LinqArraylist
loukaspd
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Data Structures

LinqArraylist

use Linq-like functions to Java ArrayLists

    implementation 'gr.loukaspd:LinqArraylist:1.0.0'

Android Arsenal

Usage

  1. Instantiate a LinqArrayList object by passing it your original ArrayList
  2. Apply linq methods (even chaining) like select, where etc..
  3. Get the resulting ArrayList by calling getArrayList() method

Examples

public static void main(String[] args) {
        ArrayList<SampleClass> myList = new ArrayList<>();
        myList.add(new SampleClass(1, "red"));
        myList.add(new SampleClass(2, "green"));
        myList.add(new SampleClass(3, "blue"));


        ArrayList<SampleClass> result = new LinqArrayList<>(myList)
                .where(new LinqArrayList.BooleanFunc<SampleClass>() {
                    @Override
                    public boolean lambda(SampleClass item) {
                        return item.id > 1;
                    }
                })
                .getArrayList();
        System.out.println(result);   //[2: green, 3: blue]

        System.out.println(new LinqArrayList<>(myList)
                .firstOrDefault(new LinqArrayList.BooleanFunc<SampleClass>() {
                    @Override
                    public boolean lambda(SampleClass item) {
                        return item.color.equals("red");
                    }
                }));    //1: red


        // chaining
        System.out.println(
                new LinqArrayList<>(myList)
                .where(new LinqArrayList.BooleanFunc<SampleClass>() {
                    @Override
                    public boolean lambda(SampleClass item) {
                        return item.id > 1;
                    }
                })
                .select(new LinqArrayList.SelectFunc<SampleClass, String>() {
                    @Override
                    public String lambda(SampleClass item) {
                        return item.color;
                    }
                })
                .getArrayList()
        );          //[green, blue]
    }

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