Java classes

4.1. Overview

The report will display stock data. To demonstrate BIRT we use a Mock object for providing the data. The appendix demonstrates how to get real stock data via a Yahoo service.

4.2. Domain Model

Create package "sawan.modi.birt.stocks.model" and then the following class. This class will represent the domain model.

   
package sawan.modi.birt.stocks.model;

import java.util.Date;

/**
* Domain model for stock data
* @author Lars Vogel
*/

public class StockData {
 private Date date;
 private double open;
 private double high;
 private double low;
 private double close;
 private long volume;

 public double getClose() {
  return close;
 }

 public void setClose(double close) {
  this.close = close;
 }

 public Date getDate() {
  return date;
 }

 public void setDate(Date date) {
  this.date = date;
 }

 public double getHigh() {
  return high;
 }

 public void setHigh(double high) {
  this.high = high;
 }

 public double getLow() {
  return low;
 }

 public void setLow(double low) {
  this.low = low;
 }

 public double getOpen() {
  return open;
 }

 public void setOpen(double open) {
  this.open = open;
 }

 public long getVolume() {
  return volume;
 }

 public void setVolume(long volume) {
  this.volume = volume;
 }

}
  

4.3. Data Access Object - Mock

Create the package "sawan.modi.birt.stocks.daomock" and then the following class.

   
package sawan.modi.birt.stocks.daomock;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

import sawan.modi.birt.stocks.model.StockData;

public class StockDaoMock {

 public List getStockValues(String company) {
  // Ignore the company and always return the data
  // A real implementation would of course use the company string
  List history = new ArrayList();
  // We fake the values, we will return fake value for 01.01.2009 -
  // 31.01.2009
  double begin = 2.5;
  for (int i = 1; i <= 31; i++) {
   Calendar day = Calendar.getInstance();
   day.set(Calendar.HOUR, 0);
   day.set(Calendar.MINUTE, 0);
   day.set(Calendar.SECOND, 0);
   day.set(Calendar.MILLISECOND, 0);
   day.set(Calendar.YEAR, 2009);
   day.set(Calendar.MONTH, 0);
   day.set(Calendar.DAY_OF_MONTH, i);
   StockData data = new StockData();
   data.setOpen(begin);
   double close = Math.round(begin + Math.random() * begin * 0.1);
   data.setClose(close);
   data.setLow(Math.round(Math.min(begin, begin - Math.random() * begin * 0.1)));
   data.setHigh(Math.round(Math.max(begin, close) + Math.random() * 2));
   data.setVolume(1000 + (int) (Math.random() * 500));
   begin = close;
   data.setDate(day.getTime());
   history.add(data);
  }
  return history;
 }
}