IlvMapDataSource (Perforce JViews 10.0 API)

java.lang.Object
- ilog.views.maps.datasource.IlvMapDataSource

All Implemented Interfaces:

IlvPersistentObject, Serializable

Direct Known Subclasses:

Ilv3DViewBoundsDataSource, IlvDefaultMapDataSource, IlvGraphicLayerDataSource, IlvHierarchicalDataSource, IlvShapeDataSource, IlvTiledRasterDataSource
```
public abstract class IlvMapDataSource
extends Object
implements IlvPersistentObject
```
An IlvMapDataSource wraps the map rendering process code into a single class. The data source produces an IlvMapLayer usable with IlvMapLayerTree. This class is the base class for all data sources. Specialized data sources are available for all JViews Maps cartographic formats as well as for terrain analysis and measuring tools. A data source uses an IlvMapReusableFeatureIterator to produce map features and can therefore be restarted. A typical data source is:
```
  IlvManager manager = ...;
  IlvMapDataSource reader = new IlvShapeDataSource(shapeFileName, true);
  reader.setManager(manager);
  reader.start();
 
```
Since:

JViews 7.5

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`protected IlvFeatureRenderer`	`renderer` The renderer used to produce `IlvGraphics`.
`protected boolean`	`usingGeodeticComputation` This flag indicates if this data source should use geodetic computation, that is, data line wrapping.

Constructor Summary

Constructors
Constructor and Description

IlvMapDataSource()
Constructs an empty data source.

IlvMapDataSource(IlvInputStream stream)
Reads an IlvMapDataSource from an IlvInputStream.

Constructors
Constructor and Description
`IlvMapDataSource()` Constructs an empty data source.
`IlvMapDataSource(IlvInputStream stream)` Reads an `IlvMapDataSource` from an `IlvInputStream`.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`addDataSourceListener(DataSourceListener listener)` Adds a data source listener.
`protected void`	`callListeners(DataSourceEvent event)` Calls the listener registered for this data source.
`protected IlvMapLayer`	`createInsertionLayer()` Creates the insertion layer.
`IlvGraphicLayerDataSource[]`	`getBackupDataSources()` Returns the backup data sources that are used if the original data source is absent, or if use of a backup data source is forced.
`IlvCoordinateSystem`	`getCoordinateSystem()` Retrieves the coordinate system of this data source.
`String`	`getDescription()` Returns a description of the data source.
`abstract IlvMapReusableFeatureIterator`	`getFeatureIterator()` Retrieves the feature iterator used by this data source.
`IlvFeatureRenderer`	`getFeatureRenderer()` Retrieves the renderer used by this data source to render the `IlvGraphic`.
`IlvMapLayer`	`getInsertionLayer()` Retrieves the insertion layer.
`IlvManager`	`getManager()` Retrieves the manager attached to this data source.
`protected IlvMapLayer`	`getMapLayer(IlvMapFeature feature)` Returns the `mapLayer` containing the specified `IlvMapFeature`.
`String`	`getName()` Retrieves the name of this data source.
`IlvMapDataSourceNode`	`getNode()` Retrieves the `TreeNode` for which this data source is the user object.
`String[]`	`getValidExtentions()` Retrieves the valid file name extensions of the files that this data source can read.
`boolean`	`hasInsertionLayer()` Returns `true`, if the `IlvMapLayer` insertion layer and the associated `IlvManagerLayer` have been created.
`void`	`initBackupDataSource()` Creates and initializes the internal backup data source that is used when the original source data is not available.
`protected void`	`initInsertionLayer(IlvMapLayer layer)` Initializes the insertion `IlvMapLayer` of this data source and inserts a new `IlvManagerLayer` in the specified `IlvMapLayer`.
`boolean`	`isAttachingAttributes()` Indicates if the data source is attaching attributes.
`boolean`	`isGrapherMode()` Returns `true` if the objects are created in grapher mode.
`boolean`	`isSaveBackupDataSources()` Returns whether backup data sources (if any) should be saved along with the map.
`protected boolean`	`isSourceDataAvailable()` Checks whether the source data this `IlvMapDataSource` is based on is available (file, database connection, url...).
`protected boolean`	`isUsingBackupDataSource()` Indicates whether this data source is using backup data, meaning the original data is not available, or that this use is being forced by a `setForceUsingBackupDataSource(boolean)` call.
`boolean`	`isUsingGeodeticComputation()` Returns the `usingGeodeticComputation`.
`void`	`mapIntersects(Rectangle2D region, IlvMapApplyObject applyObject)` Applies a function to all map features of the data source that intersect the specified rectangle.
`void`	`removeDataSourceListener(DataSourceListener listener)` Removes a data source listener.
`void`	`reset()` Resets the data source and prepares it for reloading.
`void`	`setAttachingAttributes(boolean attach)` Indicates to the data source if it should attach attributes to the `IlvGraphic` produced.
`void`	`setCoordinateSystem(IlvCoordinateSystem cs)` Sets the coordinate system of this data source.
`void`	`setDescription(String descr)` Sets the description of the data source.
`void`	`setFeatureRenderer(IlvFeatureRenderer rdr)` Sets the `IlvFeatureRenderer` used by the data source.
`void`	`setForceUsingBackupDataSource(boolean forceBackupUse)` Indicates if this `IlvMapDataSource` object should enforce being based on the the data embedded in the map.
`void`	`setGrapherMode(boolean value)` Sets the grapher mode value.
`void`	`setInsertionLayer(IlvMapLayer layer)` Sets the layer that the `IlvGraphic` is to be inserted into.
`void`	`setManager(IlvManager m)` Sets the manager of this data source.
`void`	`setName(String n)` Sets the name of this data source.
`void`	`setSaveBackupDataSources(boolean saveBackupDataSources)` Sets whether backup data sources (if any) should be saved along with the map.
`void`	`setValidExtentions(String[] extentions)` Sets the valid file name extentions of the files that this data source can read.
`void`	`start()` Starts this data source and initiates the rendering process.
`String`	`toString()` Returns the name of the data source.
`void`	`write(IlvOutputStream stream)` Writes an `IlvMapDataSource` to an `IlvOutputStream`.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Field Detail
  - renderer
```
protected IlvFeatureRenderer renderer
```
    The renderer used to produce IlvGraphics.
  - usingGeodeticComputation
```
protected boolean usingGeodeticComputation
```
    This flag indicates if this data source should use geodetic computation, that is, data line wrapping. This is normally set when starting the data source by looking into the manager preferences.
    
