org.locationtech.jts.geom.util

Class GeometryEditor

java.lang.Object

org.locationtech.jts.geom.util.GeometryEditor

public class GeometryEditor
extends Object

A class which supports creating new Geometrys which are modifications of existing ones, maintaining the same type structure. Geometry objects are intended to be treated as immutable. This class "modifies" Geometrys by traversing them, applying a user-defined GeometryEditor.GeometryEditorOperation, GeometryEditor.CoordinateSequenceOperation or GeometryEditor.CoordinateOperation and creating new Geometrys with the same structure but (possibly) modified components.

Examples of the kinds of modifications which can be made are:

• the values of the coordinates may be changed. The editor does not check whether changing coordinate values makes the result Geometry invalid
• the coordinate lists may be changed (e.g. by adding, deleting or modifying coordinates). The modified coordinate lists must be consistent with their original parent component (e.g. a LinearRing must always have at least 4 coordinates, and the first and last coordinate must be equal)
• components of the original geometry may be deleted (e.g. holes may be removed from a Polygon, or LineStrings removed from a MultiLineString). Deletions will be propagated up the component tree appropriately.

All changes must be consistent with the original Geometry's structure (e.g. a Polygon cannot be collapsed into a LineString). If changing the structure is required, use a GeometryTransformer.

This class supports creating an edited Geometry using a different GeometryFactory via the GeometryEditor(GeometryFactory) constructor. Examples of situations where this is required is if the geometry is transformed to a new SRID and/or a new PrecisionModel.

Usage Notes

• The resulting Geometry is not checked for validity. If validity needs to be enforced, the new Geometry's Geometry.isValid() method should be called.
• By default the UserData of the input geometry is not copied to the result.

Version:

1.7

See Also:

GeometryTransformer, Geometry.isValid()

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GeometryEditor.CoordinateOperation A GeometryEditor.GeometryEditorOperation which edits the coordinate list of a Geometry.
static class	GeometryEditor.CoordinateSequenceOperation A GeometryEditor.GeometryEditorOperation which edits the CoordinateSequence of a Geometry.
static interface	GeometryEditor.GeometryEditorOperation A interface which specifies an edit operation for Geometries.
static class	GeometryEditor.NoOpGeometryOperation A GeometryEditorOperation which does not modify the input geometry.

Constructor Summary

Constructors

Constructor and Description
GeometryEditor() Creates a new GeometryEditor object which will create edited Geometrys with the same GeometryFactory as the input Geometry.
GeometryEditor(GeometryFactory factory) Creates a new GeometryEditor object which will create edited Geometrys with the given GeometryFactory.

Method Summary

Modifier and Type	Method and Description
Geometry	edit(Geometry geometry, GeometryEditor.GeometryEditorOperation operation) Edit the input Geometry with the given edit operation.
void	setCopyUserData(boolean isUserDataCopied) Sets whether the User Data is copied to the edit result.

Methods inherited from class java.lang.Object

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

Constructor Detail

GeometryEditor

public GeometryEditor()

Creates a new GeometryEditor object which will create edited Geometrys with the same GeometryFactory as the input Geometry.

GeometryEditor

public GeometryEditor(GeometryFactory factory)

Creates a new GeometryEditor object which will create edited Geometrys with the given GeometryFactory.

Parameters:

factory - the GeometryFactory to create edited Geometrys with

Method Detail

setCopyUserData

public void setCopyUserData(boolean isUserDataCopied)

Sets whether the User Data is copied to the edit result. Only the object reference is copied.

Parameters:

isUserDataCopied - true if the input user data should be copied.

edit

public Geometry edit(Geometry geometry,
                     GeometryEditor.GeometryEditorOperation operation)

Edit the input Geometry with the given edit operation. Clients can create subclasses of GeometryEditor.GeometryEditorOperation or GeometryEditor.CoordinateOperation to perform required modifications.

Parameters:

geometry - the Geometry to edit

operation - the edit operation to carry out

Returns:

a new Geometry which is the result of the editing (which may be empty)