Data Binding MVC example

ClientsController.java

package br.com.caelum.mvc;

public class ClientsController {
	
	// reflection based conversion is NOT safe
	public void save1(Client client) {
		
	}
	
	// primitives are safe
	// no annotations required in java8
	public void save2(String name, int age) {
		
	}

	// primitives are safe
	// annotations required prior to java8
	public void save3(@Param int age, @Param String name) {
		
	}

	// primitives are safe
	public void save4(int i) {
		
	}
	
	// white listing is safe
	public void save5(Form form) {
		form = form.keep("name", "age");
		String name = form.extract("name");
	}

	// white listing with converters is safe
	public void save6(Form form) {
		form = form.keep("name", "age")
				   .with(new IntConverter());
		String name = form.extract("name");
	}

	// white listed reflection construction is safe
	public void save7(Form form) {
		// early setting, good citizen
		Client constructed = form.keep("name", "age").create(Client.class);
	}

	// white listed reflection setting is safe
	public void save8(Form form) {
		// late setting, either via setters or (ugh!) accessing private fields
		Client set = form.keep("name", "age").fill(new Client());
	}

}