Generic Range Class

Often code has a bad smell,nbsp;then it gets time to replace customnbsp;lines by common patterns. Sometimes it even makes sense to even replace a single line of code by a class just wrapping that single line (which actually increases code size), if that makes readers better understand what the code does. Unfortunately often such patterns are publiclynbsp;known butnbsp;do not exist as ready to use classes in the JRE, sonbsp;one needs to write them again and again. To not make people having to type again and again, I typically uploadnbsp;mine tonbsp;the web, so everybody is free to share it. One example is the Range pattern (see Martin FOWLER#039;s web site for a deeper introduction to that pattern). The Range Pattern In short, a Range is something that is described by an upper and lower bound. Sometimes, a range is open, i. e. it only has one bound or even none at all. Typically, ranges are used to check single values against them, like Is my birthday while I am on holidays? (the holidays are a range described by the first and last date, thenbsp;birthday is a single date). Or, Is this car in the wanted price range (neither too crappy, i. e. cheap, nor too expensive)? (the price range is described by the lowest sensible price and the maximum amount you want to pay, the actual price of a specific car is a single price). So, a range is a pattern, and it is independent of t...

Date: January, 01 2011
Url: http://www.java.net/blog/mkarg/archive/2011/01/01/generic-ranget-class

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