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1. A popular example of the Builder pattern is supplying a car with given characteristics. Suppose there is one car company that offers three models: economy, medium, and luxury. Write a nongeneric program that illustrates the pattern in this domain. The program should be able to handle different car models (products), and each model should offer different options for things such as wheels, upholstery, color, and air conditioning. 2. Use the Builder pattern to create a maze. The IBuilder interface should have methods such as BuildMaze, BuildRoom, BuildDoor, and GetMaze. Then create a StandardMazeBuilder and a DifficultMazeBuilder that implement the operations differently; for example, in the BuildRoom method, the StandardMaze could have two doors and the DifficultMaze between one and four doors. The client asks a director to create a maze builder of a given kind, and then to build the maze.

In our example, we export the chart to a PNG image file on our file system. The chart s filename is barchart3d.png, and will be created in the working directory for this Java application. The PNG image should load in most modern web browsers and image manipulation tools. The org.jfree.chart.ChartUtilities class provides methods for saving charts as JPEG or PNG images, writing JPEG or PNG to an input stream, and working with image maps:

Because ASP .NET is a true object-oriented development API, the page itself is an object that is accessible to the developer, as are the controls on the page (which are members of

The Builder and Abstract Factory patterns are similar in that they both look at construction at an abstract level. However, the Builder pattern is concerned with how a single object is made up by the different factories, whereas the Abstract Factory pattern is concerned with what products are made. The Builder pattern abstracts the algorithm for construction by including the concept of a director. The director is responsible for itemizing the steps and calls on builders to fulfill them. Directors do not have to conform to an interface.

public static void saveChartAsPNG(File file, JFreeChart chart, int width, int height) throws java.io.IOException

a collection within the page). Listing 3-11 shows the source code for a page containing several ASP .NET server controls.

The saveChartAsPNG() method we use in the SimpleChartDemo example creates a PNG image out of the chart with the width and height in pixels that we specified. The file does not have to exist before this method is called, and any existing files will be overwritten if the file system allows it.

A further elaboration on the theme of creating products is that instead of the client explicitly declaring fields of type ProductA and ProductB, say, the Product object the builder returns is actually a list of parts, which can have different lengths and contents depending on the director that was in charge at its creation. A comparison of the two patterns is given in Table 6-1.

You can execute this charting example from the command line. Your classpath will need to include the libraries distributed with JFreeChart. With JFreeChart 0.9.17, this would be jcommon-0.9.2.jar, jfreechart-0.9.17.jar, log4j-1.2.8.jar, and gnujaxp.jar.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Untitled Page</title> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="Label1" runat="server" Text="Welcome to my Page!"> </asp:Label> <asp:Panel ID="Panel1" runat="server" Height="168px" Width="286px"> This is a Panel Containing some Controls<br /> <br /> <asp:CheckBoxList ID="CheckBoxList1" runat="server"> <asp:ListItem>Item 1</asp:ListItem> <asp:ListItem>Item 2</asp:ListItem> <asp:ListItem>Item 3</asp:ListItem> </asp:CheckBoxList> <asp:Calendar ID="Calendar1" runat="server"></asp:Calendar> </asp:Panel> <asp:Panel ID="Panel2" runat="server" Height="50px" Width="435px"> This is another Panel containing some controls<br /> <asp:Button ID="Button1" runat="server" Text="Button" /> <asp:ListBox ID="ListBox1" runat="server"></asp:ListBox> <asp:Button ID="Button2" runat="server" Text="Button" /><br /> </asp:Panel> </div> </form> </body> </html>

Table 6-1. Comparison of Abstract Factory and Builder patterns Criteria Client aggregates Product creation is via Product creation invokes Factory/Builder returns Product has Abstract Factory A Factory and Products A factory CreateProductA A specific product Specific properties Builder A Director, Builders, and a Product A director Construct(builder) A part of a product A list of parts

package com.portalbook.charting; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartUtilities; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.CategoryDataset; import org.jfree.data.DefaultCategoryDataset; import java.io.*; public class SimpleChartDemo { protected CategoryDataset createChartData() { DefaultCategoryDataset dataset = new DefaultCategoryDataset(); dataset.addValue(1.3, "2004", "January"); dataset.addValue(2.6, "2004", "February"); dataset.addValue(4.6, "2004", "March"); return dataset; } protected JFreeChart createBarChart3D(CategoryDataset dataset) { String title = "Weather in Austin, Texas"; JFreeChart chart = ChartFactory.createBarChart3D( title, "Months in 2004", "Number of Sunny Days", dataset,

You can see how this looks in Design view in Figure 3-5.

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