org.geotools.swing.tool

Class GridReaderLayerHelper

Object

InfoToolHelper

GridReaderLayerHelper

All Implemented Interfaces:

EventListener, MapBoundsListener

public class GridReaderLayerHelper
extends InfoToolHelper

Helper class used by InfoTool to query values in a GridReaderLayer.

Since:

8.0

Author:

Michael Bedward

Field Summary

Fields inherited from class InfoToolHelper

contentRef, KEY_POSITION, layerRef

Constructor Summary

Constructors

Constructor and Description
GridReaderLayerHelper()

Method Summary

Modifier and Type	Method and Description
InfoToolResult	getInfo(DirectPosition2D pos) Gets layer data at the specified position.
boolean	isSupportedLayer(Layer layer) CAlled by the helper lookup system when selecting a helper for a given layer.
boolean	isValid() Checks if this helper is holding a reference to a MapContent and a Layer.Helpers only hold a WeakReference to both the map content and layer to avoid blocking garbage collection when layers are discarded.
void	setLayer(Layer layer) Sets the map layer for this helper.

Methods inherited from class InfoToolHelper

clearTransform, getContentToLayerTransform, getLayer, getMapContent, isTransformRequired, mapBoundsChanged, setMapContent

Methods inherited from class Object

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

Constructor Detail

GridReaderLayerHelper

public GridReaderLayerHelper()

Method Detail

isSupportedLayer

public boolean isSupportedLayer(Layer layer)

Description copied from class: InfoToolHelper

CAlled by the helper lookup system when selecting a helper for a given layer.

Specified by:

isSupportedLayer in class InfoToolHelper

Parameters:

layer - the layer

Returns:

true is this helper can handle the layer

setLayer

public void setLayer(Layer layer)

Description copied from class: InfoToolHelper

Sets the map layer for this helper.

Overrides:

setLayer in class InfoToolHelper

Parameters:

layer - the map layer

isValid

public boolean isValid()

Description copied from class: InfoToolHelper

Checks if this helper is holding a reference to a MapContent and a Layer.Helpers only hold a WeakReference to both the map content and layer to avoid blocking garbage collection when layers are discarded.

Overrides:

isValid in class InfoToolHelper

Returns:

true if both map content and layer references are valid

getInfo

public InfoToolResult getInfo(DirectPosition2D pos)
                       throws Exception

Description copied from class: InfoToolHelper

Gets layer data at the specified position. If there are no feature data at the position, an empty InfoToolResult object is returned.

Specified by:

getInfo in class InfoToolHelper

Parameters:

pos - query position

Returns:

layer data

Throws:

Exception - on error querying the layer