Package org.apache.sis.filter

Class PropertyValue.AsObject

java.lang.Object

org.apache.sis.internal.filter.Node

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

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

org.apache.sis.filter.PropertyValue.AsObject

All Implemented Interfaces:

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

Enclosing class:

PropertyValue<V>

private static final class PropertyValue.AsObject
extends PropertyValue<Object>

An expression fetching property values as Object. This expression does not need to apply any type conversion.

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 static final long	serialVersionUID	For cross-version compatibility.

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

isVirtual, name, VIRTUAL_PREFIX

Constructor Summary

Constructors

Constructor	Description
AsObject(String name, boolean isVirtual)	Creates a new expression retrieving values from a property of the given name.

Method Summary

Modifier and Type	Method	Description
Object	apply(AbstractFeature instance)	Returns the value of the property of the name given at construction time.
PropertyValue<Object>	optimize(Optimization optimization)	If the evaluated property is a link, replaces this expression by a more direct reference to the target property.

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

create, expectedType, expectedType, getChildren, getFunctionName, getSourceClass, 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 org.apache.sis.internal.feature.FeatureExpression

getValueClass

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

Constructor Details

AsObject

AsObject(String name,
 boolean isVirtual)

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

Method Details

apply

public Object apply(AbstractFeature instance)

Returns the value of the property of the name given at construction time. 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 PropertyValue<Object> optimize(Optimization optimization)

If the evaluated property is a link, replaces this expression by a more direct reference to the target property. This optimization is important for allowing SQLStore to put the column name in the SQL WHERE clause. It makes the difference between using or not the database index.

Specified by:

optimize in interface Optimization.OnExpression<AbstractFeature,Object>

Specified by:

optimize in class PropertyValue<Object>

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.