    Since:
    
    JViews 8.1
- Constructor Detail
  - IlvMapDataSource
```
public IlvMapDataSource()
```
    Constructs an empty data source.
  - IlvMapDataSource
```
public IlvMapDataSource(IlvInputStream stream)
                 throws IlvReadFileException
```
    Reads an IlvMapDataSource from an IlvInputStream.
    
    Parameters:
    
    stream - The stream to read from.
    
    Throws:
    
    IlvReadFileException
- Method Detail
  - write
```
public void write(IlvOutputStream stream)
           throws IOException
```
    Writes an IlvMapDataSource to an IlvOutputStream.
    
    Specified by:
    
    write in interface IlvPersistentObject
    
    Parameters:
    
    stream - The stream to write to.
    
    Throws:
    
    IOException
  - reset
```
public void reset()
```
    Resets the data source and prepares it for reloading.
  - isSourceDataAvailable
```
protected boolean isSourceDataAvailable()
```
    Checks whether the source data this IlvMapDataSource is based on is available (file, database connection, url...). A .ivl, JViews Maps file keeps references to the original sources the map was built from. It can happen that these sources are not available when opening the map, for example, when the map is transferred to another machine. This method checks that availability. In the case where these sources are not available, all operations that need them are performed from the data embedded in the map, but there is a risk of loosing information (when reprojecting for example). This method should be overridden by subclasses.
    
    Returns:
    
    Returns true, if the original source data is available.
    
    Since:
    
    JViews 8.0
  - setForceUsingBackupDataSource
```
public void setForceUsingBackupDataSource(boolean forceBackupUse)
```
    Indicates if this IlvMapDataSource object should enforce being based on the the data embedded in the map. This will prevent reloading the original data source (file, database, or .ivl).
    Note: there is a risk of loosing information. For example, when reprojecting.
    
    Parameters:
    
    forceBackupUse - Indicates whether the embedded data should be used even if the original data source is available.
    
    Since:
    
    JViews 8.1
    
    See Also:
    
    Note: If the map data is saved "theme only", backup data source information is obviously lost.
  - getBackupDataSources
```
public IlvGraphicLayerDataSource[] getBackupDataSources()
```
    Returns the backup data sources that are used if the original data source is absent, or if use of a backup data source is forced.
    
    Returns:
    
    The array of backup data sources that contains the embedded map data.
    
