org.gvsig.fmap.geom.operation

Class GeometryOperation

java.lang.Object

org.gvsig.fmap.geom.operation.GeometryOperation

Direct Known Subclasses:

AggregateDraw, AggregateDrawInts, Area, Contains, Crosses, Disjoint, Draw, DrawInts, EnsureOrientation, Equals, Flip, FromJTS, FromJTS, FromPostGISEWKB, FromWKB, FromWKB, FromWKT, FromWKT, Intersects, IsCCW, Offset, Out, Overlaps, Perimeter, Perpendicular, PerpendicularPoint, PointDistance, PointGetAngle, ToJTS, ToJTS, ToOGCWKB, ToPostGISEWKB, Touches, ToWKB, ToWKBNative, ToWKT, ToWKT, UnitVector, Within, WriteGml2Operation

public abstract class GeometryOperation
extends Object

Every geometry operation that is registered dynamically must extend this class.
The following example shows how to implement and register a custom operation:

 public class MyOperation extends GeometryOperation {
 
   // Check GeometryManager for alternative methods to register an operation  
   public static final int CODE = 
     GeometryManager.getInstance()
        .registerGeometryOperation("MyOperation", new MyOperation(), geomType);
   
   public Object invoke(Geometry geom, GeometryOperationContext ctx) throws GeometryOperationException {
        // Operation logic goes here
   }     
   
   public int getOperationIndex() {
      return CODE;
   }
   
 }
 

Field Summary

Fields

Modifier and Type	Field and Description
static int	OPERATION_CONTAINS_CODE
static String	OPERATION_CONTAINS_NAME
static int	OPERATION_INTERSECTS_CODE
static String	OPERATION_INTERSECTS_NAME

Constructor Summary

Constructors

Constructor and Description
GeometryOperation()

Method Summary

Modifier and Type	Method and Description
abstract int	getOperationIndex() Returns the constant value that identifies this operation and that was obtained upon registering it.
abstract Object	invoke(Geometry geom, GeometryOperationContext ctx) Invokes this operation given the geometry and context

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

OPERATION_INTERSECTS_NAME

public static final String OPERATION_INTERSECTS_NAME

See Also:

Constant Field Values

OPERATION_CONTAINS_NAME

public static final String OPERATION_CONTAINS_NAME

See Also:

Constant Field Values

OPERATION_INTERSECTS_CODE

public static int OPERATION_INTERSECTS_CODE

OPERATION_CONTAINS_CODE

public static int OPERATION_CONTAINS_CODE

Constructor Detail

GeometryOperation

public GeometryOperation()

Method Detail

invoke

public abstract Object invoke(Geometry geom,
                              GeometryOperationContext ctx)
                       throws GeometryOperationException

Invokes this operation given the geometry and context

Parameters:

geom - Geometry to which apply this operation

ctx - Parameter container

Returns:

Place-holder object that may contain any specific return value.

Throws:

GeometryOperationException - The implementation is responsible to throw this exception when needed.

getOperationIndex

public abstract int getOperationIndex()

Returns the constant value that identifies this operation and that was obtained upon registering it.

Returns:

operation unique index