Package org.apache.sis.internal.filter.sqlmm

Class TwoGeometries<R,G>

java.lang.Object

org.apache.sis.internal.filter.Node

org.apache.sis.internal.filter.sqlmm.SpatialFunction<R>

org.apache.sis.internal.filter.sqlmm.TwoGeometries<R,G>

Type Parameters:

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

G - the implementation type of geometry objects.

All Implemented Interfaces:

Serializable, Function<R,Object>, Expression<R,Object>, Optimization.OnExpression<R,Object>, FeatureExpression<R,Object>

Direct Known Subclasses:

TwoGeometries.WithArgument

class TwoGeometries<R,G>
extends SpatialFunction<R>

SQLMM spatial functions taking two geometry operands.

Since:

1.1

Version:

1.3

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static final class	TwoGeometries.WithArgument<R,G>	SQLMM spatial functions taking a single geometry operand with one argument.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) final Expression<? super R,GeometryWrapper<G>>	geometry1	The expression giving the geometries.
(package private) final Expression<? super R,GeometryWrapper<G>>	geometry2	The expression giving the geometries.
private static final long	serialVersionUID	For cross-version compatibility.

Fields inherited from class org.apache.sis.internal.filter.sqlmm.SpatialFunction

operation

Constructor Summary

Constructors

Constructor	Description
TwoGeometries(SQLMM operation, Expression<? super R,?>[] parameters, Geometries<G> library)	Creates a new function for geometries represented by the given parameter.

Method Summary

Modifier and Type	Method	Description
Object	apply(R input)	Evaluates the two first expressions as geometry objects, applies the operation and returns the result.
(package private) final Geometries<?>	getGeometryLibrary()	Returns a handler for the library of geometric objects used by this expression.
List<Expression<? super R,?>>	getParameters()	Returns the sub-expressions that will be evaluated to provide the parameters to the function.
Expression<? super R,?>	optimize(Optimization optimization)	If the CRS of the first argument is known in advance and the second argument is a literal, transforms the second geometry to the CRS of the first argument.
Expression<R,Object>	recreate(Expression<? super R,?>[] effective)	Creates a new expression of the same type than this expression, but with an optimized geometry.

Methods inherited from class org.apache.sis.internal.filter.sqlmm.SpatialFunction

expectedType, getChildren, getFunctionName, getSyntax, getValueClass, toValueType

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 java.util.function.Function

andThen, compose

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

geometry1

final Expression<? super R,GeometryWrapper<G>> geometry1

The expression giving the geometries.

geometry2

final Expression<? super R,GeometryWrapper<G>> geometry2

The expression giving the geometries.

Constructor Details

TwoGeometries

TwoGeometries(SQLMM operation,
 Expression<? super R,?>[] parameters,
 Geometries<G> library)

Creates a new function for geometries represented by the given parameter.

Method Details

recreate

public Expression<R,Object> recreate(Expression<? super R,?>[] effective)

Creates a new expression of the same type than this expression, but with an optimized geometry. The optimization may be a geometry computed immediately if all operator parameters are literals.

Parameters:

effective - the expressions to use as a replacement of this expression parameters.

Returns:

the new expression, or this if unsupported.

optimize

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

If the CRS of the first argument is known in advance and the second argument is a literal, transforms the second geometry to the CRS of the first argument. The transformed geometry is always the second argument because according SQLMM specification, operations shall be executed in the CRS of the first argument.

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.

getGeometryLibrary

final Geometries<?> getGeometryLibrary()

Returns a handler for the library of geometric objects used by this expression.

Specified by:

getGeometryLibrary in class SpatialFunction<R>

Returns:

the geometry library (never null).

See Also:

• Node.getGeometryLibrary(Expression)

getParameters

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

Returns the sub-expressions that will be evaluated to provide the parameters to the function.

Returns:

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

apply

public Object apply(R input)

Evaluates the two first expressions as geometry objects, applies the operation and returns the result.

Parameters:

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

Returns:

value computed by the expression.