org.geotools.grid
Class GridFeatureBuilder

Object
  extended by 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
static String DEFAULT_GEOMETRY_ATTRIBUTE_NAME
          Default name for the geometry attribute: "element"
 
Constructor Summary
GridFeatureBuilder(SimpleFeatureType type)
          Creates a GridFeatureBuilder to work with the given feature type.
 
Method Summary
 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


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