netcharts.pro.datamodel
Class NFDataModel2D

java.lang.Object
  netcharts.pro.datamodel.NFDataModel2D

All Implemented Interfaces:

NFDataModel

public abstract class NFDataModel2D
extends java.lang.Object
implements NFDataModel

This abstract class should be used to provide an interface for 2 dimensional data sets (x/y sets) from an underlying data object. The underlying data object is passed into the constructor, and then is accessible directly in order to support get[dimension] and getNumPoints() method calls. An example is shown here:

 Object datao[][] = makeData();

 NFDataModel2D foodata = new NFDataModel2D(datao) {
     public Object getX(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][0];
     }
     public Object getY(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][1];
     }
     public int getNumPoints() {
         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

NFDataModel2D()
NFDataModel2D constructor that does not set the underlying data object.

NFDataModel2D(java.lang.Object dataObject)
NFDataModel2D 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
int	getNRows() Used internally
abstract int	getNumPoints() Return the total number of points available in the data object
abstract java.lang.Object	getX(int row) Return the X axis value corresponding to this row.
abstract java.lang.Object	getY(int row) Return the Y axis value corresponding to this row.
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

NFDataModel2D

public NFDataModel2D()

NFDataModel2D constructor that does not set the underlying data object. Used when the implementing class will not rely on the underlying data object after initialization.

NFDataModel2D

public NFDataModel2D(java.lang.Object dataObject)

NFDataModel2D 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

getX

public abstract java.lang.Object getX(int row)

Return the X axis value corresponding to this row.

getY

public abstract java.lang.Object getY(int row)

Return the Y axis value corresponding to this row.

getNumPoints

public abstract int getNumPoints()

Return the total number of points available in the data object

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

getDataDimensions

public int getDataDimensions()

Return the number of data dimensions

Specified by:

getDataDimensions 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