netcharts.pro.datamodel
Class NFDataModelDiagram

java.lang.Object
  netcharts.pro.datamodel.NFDataModelDiagram

All Implemented Interfaces:

NFDataModel

public abstract class NFDataModelDiagram
extends java.lang.Object
implements NFDataModel

This abstract class should be used to provide an interface for diagram data sets (nodes, edges) from an underlying data object. The underlying data object is passed into the constructor and then is accessible directly in order to support getNode, getNodeEdge, getNumRows() method calls. An example is shown here:

 Object datao[][] = makeData();

 NFDataModelDiagram foodata = new NFDataModelDiagram(datao) {
     public Object getNode(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][0];
     }
     public Object getNodeEdge(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][1];
     }
     public int getNumRows(int row) {
         return ((Object[])dataObject).length;
     }
 };
 

In the example above, the underlying data object is a multidimensional object array, but it could be a JDBC result set, DOM object, or other data object. This data may be passed to any instance of NFVector via the loadDataModel call.

Field Summary

java.lang.Object	dataObject Constructor provided data object.
boolean	hasMoreData Whether or not the model has more data.
java.lang.Object	userData Allows for information to be stored within the data model.

Constructor Summary

NFDataModelDiagram()
NFDataModelDiagram constructor that does not set the underlying data object.

NFDataModelDiagram(java.lang.Object dataObject)
NFDataModelDiagram constructor that sets the underlying data object.

Method Summary

java.lang.Object	elementAt(int rowIndex) Used internally
java.lang.Object	elementAt(int row, int col) Used internally
int	getDataDimensions() Return the number of data dimensions
abstract NFNode	getNode(int row) Return the node for this row
abstract NFNodeEdge	getNodeEdge(int row) Return the edge for this row
int	getNRows() Used internally
abstract int	getNumRows() Return the total number of rows available in the data object
boolean	hasMoreData() Returns whether or not there is more data.

Methods inherited from class java.lang.Object

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

Field Detail

dataObject

public java.lang.Object dataObject

Constructor provided data object.

hasMoreData

public boolean hasMoreData

Whether or not the model has more data.

userData

public java.lang.Object userData

Allows for information to be stored within the data model.

Constructor Detail

NFDataModelDiagram

public NFDataModelDiagram()

NFDataModelDiagram constructor that does not set the underlying data object. Used when the implementing class will not rely on the underlying data object after initialization.

NFDataModelDiagram

public NFDataModelDiagram(java.lang.Object dataObject)

NFDataModelDiagram constructor that sets the underlying data object. Used when the implementing class will rely on the underlying data object after initialization to retrieve the values.

Parameters:

dataObject -

Method Detail

getNode

public abstract NFNode getNode(int row)

Return the node for this row

getNodeEdge

public abstract NFNodeEdge getNodeEdge(int row)

Return the edge for this row

getNumRows

public abstract int getNumRows()

Return the total number of rows available in the data object

getDataDimensions

public int getDataDimensions()

Return the number of data dimensions

Specified by:

getDataDimensions in interface NFDataModel

hasMoreData

public boolean hasMoreData()

Returns whether or not there is more data. This is necessary where the number of rows being returned does not correspond to the underlying data set.

Specified by:

hasMoreData in interface NFDataModel

elementAt

public final java.lang.Object elementAt(int rowIndex)

Used internally

Specified by:

elementAt in interface NFDataModel

elementAt

public final java.lang.Object elementAt(int row,
                                        int col)

Used internally

Specified by:

elementAt in interface NFDataModel

getNRows

public final int getNRows()

Used internally

Specified by:

getNRows in interface NFDataModel