, getRestrictions, getSuper, getUserData, hashCode, isAbstract, isIdentified

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface AttributeType

getSuper, isIdentified

Methods inherited from interface PropertyType

equals, getDescription, getName, getRestrictions, getUserData, hashCode, isAbstract

Constructor Detail

AbstractLazyComplexTypeImpl

public AbstractLazyComplexTypeImpl(Name name,
                                   boolean identified,
                                   boolean isAbstract,
                                   List<Filter> restrictions,
                                   InternationalString description)

Constructor arguments have the same meaning as in ComplexTypeImpl.

Method Detail

buildDescriptors

public abstract Collection<PropertyDescriptor> buildDescriptors()

Subclasses must override this method to return the list of descriptors that define the properties of this type. This method will only be called once at most.

If the type has no properties, return either an empty collection or null.

Returns:

a collection of descriptors or null if empty

getBinding

public Class<Collection<Property>> getBinding()

Description copied from interface: PropertyType

The java class that values of properties of the property type are bound to.

This value is never null.

Specified by:

getBinding in interface ComplexType

Specified by:

getBinding in interface PropertyType

Overrides:

getBinding in class AbstractLazyAttributeTypeImpl

Returns:

The binding of the property type.

See Also:

AbstractLazyAttributeTypeImpl.getBinding()

getDescriptors

public Collection<PropertyDescriptor> getDescriptors()

Description copied from interface: ComplexType

The property descriptor which compose the complex type.

A complex type can be composed of attributes and associations which means this collection returns instances of AttributeDescriptor and AssociationDescriptor.

Specified by:

getDescriptors in interface ComplexType

Returns:

Collection of descriptors representing the composition of the complex type.

See Also:

ComplexType.getDescriptors()

getDescriptor

public PropertyDescriptor getDescriptor(Name name)

Description copied from interface: ComplexType

Describe a single property by name.

This method returns null if no such property is found.

Specified by:

getDescriptor in interface ComplexType

Parameters:

name - The name of the property to get.

Returns:

The property matching the specified name, or null.

See Also:

ComplexType.getDescriptor(org.opengis.feature.type.Name)

isInline

public boolean isInline()

Description copied from interface: ComplexType

Indicates ability of XPath to notice this attribute.

This facility is used to "hide" an attribute from XPath searches, while the compelx contents will still be navigated no additional nesting will be considered. It will be as if the content were "folded" inline resulting in a flatter nesting structure.

Construct described using Java Interfaces:

 interface TestSample {
     String name;
     List measurement;
 }
 interface Measurement {
     long timestamp;
     Point point;
     long reading;
 }
 

The above is can hold the following information:

 [ name="survey1",
   measurements=(
       [timestamp=3,point=(2,3), reading=4200],
       [timestamp=9,point=(2,4), reading=445600],
   )
 ]
 

Out of the box this is represented to XPath as the following tree:

 root/name: survey1
 root/measurement[0]/timestamp:3
 root/measurement[0]/point: (2,3)
 root/measurement[0]/reading: 4200
 root/measurement[1]/timestamp:9
 root/measurement[2]/point: (2,4)
 root/measurement[3]/reading: 445600
 

By inlining Measurement we can achive the following:

 root/name: survey1
 root/timestamp[0]:3
 root/point[0]: (2,3)
 root/reading[0]: 4200
 root/timestamp[1]:9
 root/point[1]: (2,4)
 root/reading[1] 445600
 

Specified by:

isInline in interface ComplexType

Returns:

true if attribute is to be considered transparent by XPath queries

See Also:

ComplexType.isInline()

toString

public String toString()

Overrides:

toString in class AbstractLazyAttributeTypeImpl

See Also:

AbstractLazyAttributeTypeImpl.toString()

getDescriptor

public PropertyDescriptor getDescriptor(String name)

The namespace-ignorant version of getDescriptor(Name). Note that we honour the same permissive algorithm as ComplexTypeImpl: (1) try no-namespace, (2) try container-namespace, (2) search for match ignoring namespace. *Shudder*. Warning: Any code that uses this method instead of getDescriptor(Name) is * inherently unsafe.

Specified by:

getDescriptor in interface ComplexType

Parameters:

name - The name of the property to get.

Returns:

The property matching the specified name, or null.

See Also:

ComplexType.getDescriptor(java.lang.String)