> On Jan 29, 2017, at 9:24 PM, Gary Gregory <garydgreg...@gmail.com> wrote:
>
> I know someone would reply with some Java 8 lamba... but that will never be
> as easy to ready as a method name like isEmpty or hasSomething...
>
At my day job a bunch of folks got giddy over the new java 8 functionality and
ended up writing a ton of unreadable non-debugable code. So, I definitely agree
with this sentiment.
-Rob
> Gary
>
>> On Sat, Jan 28, 2017 at 2:33 PM, Matt Benson <gudnabr...@gmail.com> wrote:
>>
>> Like Bene, this feels a little off to me. Just for argument's sake, let's
>> look at:
>>
>> Optional.ofNullable(foo).map(Object::toString).filter(
>> StringUtils::isNotBlank).isPresent();
>>
>> Assuming you're on Java 8, of course. It's a bit long, but not horrible.
>> What about, in a Java 8-compatible version of [lang], an
>> Optionals/OptionalUtils class?
>>
>> public class OptionalUtils {
>>
>> public static Optional<String> toString(Object o) {
>> return map(o, Object::toString);
>> }
>>
>> static <T, R> Optional<R> map(T t, Function<? super T, ? extends R> fn) {
>> return Optional.ofNullable(t).map(fn);
>> }
>> }
>>
>> Then your test could be shortened to:
>>
>> OptionalUtils.toString(foo).filter(StringUtils::isNotBlank).isPresent();
>>
>> Just thinking "out loud",
>> Matt
>>
>> On Sat, Jan 28, 2017 at 11:08 AM, Gary Gregory <garydgreg...@gmail.com>
>> wrote:
>>
>>> If you look at the link Matt provided, that handles arrays and
>> collection,
>>> but not Object.toString()
>>>
>>> Gary
>>>
>>> On Jan 28, 2017 1:13 AM, "Benedikt Ritter" <brit...@apache.org> wrote:
>>>
>>>
>>>> Am 28.01.2017 um 02:53 schrieb Gary Gregory <garydgreg...@gmail.com>:
>>>>
>>>> The simplest examples I have on hand are instances of Path and URI
>> which
>>>> can be built with an empty string. I want to know if these are "empty".
>>> For
>>>> the app I am now on for example, a Path or null and "" should be
>> treated
>>>> the same. Same for a URI.
>>>
>>> I don’t think it is a good idea to define emptiness based on the return
>>> value of Object.toString(). Consider the following:
>>>
>>> isEmpty(null) -> true
>>> isEmpty(„“) -> true
>>> isEmpty(new URI(„“)) -> true
>>>
>>> But:
>>>
>>> isEmpty(Collections.emptyList()) -> false
>>> isEmpty(new int[0]) -> false
>>>
>>> This is because toString() has nothing to do with emptiness. For this
>>> reason I think it would be better to have explicitly typed method
>> overloads
>>> for the use cases you’re thinking about:
>>>
>>> boolean isEmpty(Path)
>>> boolean isEmpty(URI)
>>>
>>> I’m not sure whether this belong to [lang]. The first looks like it
>> belongs
>>> to [io] while the second would better fit into [net]…
>>>
>>> Benedikt
>>>
>>>>
>>>> Gary
>>>>
>>>>> On Fri, Jan 27, 2017 at 5:37 PM, Matt Sicker <boa...@gmail.com> wrote:
>>>>>
>>>>> That's an interesting use case, though I've never come across a
>>> toString()
>>>>> implementation that would be affected. Can you go into more detail?
>>>>>
>>>>> On 27 January 2017 at 16:04, Gary Gregory <garydgreg...@gmail.com>
>>> wrote:
>>>>>
>>>>>> _Like_ that except that our Log4j version does not do the case I
>> want:
>>>>>> object.toString().
>>>>>>
>>>>>> Gary
>>>>>>
>>>>>> On Fri, Jan 27, 2017 at 1:58 PM, Matt Sicker <boa...@gmail.com>
>> wrote:
>>>>>>
>>>>>>> Something like this?
