Functional/Fluid Collection Handling

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I've done a simple prototype to implement a Queryable wrapper around the 
iterables to work with collections of data in a fluent and functional way.

For Example
With:
        List<TestElement> elements = ...;
        Predicate<TestElement> filter = new Predicate<TestElement>(){...};
        Function<TestElement> selector = new Function<TestElement,String>(){...};

One can use it:
        List<String> result =  Queryables.asQueryable(elements)
                                         .filter(filter)
                                         .transform(selector)
                                         .skip(10)
                                         .take(5)
                                         .toList();

A patch with my current state and tests is appended.
If it's usable, I can spend some more time in expanding it.
(Planned as next would be .orderBy()/.thenBy() support)

(PS: the toMap function from Issue 519 is used)

Original issue reported on code.google.com by nvoll...@gmail.com on 12 Jan 2011 at 5:49

• Merged into: #11

Attachments:

• Queryable.patch

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Attached the Java Source

Original comment by nvoll...@gmail.com on 12 Jan 2011 at 5:53

Attachments:

• Queryable.zip

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Thanks.  We actually already use a class like this internally, which we called 
FluentIterable, but we've never found a good name for it.  Queryable... doesn't 
convey much either.  See issue 11.

Original comment by kevinb@google.com on 12 Jan 2011 at 8:33

• Changed state: Duplicate

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Maybe your looking for http://code.google.com/p/functional-collections

Original comment by amer...@gmail.com on 12 Jan 2011 at 9:06

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This issue has been migrated to GitHub.

It can be found at https://github.com/google/guava/issues/<id>

Original comment by cgdecker@google.com on 1 Nov 2014 at 4:15

• Added labels: MigratedToGitHub

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Original comment by cgdecker@google.com on 3 Nov 2014 at 9:09

• Added labels: Restrict-AddIssueComment-Commit