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

Class OneGeometry<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.OneGeometry<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:

OneGeometry.WithArgument

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

SQLMM spatial functions taking a single geometry operand. This base class assume that the geometry is the only parameter. Subclasses may add other kind of parameters.

Since:

1.1

Version:

1.3

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
(package private) static final class	OneGeometry.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>>	geometry	The expression giving the geometry.
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
OneGeometry(SQLMM operation, Expression<? super R,?>[] parameters, Geometries<G> library)	Creates a new function for a geometry represented by the given parameter.

Method Summary

Modifier and Type	Method	Description
Object	apply(R input)	Evaluates the first expression as a geometry object, 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<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

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

optimize

Field Details

serialVersionUID

private static final long serialVersionUID

For cross-version compatibility.

See Also:

• Constant Field Values

geometry

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

The expression giving the geometry.

Constructor Details

OneGeometry

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

Creates a new function for a geometry 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.

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 first expression as a geometry object, 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.