Design Patterns Explained

Figure 15-5 Setting up headers and footers to look like a report.
Chapter 15 • The Decorator Pattern 245
Figure 15-6 shows the application of Decorator to one header and
one footer.
Figure 15-6 An example Decorator object diagram.
The pattern
instantiated
Each Decorator object wraps its new function around its trailing How it works: object.
Each Decorator performs its added function either before its Decorators wrap decorated
function (for headers) or after it (for footers). The easiest their trailing object way to see
how it works is to look at code for a specific example and walk through it. See Example
15-1.