    Since:
    
    JViews 8.1
  - isUsingBackupDataSource
```
protected boolean isUsingBackupDataSource()
```
    Indicates whether this data source is using backup data, meaning the original data is not available, or that this use is being forced by a setForceUsingBackupDataSource(boolean) call.
    
    Returns:
    
    If true, a backup data source is being used.
    
    Since:
    
    JViews 8.8
  - initBackupDataSource
```
public void initBackupDataSource()
```
    Creates and initializes the internal backup data source that is used when the original source data is not available. This method is called on every IlvMapDataSource present in the .ivl map when it is opened.
    
    Since:
    
    JViews 8.0
  - getFeatureIterator
```
public abstract IlvMapReusableFeatureIterator getFeatureIterator()
```
    Retrieves the feature iterator used by this data source.
    
    Returns:
    
    The feature iterator.
  - getMapLayer
```
protected IlvMapLayer getMapLayer(IlvMapFeature feature)
```
    Returns the mapLayer containing the specified IlvMapFeature. Note: The feature passed is ignored in the default implementation, but may be used in subclasses.
    
    Parameters:
    
    feature - The specified IlvMapFeature.
    
    Returns:
    
    The corresponding map layer.
  - mapIntersects
```
public void mapIntersects(Rectangle2D region,
                          IlvMapApplyObject applyObject)
```
    Applies a function to all map features of the data source that intersect the specified rectangle.
    
    Parameters:
    
    region - The specified region.
    
    applyObject - The IlvMapApplyObject function to apply to the map features.
  - getFeatureRenderer
```
public IlvFeatureRenderer getFeatureRenderer()
                                      throws Exception
```
    Retrieves the renderer used by this data source to render the IlvGraphic.
    
    Returns:
    
    The IlvFeatureRenderer.
    
    Throws:
    
    Exception
  - setFeatureRenderer
```
public void setFeatureRenderer(IlvFeatureRenderer rdr)
```
    Sets the IlvFeatureRenderer used by the data source.
    
    Parameters:
    
    rdr - The IlvFeatureRenderer used by the data source.
  - setAttachingAttributes
```
public void setAttachingAttributes(boolean attach)
```
    Indicates to the data source if it should attach attributes to the IlvGraphic produced.
    
    Parameters:
    
    attach - Set to true, if the data source should attach attributes, otherwise false.
  - isAttachingAttributes
```
public boolean isAttachingAttributes()
```
    Indicates if the data source is attaching attributes.
    
    Returns:
    
    Returns true, if the data source is attaching attributes, otherwise false.
  - setInsertionLayer
```
public void setInsertionLayer(IlvMapLayer layer)
```
    Sets the layer that the IlvGraphic is to be inserted into. The old insertion layer, if any, is disposed of.
    
    Parameters:
    
    layer - The insertion layer.
  - hasInsertionLayer
```
public boolean hasInsertionLayer()
```
    Returns true, if the IlvMapLayer insertion layer and the associated IlvManagerLayer have been created.
    
    Returns:
    
    Returns true, if the IlvMapLayer insertion layer and the IlvManagerLayer have been created.
  - getInsertionLayer
```
public IlvMapLayer getInsertionLayer()
```
    Retrieves the insertion layer.
    
    Returns:
    
    The insertion layer.
  - createInsertionLayer
```
protected IlvMapLayer createInsertionLayer()
```
    Creates the insertion layer.
    
    Returns:
    
    The layer that is to become the insertion layer.
  - initInsertionLayer
```
protected void initInsertionLayer(IlvMapLayer layer)
```
    Initializes the insertion IlvMapLayer of this data source and inserts a new IlvManagerLayer in the specified IlvMapLayer.
    
    Parameters:
    
    layer - The IlvMapLayer to initialize.
  - setCoordinateSystem
```
public void setCoordinateSystem(IlvCoordinateSystem cs)
```
    Sets the coordinate system of this data source.
    
    Parameters:
    
    cs - The coordinate system of this data source.
  - getCoordinateSystem
```
public IlvCoordinateSystem getCoordinateSystem()
```
    Retrieves the coordinate system of this data source.
    
    Returns:
    
    The coordinate system of this data source.
  - setName
```
public void setName(String n)
```
    Sets the name of this data source.
    
    Parameters:
    
    n - The name of this data source.
  - getName
```
public String getName()
```
    Retrieves the name of this data source.
    
    Returns:
    
    The name of the data source.
  - toString
```
public String toString()
```
    Returns the name of the data source.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    
    The name of the data source.
  - getDescription
```
public String getDescription()
```
    Returns a description of the data source.
    
