Package org.apache.sis.filter

Class LeafExpression<R,V>

java.lang.Object

org.apache.sis.internal.filter.Node

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

Type Parameters:

R - the type of resources (e.g. Feature) used as inputs.

V - the type of value computed by the expression.

All Implemented Interfaces:

Serializable, Function<R,V>, Expression<R,V>, FeatureExpression<R,V>

Direct Known Subclasses:

AssociationValue, LeafExpression.Literal, PropertyValue

abstract class LeafExpression<R,V>
extends Node
implements FeatureExpression<R,V>

Expressions that do not depend on any other expression. Those expression may read value from a feature property, or return a constant value.

Since:

1.1

Version:

1.1

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static class	LeafExpression.Literal<R,V>	A constant, literal value that can be used in expressions.
(package private) static final class	LeafExpression.Transformed<R,V>	A literal value which is the result of transforming another literal.

Field Summary

Fields

Modifier and Type	Field	Description
private static final long	serialVersionUID	For cross-version compatibility.

Constructor Summary

Constructors

Constructor	Description
LeafExpression()	Creates a new property reader.

Method Summary

Modifier and Type	Method	Description
final List<Expression<? super R,?>>	getParameters()	Returns the expression used as parameters for this function, which is an empty list.

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

createName, createType, equals, getChildren, 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

apply, getFunctionName, toValueType

Methods inherited from interface org.apache.sis.internal.feature.FeatureExpression

expectedType, getValueClass

Methods inherited from interface java.util.function.Function

andThen, compose

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

Constructor Details

LeafExpression

LeafExpression()

Creates a new property reader.

Method Details

getParameters

public final List<Expression<? super R,?>> getParameters()

Returns the expression used as parameters for this function, which is an empty list.

Specified by:

getParameters in interface Expression<R,V>

Returns:

the sub-expressions to be evaluated, or an empty list if none.