netcharts.pro.datamodel
Class NFDataModelStock

java.lang.Object
  netcharts.pro.datamodel.NFDataModelStock

All Implemented Interfaces:

NFDataModel

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

This abstract class should be used to provide an interface for stock data sets (open, low, high, close) from an underlying data object. The underlying data object is passed into the constructor, and then is accessible directly in order to support get[price] and getNumPoints() method calls. An example is shown here:

 Object datao[][] = makeData();

 NFDataModelStock foodata = new NFDataModelStock(datao) {

     public Object getOpen(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][0];
     }
     public Object getLow(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][2];
     }
     public Object getHigh(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][3];
     }
     public Object getClose(int row) {
         Object o[][] = (Object[][])dataObject;
         return o[row][4];
     }
     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

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

NFDataModelStock(java.lang.Object dataObject)
NFDataModelStock 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
abstract java.lang.Object	getClose(int row) Return the Close price value corresponding to this row.
int	getDataDimensions() Return the number of data dimensions
abstract java.lang.Object	getHigh(int row) Return the High price value corresponding to this row.
abstract java.lang.Object	getLow(int row) Return the Low price value corresponding to this row.
int	getNRows() Used internally
abstract int	getNumPoints() Return the total number of points available in the data object
abstract java.lang.Object	getOpen(int row) Return the Open price 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

NFDataModelStock

public NFDataModelStock()

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

NFDataModelStock

public NFDataModelStock(java.lang.Object dataObject)

NFDataModelStock 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

getOpen

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

Return the Open price value corresponding to this row.

getClose

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

Return the Close price value corresponding to this row.

getHigh

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

Return the High price value corresponding to this row.

getLow

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

Return the Low price value corresponding to this row.

getNumPoints

public abstract int getNumPoints()

Return the total number of points 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