com.couchbase.lite.util.CollectionUtils Maven / Gradle / Ivy

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package com.couchbase.lite.util;

import java.util.ArrayList;
import java.util.Collection;

/**
 * Created by andy on 15/04/2014.
 */
public class CollectionUtils {

    public static  Collection filter(Collection target, Predicate predicate) {
        Collection result = new ArrayList();
        for (T element : target) {
            if (predicate.apply(element)) {
                result.add(element);
            }
        }
        return result;
    }

    public static  Collection transform(Collection target, Functor functor) {
        Collection result = new ArrayList();
        for (T element : target) {
            U mapped = functor.invoke(element);
            if (mapped != null) {
                result.add(mapped);
            }
        }
        return result;
    }

    public interface Predicate {
        boolean apply(T type);
    }

    public interface Functor {
        U invoke(T source);
    }
}