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Bug 367231

Summary:	[generate delegate][refactoring] Generate Decorator Class
Product:	[Eclipse Project] JDT	Reporter:	Nathan Reynolds <numeralnathan>
Component:	UI	Assignee:	JDT-UI-Inbox <jdt-ui-inbox>
Status:	RESOLVED WONTFIX	QA Contact:
Severity:	enhancement
Priority:	P3	CC:	deepakazad
Version:	3.8
Target Milestone:	---
Hardware:	PC
OS:	Windows 7
Whiteboard:

Description Nathan Reynolds

2011-12-20 13:03:26 EST

Build Identifier: 20110916-0149

I would like to be able to click on the Source menu and have a menu item say
"Generate Decorator Class".  This will popup a dialog box in which I enter
the name of my new class and the source class name.  The dialog box will have
other controls similar to that of creating a new class dialog box (where
applicable).  

When the user clicks okay in the dialog box it will create the new class.  
The new class will implement all of the same interfaces and methods as the
source class.  The new class constructor will accept a reference to the
source class.  All of the methods in the new class will simply forward the
call to the source class.

This functionality makes it easy to use the Decorator Pattern.  See http://en.wikipedia.org/wiki/Decorator_pattern for more information.

Reproducible: Always

Comment 1 Deepak Azad

2012-02-01 04:08:16 EST

You can do most of the heavy lifting already.

- Start with 
------------------------------------------------
interface MyInterface {
	void foo();
	void bar();
}
class Decorator {
	private MyInterface obj;
}
------------------------------------------------
- Select 'obj'
- Source > Generate delegate methods
- Select 'obj' again
- Source > Generate Constructor using fields

- Final result is 
------------------------------------------------
interface MyInterface {
	void foo();
	void bar();
}
class Decorator {
	private MyInterface obj;

	public Decorator(MyInterface obj) {
		super();
		this.obj = obj;
	}

	public void foo() {
		obj.foo();
	}

	public void bar() {
		obj.bar();
	}
}
------------------------------------------------

Closing as WONTFIX.