Class PropertyValue.Converted<V>

java.lang.Object

org.apache.sis.internal.filter.Node

org.apache.sis.filter.LeafExpression<AbstractFeature, V>

org.apache.sis.filter.PropertyValue<V>

org.apache.sis.filter.PropertyValue.Converted<V>

Type Parameters:

V - the type of value computed by the expression.

All Implemented Interfaces:

Serializable, Function<AbstractFeature, V>, Expression<AbstractFeature, V>, Optimization.OnExpression<AbstractFeature, V>, FeatureExpression<AbstractFeature, V>, ValueReference<AbstractFeature, V>

Direct Known Subclasses:

PropertyValue.CastedAndConverted

Enclosing class:

PropertyValue<V>

private static class PropertyValue.Converted<V>
extends PropertyValue<V>

An expression fetching property values as an object of specified type. The value is converted from Object to the specified type.

Since:

1.1

Version:

1.2

Nested Class Summary

Nested classes/interfaces inherited from class LeafExpression

LeafExpression.Literal<R,V>, LeafExpression.Transformed<R,V>

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	serialVersionUID	For cross-version compatibility.
protected final Class<V>	type	The desired type of values.

Fields inherited from class PropertyValue

isVirtual, name, VIRTUAL_PREFIX

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Converted(Class<V> type, String xpath, boolean isVirtual)	Creates a new expression retrieving values from a property of the given name.

Method Summary

Modifier and Type	Method	Description
V	apply(AbstractFeature instance)	Returns the value of the property of the given name.
final PropertyTypeBuilder	expectedType(DefaultFeatureType valueType, FeatureTypeBuilder addTo)	Provides the expected type of values produced by this expression when a feature of the given type is evaluated.
final Class<V>	getValueClass()	Returns the type of values computed by this expression.
final PropertyValue<V>	optimize(Optimization optimization)	Tries to optimize this expression.

Methods inherited from class PropertyValue

create, expectedType, getChildren, getFunctionName, getSourceClass, getXPath, toValueType

Methods inherited from class LeafExpression

getParameters

Methods inherited from class Node

createName, createType, equals, getGeometryLibrary, hashCode, symbol, toGeometryWrapper, toString, unwrap, warning

Methods inherited from class Object

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

Methods inherited from interface Expression

getParameters

Methods inherited from interface Function

andThen, compose

Methods inherited from interface Optimization.OnExpression

recreate

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

type

protected final Class<V> type

The desired type of values.

Constructor Details

Converted

protected Converted(Class<V> type,
 String xpath,
 boolean isVirtual)

Creates a new expression retrieving values from a property of the given name.

Parameters:

type - the desired type for the expression result.

name - the name of the property to fetch.

Method Details

getValueClass

public final Class<V> getValueClass()

Returns the type of values computed by this expression.

Returns:

the type of values computed by this expression.

apply

public V apply(AbstractFeature instance)

Returns the value of the property of the given name. If no value is found for the given feature, then this method returns null.

Parameters:

instance - the object to be evaluated by the expression. Can be null if this expression allows null values.

Returns:

value computed by the expression.

optimize

public final PropertyValue<V> optimize(Optimization optimization)

Tries to optimize this expression. If an ObjectConverter can be determined in advance for the feature type for which to optimize, then a specialized expression is returned. Otherwise this method returns this.

Specified by:

optimize in interface Optimization.OnExpression<AbstractFeature, V>

Specified by:

optimize in class PropertyValue<V>

Parameters:

optimization - the simplifications or optimizations to apply on this expression.

Returns:

the simplified or optimized expression, or this if no optimization has been applied.

expectedType

public final PropertyTypeBuilder expectedType(DefaultFeatureType valueType,
 FeatureTypeBuilder addTo)

Provides the expected type of values produced by this expression when a feature of the given type is evaluated.

Specified by:

expectedType in interface FeatureExpression<AbstractFeature, V>

Overrides:

expectedType in class PropertyValue<V>

Parameters:

valueType - the type of features to be evaluated by the given expression.

addTo - where to add the type of properties evaluated by the given expression.

Returns:

builder of the added property, or null if this method cannot add a property.