org.geotools.grid

Class GridFeatureBuilder

Object

GridFeatureBuilder

Direct Known Subclasses:

DefaultGridFeatureBuilder, OrthoLineFeatureBuilder

public abstract class GridFeatureBuilder
extends Object

Controls the creating of features representing grid elements during vector grid construction.

 GridFeatureBuilder builder = new GridFeatureBuilder(myFeatureType) {
     private int id = 0;

     public setAttributes(GridElement el, Map attributes) {
         // assumes "id" and "value" are valid property names for
         // the feature type
         attributes.put("id", ++id);
         attributes.put("value", myValueGettingFunction(el.toPolygon()));
     }
 };
 

Since:

2.7

Author:

mbedward

Field Summary

Fields

Modifier and Type	Field and Description
static String	DEFAULT_GEOMETRY_ATTRIBUTE_NAME Default name for the geometry attribute: "element"

Constructor Summary

Constructors

Constructor and Description
GridFeatureBuilder(SimpleFeatureType type) Creates a GridFeatureBuilder to work with the given feature type.

Method Summary

Modifier and Type	Method and Description
boolean	getCreateFeature(GridElement el) Tests whether a feature will be constructed for the given GridElement.
String	getFeatureID(GridElement el) Gets the FeatureID as a String for a new SimpleFeature being constructed from the given GridElement.
SimpleFeatureType	getType() Gets the feature type.
abstract void	setAttributes(GridElement el, Map<String,Object> attributes) Sets the values of attributes for a new SimpleFeature being constructed from the given GridElement.

Methods inherited from class Object

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

Field Detail

DEFAULT_GEOMETRY_ATTRIBUTE_NAME

public static final String DEFAULT_GEOMETRY_ATTRIBUTE_NAME

Default name for the geometry attribute: "element"

See Also:

Constant Field Values

Constructor Detail

GridFeatureBuilder

public GridFeatureBuilder(SimpleFeatureType type)

Creates a GridFeatureBuilder to work with the given feature type.

Parameters:

type - the feature type

Method Detail

getType

public SimpleFeatureType getType()

Gets the feature type.

Returns:

the feature type

setAttributes

public abstract void setAttributes(GridElement el,
                                   Map<String,Object> attributes)

Sets the values of attributes for a new SimpleFeature being constructed from the given GridElement.

This method must be overridden by the user. It is called by the grid building classes as each new feature is constructed.

Parameters:

el - the element from which the new feature is being constructed

attributes - a Map with attribute names as keys and attribute values as values

getFeatureID

public String getFeatureID(GridElement el)

Gets the FeatureID as a String for a new SimpleFeature being constructed from the given GridElement.

It is optional to override this method. The base implementation returns null.

Parameters:

el - the element from which the new feature is being constructed

Returns:

value to use as the feature ID

getCreateFeature

public boolean getCreateFeature(GridElement el)

Tests whether a feature will be constructed for the given GridElement. This can be overriden to create vector grids with 'holes' where elements are not required, for example, based on location or the relationship to other data layers.

The base implementation always returns true.

Parameters:

el - the element from which the new feature would be constructed

Returns:

true to create a feature for the element; false to skip the element