>>>>>>>
>>>>>>> https://github.com/apache/logging-log4j2/blob/master/
>>>>>>> log4j-core/src/main/java/org/apache/logging/log4j/core/
>>>>>>> util/Assert.java#L43
>>>>>>>
>>>>>>> On 27 January 2017 at 15:54, Gary Gregory <garydgreg...@gmail.com>
>>>>>> wrote:
>>>>>>>
>>>>>>>> Hi All,
>>>>>>>>
>>>>>>>> There are certain kinds of objects, _descriptor_ kind of objects
>> that
>>>>>>> would
>>>>>>>> benefit from isEmpty semantics. These kind of objects can describe
>>>>>>> complex
>>>>>>>> command line arguments and other kind of configuration objects.
>>>>>>>>
>>>>>>>> I'd like to add with this pseudo code:
>>>>>>>>
>>>>>>>> boolean isEmpty(Object) {
>>>>>>>> return object == null ? true : isEmpty(object.toString());
>>>>>>>> }
>>>>>>>>
>>>>>>>> Thoughts?
>>>>>>>>
>>>>>>>> Same idea of isBlank(), isNotEmpty() and so on.
>>>>>>>>
>>>>>>>> Gary
>>>>>>>>
>>>>>>>> --
>>>>>>>> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
>>>>>>>> Java Persistence with Hibernate, Second Edition
>>>>>>>> <https://www.amazon.com/gp/product/1617290459/ref=as_li_
>>>>>>>> tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&
>>>>>>>> linkCode=as2&tag=garygregory-20&linkId=
>>>>> cadb800f39946ec62ea2b1af9fe6a2
>>>>>> b8>
>>>>>>>>
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>>>>>>>> Blog: http://garygregory.wordpress.com
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>>>>>>>> Tweet! http://twitter.com/GaryGregory
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> Matt Sicker <boa...@gmail.com>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
>>>>>> Java Persistence with Hibernate, Second Edition
>>>>>> <https://www.amazon.com/gp/product/1617290459/ref=as_li_
>>>>>> tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&
>>>>>> linkCode=as2&tag=garygregory-20&linkId=
>> cadb800f39946ec62ea2b1af9fe6a2
>>> b8>
>>>>>>
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>>>>>> 1617290459>
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>> 31ecd1f6b6d1eaf8886ac902a24de4
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>>>>>> Blog: http://garygregory.wordpress.com
>>>>>> Home: http://garygregory.com/
>>>>>> Tweet! http://twitter.com/GaryGregory
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Matt Sicker <boa...@gmail.com>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
>>>> Java Persistence with Hibernate, Second Edition
>>>> <https://www.amazon.com/gp/product/1617290459/ref=as_li_tl?
>>> ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&link
>>> Code=as2&tag=garygregory-20&linkId=cadb800f39946ec62ea2b1af9fe6a2b8>
>>>>
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>>>> Tweet! http://twitter.com/GaryGregory
>>>
>>>
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>>
>
>
>
> --
> E-Mail: garydgreg...@gmail.com | ggreg...@apache.org
> Java Persistence with Hibernate, Second Edition
> <https://www.amazon.com/gp/product/1617290459/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1617290459&linkCode=as2&tag=garygregory-20&linkId=cadb800f39946ec62ea2b1af9fe6a2b8>
>
> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=1617290459>
> JUnit in Action, Second Edition
> <https://www.amazon.com/gp/product/1935182021/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=1935182021&linkCode=as2&tag=garygregory-20&linkId=31ecd1f6b6d1eaf8886ac902a24de418%22>
>
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> <http:////ir-na.amazon-adsystem.com/e/ir?t=garygregory-20&l=am2&o=1&a=1935182951>
> Blog: http://garygregory.wordpress.com
> Home: http://garygregory.com/
> Tweet! http://twitter.com/GaryGregory
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