Package org.apache.sis.filter

Class PropertyValue.CastedAndConverted<S,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>

org.apache.sis.filter.PropertyValue.CastedAndConverted<S,V>

Type Parameters:

S - the type of source value before conversion.

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>

Enclosing class:

PropertyValue<V>

private static final class PropertyValue.CastedAndConverted<S,V>
extends PropertyValue.Converted<V>

An expression fetching property values as an object of specified type. The value is first casted from Object to the expected source type, then converted to the specified target type.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.sis.filter.LeafExpression

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

Field Summary

Fields

Modifier and Type	Field	Description
private final ObjectConverter<? super S,? extends V>	converter	The conversion from source type to the type to be returned.
private static final long	serialVersionUID	For cross-version compatibility.
private final Class<S>	source	The source type before conversion.

Fields inherited from class org.apache.sis.filter.PropertyValue.Converted

type

Fields inherited from class org.apache.sis.filter.PropertyValue

isVirtual, name, VIRTUAL_PREFIX

Constructor Summary

Constructors

Constructor	Description
CastedAndConverted(Class<S> source, 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.
protected Class<S>	getSourceClass()	Returns the type of values fetched from AbstractFeature instance.

Methods inherited from class org.apache.sis.filter.PropertyValue.Converted

expectedType, getValueClass, optimize

Methods inherited from class org.apache.sis.filter.PropertyValue

create, expectedType, getChildren, getFunctionName, getXPath, toValueType

Methods inherited from class org.apache.sis.filter.LeafExpression

getParameters

Methods inherited from class org.apache.sis.internal.filter.Node

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.sis.filter.Expression

getParameters

Methods inherited from interface java.util.function.Function

andThen, compose

Methods inherited from interface org.apache.sis.filter.Optimization.OnExpression

recreate

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

source

private final Class<S> source

The source type before conversion.

converter

private final ObjectConverter<? super S,? extends V> converter

The conversion from source type to the type to be returned.

Constructor Details

CastedAndConverted

CastedAndConverted(Class<S> source,
 Class<V> type,
 String xpath,
 boolean isVirtual)

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

Method Details

getSourceClass

protected Class<S> getSourceClass()

Returns the type of values fetched from AbstractFeature instance.

Overrides:

getSourceClass in class PropertyValue<V>

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.

Specified by:

apply in interface Expression<S,V>

Specified by:

apply in interface Function<S,V>

Overrides:

apply in class PropertyValue.Converted<V>

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.