Package org.organicdesign.fp.oneOf
Class OneOf4<A,B,C,D>
- java.lang.Object
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- org.organicdesign.fp.oneOf.OneOf4<A,B,C,D>
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
equals(Object other)
int
hashCode()
<R> R
match(Fn1<A,R> fa, Fn1<B,R> fb, Fn1<C,R> fc, Fn1<D,R> fd)
Languages that have union types built in have a match statement that works like this method.String
toString()
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Constructor Detail
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OneOf4
protected OneOf4(Object o, Class<A> aClass, Class<B> bClass, Class<C> cClass, Class<D> dClass, int index)
Protected constructor for subclassing.- Parameters:
o
- the item (may be null)aClass
- class 0 (to have at runtime for descriptive error messages and toString()).bClass
- class 1 (to have at runtime for descriptive error messages and toString()).cClass
- class 2 (to have at runtime for descriptive error messages and toString()).dClass
- class 3 (to have at runtime for descriptive error messages and toString()).index
- 0 means this represents an A, 1 represents a B, 2 represents a C, 3 means D
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Method Detail
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match
public <R> R match(Fn1<A,R> fa, Fn1<B,R> fb, Fn1<C,R> fc, Fn1<D,R> fd)
Languages that have union types built in have a match statement that works like this method. Exactly one of these functions will be executed - determined by which type of item this object holds.- Parameters:
fa
- the function to be executed if this OneOf stores the first type.fb
- the function to be executed if this OneOf stores the second type.fc
- the function to be executed if this OneOf stores the third type.fd
- the function to be executed if this OneOf stores the fourth type.- Returns:
- the return value of whichever function is executed.
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