Map range (min-max) to a single value and if a value is in a range return the value mapped in java

Question

I need to map different interval to different single value.
The interval is type long and formed by min and max. The value is a short. The intervals are not overlapped, but can be consecutive. I would like to look up if a value is contained in one interval and in positive case returning the value mapped to this interval. Otherwise return null.

For example:

Range => Value  
100-200 => 5  
500-800 => 50  
201-300 => 50

If I lookup for 150, I need to have 5 as result, for 554 50 and instead for 305 null.

Answer 1

如果第三方库是公平的游戏，那么这完全是Guava的TreeRangeMap所做的100％。