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My personal set of utils that I take along with my java projects.

There is a newer version: 0.1.0

package in.ashwanthkumar.utils.collections;

import in.ashwanthkumar.utils.func.Function;
import in.ashwanthkumar.utils.func.Predicate;
import in.ashwanthkumar.utils.lang.option.Option;
import in.ashwanthkumar.utils.lang.tuple.Tuple2;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import static in.ashwanthkumar.utils.lang.option.Option.option;

public class Iterables {
    public static  boolean exists(Iterable input, Predicate condition) {
        for (T data : input) {
            if (condition.apply(data)) return true;
        }
        return false;
    }

    public static  boolean forall(Iterable input, Predicate condition) {
        for (T data : input) {
            if (!condition.apply(data)) return false;
        }
        return true;
    }

    public static  T head(Iterable iterable) {
        return iterable.iterator().next();
    }

    public static  Option headOption(Iterable list) {
        Iterator iterator = list.iterator();
        if(iterator.hasNext()) return option(iterator.next());
        else return option(null);
    }

    public static  boolean isEmpty(Iterable list) {
        return list == null || !list.iterator().hasNext();
    }

    public static  boolean nonEmpty(Iterable list) {
        return !isEmpty(list);
    }

    public static  Map toMap(Iterable> tuples) {
        HashMap map = new HashMap();
        for (Tuple2 tuple : tuples) {
            map.put(tuple._1(), tuple._2());
        }
        return map;
    }

    public static  void foreach(Iterable input, Function condition) {
        for (T data : input) {
            condition.apply(data);
        }
    }

}