Sunday, July 8, 2007

Aggregation vs Composition


In normal terms, they both refer to member object but the survival or existence of the member object without the containing class or object or after the lifetime of the containing class or object makes the difference. Aggregation is also known as a 'has a' relationship because the containing object has a member object and the member object can survive or exist without the enclosing or containing class or can have a meaning after the lifetime of the enclosing object also.
Example ('has a'): Room has a table and the table can exist without the room. The table can have meaning without the room also.



Composition is also known as a 'is a part of' or 'is a' relationship because the member object is a part of the containing class and the member object cannot survive or exist outside the enclosing or containing class or doesnt have a meaning after the lifetime of the enclosing object. Composition is used over inheritance when different roles are to be played by a single entity. The 'is a' relation comes in this case.
Example 1 ('is a part of'): Computer Science Department is a part of the College. The Computer Science Department cannot exist without the college and the department has no meaning after the lifetime of the college.
Example 2 ('is a'): A Person is a supervisor. A Person is a husband. Supervisor and husband are the roles played by a single person. The husband role without the person has no meaning or cannot exist and similarly for the supervisor also.






From the above figure, Battery and Smart Phone explain Aggregation while the other relations explain Composition. The Smart Phone has a Battery. The Battery can exist without the Smart Phone and it has a meaning without the Smart Phone. On the other hand, the IMEI Number is a part of the Smart Phone and the existence of the IMEI number completely depends on the existence of the Smart Phone. The IMEI Number has no meaning without the Smart Phone. While the relation between IMEI Number and the Smart Phone explains the 'is a part of' type of composition, the other relation explains the 'is a' type of composition. The Smart Phone, in this case, plays roles at different times. The Smart Phone is a Camera. The Smart Phone is a Web Browser. The Smart Phone is a Music Player. The Music Player role of the Smart Phone cannot exist when the Smart Phone itself is not available.



Thus, Aggregation and Composition are almost the same conceptually but differ in implementation because, the contained or member object should be deleted in case of composition while the member object should not be deleted in case of aggregation.

111 comments:

Anonymous said...

Please correct the sentence below,

"Thus, Aggregation and Composition are almost the same conceptually implementation wise because..."

Antony Vincent Pandian.S. said...

Thanks a lot for pointing the mistake. Have made the correction.

Aanshi said...

well, what is inheritence then???
If dog "is-an" animal than means class dog can be inherited from class animal.

Unknown said...

Don't pay any attention to this document. It is really wrong and bad. "is part of" is not composition.

Antony Vincent Pandian.S. said...

@Chris,
good to see some opposition.

But put on your points on what is correct and why is this wrong so that everyone can know what is right and wrong. Just a statement that it is wrong wont do..

Daniel said...

Chris is right, this document is WRONG!

What is wrong:
"has-a" is both, aggregation and composition. The difference is not in this short two-word but in what you describe correctly about the livespan of an object.

"is-a" is always some form of inheritance, which is NEITHER an aggregation NOR a composition.

So please put this the right way.

Krishna said...

Daniel is correct,

IS-A is some form of inheritance.

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Sanjeewa said...

i think The Smart Phone has(not is) a Camera. The Smart Phone has(not is) a Web Browser. The Smart Phone has(not is) a Music Player.

Yash said...

The Article is really good for understanding the different.

It has some fundamental issues as Daniel rightly pointed our.

Please take his comments and update this blog.

Great going... keep posting!!!

Anonymous said...

maar li sab ne Antony bhai ki to......
antony kindly correct it now...

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Sharron Denice said...
This comment has been removed by the author.
Duc said...

Totally agreed with Daniel et al.

+ Inheritance: "is-a" relationship

+ Composition: "has-a" relationship

+ Aggregation: "owns-a" relationship

Whilst both Composition and Aggregation implies an object "has another object" , the Aggregation has more dependency than Composition, usually that's the live-cycle/concurrent-update .

Duc said...

Totally agreed with Daniel et al.

+ Inheritance: "is-a" relationship

+ Composition: "has-a" relationship

+ Aggregation: "owns-a" relationship

Whilst both Composition and Aggregation implies an object "has another object" , the Aggregation has more dependency than Composition, usually that's the live-cycle/concurrent-update .

Javi said...
This comment has been removed by the author.
Javi said...
This comment has been removed by the author.
Lalith said...

This is totally wrong.!!
Composition is 'has a' relation. That is the fundamental thing which was stated wrong.

Unknown said...

Composition and Aggregation are hotly debated topics and for the most part there isn't much of a consensus on how to define them.

Whether or not you can accurately describe them via has-a or is-a relationships I think for the most part we can agree that the lifetime analogy serves as a good distinction between the 2.

Unknown said...

The last statement tells the story in brief by looking at composition and aggregation in terms of life span.

Composition is quite easy to understand if we see the class is responsible for creation and destruction of the other related entity.

Anyone who is not been able to destroy the related entity upon self destruction can bring Aggregation to our mind.

Ankit Kashyap said...

a University can be seen as a composition of departments, whereas departments have an aggregation of professors.

VBAssassin said...

Litte confusing - i've always been told different to this:

"is a" = inheritance (such as dog is a animal)

"has a" = composition (such as phone has a screen or has a web browser)

"uses a" = aggregation (such as phone uses batteries)

John said...

"is a" is not composition. It represents an inheritance relationship i.e. subtyping.

Carlos Pineda said...

Is easy to understand when you think in terms of C++ language:

/* Composition */
class A
{
public:
class B
{
public:
int i;
}
x; /* "x" is a component of any instace of A */
};
void main()
{
A *a = new A();
a->x.i = 123;
delete(a); /* destroy the object referenced by "a" AND the component "x" */
}

/* Aggregation */
class B
{
public:
int i;
};
class A
{
public:
B *x; /* "x" is a reference to one object of type B */
};
void main()
{
A *a = new A();
B *b = new B();
a->x = b;
a->x->i = 0;
delete(a); /* destroy object referenced by "a" BUT NOT destroy the object referenced by "b" */
}

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This comment has been removed by the author.
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