Collections

This project contains utility classes that can help build and manipulate Java collections.

BuilderMap

Map<Integer, String> map = new HashMap<>();
map.put(4, "four");
map.put(5, "five");
map.put(6, "six");

final Iterator<String> numbers = Arrays.asList("one", "two", "three").iterator();

Map<Integer, String> builderMap = new BuilderMap<>(new Builder<Entry<Integer, String>>() {

    private int i = 0;

    public Entry<Integer, String> build() {

        if (numbers.hasNext()) return new SimpleEntry<Integer, String>(++i, numbers.next());

        return null;
    }
}, map); // {1=one, 2=two, 3=three, 4=four, 5=five, 6=six}

BuilderCollection

Collection<String> collection = new Vector<>();
collection.add("one");
collection.add("two");
collection.add("three");

final Iterator<String> numbers = Arrays.asList("four", "five", "six").iterator();

Collection<String> builderCollection = new BuilderCollection<>(new Builder<String>() {

    private int i = 0;

    public String build() {

        if (numbers.hasNext()) return numbers.next();

        return null;
    }
}, collection); // [one, two, three, four, five, six]

BuilderSet

Set<String> set = new TreeSet<>();
set.add("one");
set.add("two");
set.add("three");

final Iterator<String> numbers = Arrays.asList("four", "five", "six").iterator();

Set<String> builderSet = new BuilderSet<>(new Builder<String>() {

    private int i = 0;

    public String build() {

        if (numbers.hasNext()) return numbers.next();

        return null;
    }
}, set); // [five, four, one, six, three, two]

BuilderList

List<String> list = new ArrayList<>();
list.add("one");
list.add("two");
list.add("three");

final Iterator<String> numbers = Arrays.asList("four", "five", "six").iterator();

List<String> builderList = new BuilderList<>(new Builder<String>() {

    private int i = 0;

    public String build() {

        if (numbers.hasNext()) return numbers.next();

        return null;
    }
}, list); // [one, two, three, four, five, six]