    Returns:
    
    The description of the data source.
  - setDescription
```
public void setDescription(String descr)
```
    Sets the description of the data source.
    
    Parameters:
    
    descr - The description of the data source.
  - start
```
public void start()
           throws Exception
```
    Starts this data source and initiates the rendering process. The map features are read from the reader and the graphic objects are rendered and inserted into the manager.
    
    Throws:
    
    Exception
  - isGrapherMode
```
public boolean isGrapherMode()
```
    Returns true if the objects are created in grapher mode.
    
    Returns:
    
    true if the interactors are in grapher mode. The default is false.
    
    Since:
    
    JViews 8.5
    
    See Also:
    
    setGrapherMode(boolean)
  - setGrapherMode
```
public void setGrapherMode(boolean value)
```
    Sets the grapher mode value. If true, created objects will be added to the grapher of the attached view with the IlvGrapher.addNode(IlvGraphic, boolean) method. If false, they will be added with the IlvManager.addObject(IlvGraphic, boolean).
    
    Parameters:
    
    value - The value to be set.
    
    Since:
    
    JViews 8.5
    
    See Also:
    
    isGrapherMode()
  - getManager
```
public IlvManager getManager()
```
    Retrieves the manager attached to this data source.
    
    Returns:
    
    The manager attached to this data source.
  - setManager
```
public void setManager(IlvManager m)
```
    Sets the manager of this data source.
    
    Parameters:
    
    m - The manager.
  - getNode
```
public IlvMapDataSourceNode getNode()
```
    Retrieves the TreeNode for which this data source is the user object.
    
    Returns:
    
    The IlvMapDataSourceNode.
  - getValidExtentions
```
public String[] getValidExtentions()
```
    Retrieves the valid file name extensions of the files that this data source can read.
    
    Returns:
    
    The valid file name extentions.
  - setValidExtentions
```
public void setValidExtentions(String[] extentions)
```
    Sets the valid file name extentions of the files that this data source can read.
    
    Parameters:
    
    extentions - The valid file name extentions.
  - isUsingGeodeticComputation
```
public boolean isUsingGeodeticComputation()
```
    Returns the usingGeodeticComputation.
    
    Returns:
    
    Returns the usingGeodeticComputation.
  - addDataSourceListener
```
public void addDataSourceListener(DataSourceListener listener)
```
    Adds a data source listener. The listener is called when the data source is fully loaded.
    
    Parameters:
    
    listener - The listener to add.
  - removeDataSourceListener
```
public void removeDataSourceListener(DataSourceListener listener)
```
    Removes a data source listener.
    
    Parameters:
    
    listener - The listener to remove.
  - callListeners
```
protected final void callListeners(DataSourceEvent event)
```
    Calls the listener registered for this data source.
    
    Parameters:
    
    event - The event passed to the called listeners.
  - isSaveBackupDataSources
```
public boolean isSaveBackupDataSources()
```
    Returns whether backup data sources (if any) should be saved along with the map.
    
    Returns:
    
    Returns true, if the backup data sources are to be saved.
    
    Since:
    
    JViews 8.0
  - setSaveBackupDataSources
```
public void setSaveBackupDataSources(boolean saveBackupDataSources)
```
    Sets whether backup data sources (if any) should be saved along with the map.
    
    Parameters:
    
    saveBackupDataSources - Set to true, if the backup data sources are to be saved.
    
    Since:
    
    JViews 8.0

Class IlvMapDataSource

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

renderer

usingGeodeticComputation

Constructor Detail

IlvMapDataSource

IlvMapDataSource

Method Detail

write

reset

isSourceDataAvailable

setForceUsingBackupDataSource

getBackupDataSources

isUsingBackupDataSource

initBackupDataSource

getFeatureIterator

getMapLayer

mapIntersects

getFeatureRenderer

setFeatureRenderer

setAttachingAttributes

isAttachingAttributes

setInsertionLayer

hasInsertionLayer

getInsertionLayer

createInsertionLayer

initInsertionLayer

setCoordinateSystem

getCoordinateSystem

setName

getName

toString

getDescription

setDescription

start

isGrapherMode

setGrapherMode

getManager

setManager

getNode

getValidExtentions

setValidExtentions

isUsingGeodeticComputation

addDataSourceListener

removeDataSourceListener

callListeners

isSaveBackupDataSources

setSaveBackupDataSources