Umple W010 Singleton Multiplicity Over 1
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W010 Singleton Multiplicity Over 1
Umple semantic warning reported when a singleton class has an association with incoming multiplicity > 1
Since there can only be one instance of a singleton class, it is logically impossible for another class to have links to more than one instance of the singleton class.
Example
// This example generates the warning message
class X {
singleton;
}
class Y {
0..1 -- * X;
}
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Solution to The Above So the Message No Longer Appears
// The following shows how to avoid the warning
class X {
singleton;
}
class Y {
0..1 -- 1 X;
}
Load the above code into UmpleOnline