JLINQ
Java Language Integrated Query.
.NET LINQ equivalent. Create LINQ queries in Java.
Projects:
| Name | Description |
|---|---|
| JLINQ | Contains core interfaces and default implementation for JLINQ queries. |
| [W.I.P.] JLINQ.Queryable | Contains core interfaces for executing JLINQ queries on data sources. |
| [W.I.P.] JLINQ.Queryable.MySQL | Contains query wrapper for MySQL database (MySqlQueryableJLinqWrapper). |
To be implemented LINQ methods:
- aggregate
- all
- any
- asIterable
- asNumbered (arithmetic operations - average, max, min, sum)
- asParallel (parallel operations)
- average
- cast
- concat
- contains
- count
- defaultIfEmpty
- distinct
- elementAt
- elementAtOrDefault
- empty
- except
- first
- firstOrDefault
- forEach
- groupBy
- groupJoin
- indexOf
- intersect
- join
- last
- lastOrDefault
- longCount
- max
- min
- orderBy
- orderByDescending
- range
- repeat
- replaceAt
- replaceMultiple
- reverse
- select
- selectMany
- sequenceEqual
- single
- singleOrDefault
- skip
- skipWhile
- sum
- take
- takeWhile
- thenBy
- thenByDescending
- toArray
- toList
- toLookup
- toMap
- toSet
- union
- where
- zip
TODO / FINISHED:
- Documentation !!!
- Add support for basic math operations for whole collection. (See: INumberedJLinqWrapper)
- Add handler for IQueryable.
- Add support for parallel operations. (See: IParallelJLinqWrapper)
Examples:
- Retrieve some data.
C#:
using System.Linq;
int count = myEnumerable.Where((customer) => customer.Age == 24).Count();Above example is equivalent with:
Java:
package jlinq; // Main package which contains all JLinq methods and classes.
// THERE ARE 2 WAYS OF USING JLINQ !!!
// In first method you can handle each method yourself using JLinq static methods.
Iterable<Customer> customersWithAge24Iterator = JLinq.where(customers, (customer) -> customer.age == 24);
List<Customer> customersWithAge24 = JLinq.toList(customersWithAge24Iterator);
int count = JLinq.count(customersWithAge24);
// In second method you can use wrapper for JLinq which will give you more freedom of using multiple method calls / streams:
// Where as constructor parameter you must specify the Iterable on which you want to use JLinq.
int wrapperCount = new JLinqWrapper<Customer>(customers).where((customer) -> customer.age == 24).count();