Package org.apache.sis.filter

Class LeafExpression.Transformed<R,V>

java.lang.Object

org.apache.sis.internal.filter.Node

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

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

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

Type Parameters:

R - the type of resources used as inputs.

V - the type of value computed by the expression.

All Implemented Interfaces:

Serializable, Function<R,V>, Expression<R,V>, Optimization.OnExpression<R,V>, FeatureExpression<R,V>, Literal<R,V>

Enclosing class:

LeafExpression<R,V>

static final class LeafExpression.Transformed<R,V>
extends LeafExpression.Literal<R,V>
implements Optimization.OnExpression<R,V>

A literal value which is the result of transforming another literal.

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
(package private) final Expression<R,?>	original	The original expression.
private static final long	serialVersionUID	For cross-version compatibility.

Fields inherited from class org.apache.sis.filter.LeafExpression.Literal

value

Constructor Summary

Constructors

Constructor	Description
Transformed(V value, Expression<R,?> original)	Creates a new literal holding the given constant value.

Method Summary

Modifier and Type	Method	Description
Expression<? super R,? extends V>	optimize(Optimization optimization)	Returns the same literal without the reference to the original expression.
<N> Expression<R,N>	toValueType(Class<N> target)	Converts the transformed value if possible, or the original value as a fallback.

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

apply, expectedType, getChildren, getValue, getValueClass

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

apply

Methods inherited from interface java.util.function.Function

andThen, compose

Methods inherited from interface org.apache.sis.internal.geoapi.filter.Literal

getFunctionName, getParameters

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

original

final Expression<R,?> original

The original expression.

Constructor Details

Transformed

Transformed(V value,
 Expression<R,?> original)

Creates a new literal holding the given constant value.

Method Details

optimize

public Expression<? super R,? extends V> optimize(Optimization optimization)

Returns the same literal without the reference to the original expression. Since this Transformed instance will not longer be unwrapped, the transformed value will become visible to users.

Specified by:

optimize in interface Optimization.OnExpression<R,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.

toValueType

public <N> Expression<R,N> toValueType(Class<N> target)

Converts the transformed value if possible, or the original value as a fallback.

Specified by:

toValueType in interface Expression<R,V>

Overrides:

toValueType in class LeafExpression.Literal<R,V>

Type Parameters:

N - compile-time value of type.

Parameters:

target - desired type of expression results.

Returns:

expression doing the same operation this this expression but with results of the specified type.

Throws:

ClassCastException - if values cannot be provided as instances of the specified class.