Product.java

package com.someaddress.model;

public class Product {

	// properties (already defined before)
 
	public Product() { }

	// getters ... (see? no setters)
	
	public void handleDetailsUpdate(DetailsUpdateIntent intent) {
		Assert.isTrue(intent.getPrice().compareTo(BigDecimal.ZERO) > 0);
		this.name = intent.getName();
		this.description = intent.getDescription();
		this.price = intent.getPrice();
	}
}