Domain-Driven Design by Eric Evans

Author:Eric Evans
Language: eng
Format: epub
Publisher: Pearson Education Limited (US titles)
Published: 2004-03-18T05:00:00+00:00

Figure 10.6

Factoring out Pigment Color does communicate more than the earlier version, but the computation is the same, still in the mixIn() method. When we moved out the color data, we should have taken related behavior with it. Before we do, note that Pigment Color is a VALUE OBJECT. Therefore, it should be treated as immutable. When we mixed paint, the Paint object itself was changed. It was an ENTITY with an ongoing life story. In contrast, a Pigment Color representing a particular shade of yellow is always exactly that. Instead, mixing will result in a new Pigment Color object representing the new color.

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