@Test
    void testDefaultPolicy() throws Exception {
        MetadataGraphEdge res;

        res = policy.apply(e1, e2);
        assertEquals("1.1", res.getVersion(), "Wrong depth edge selected");

        res = policy.apply(e1, e3);
        assertEquals("1.2", res.getVersion(), "Wrong version edge selected");
    }

                    Object key = getPluginKey().apply(element);
                    master.put(key, element);
                }

                Map<Object, List<Plugin>> predecessors = new LinkedHashMap<>();
                List<Plugin> pending = new ArrayList<>();
                for (Plugin element : src) {
                    Object key = getPluginKey().apply(element);
                    Plugin existing = master.get(key);

            @Override
            public boolean hasNext() {
                return it.hasNext();
            }

            @Override
            public U next() {
                return mapper.apply(it.next());
            }
        };
    }

    @Override
    public int size() {
        return list.size();
    }

      of your accepting any such warranty or additional liability.

   END OF TERMS AND CONDITIONS

   APPENDIX: How to apply the Apache License to your work.

      To apply the Apache License to your work, attach the following
      boilerplate notice, with the fields enclosed by brackets "[]"
      replaced with your own identifying information. (Don't include

    public MappedList(List<V> list, Function<V, U> mapper) {
        this.list = list;
        this.mapper = mapper;
    }

    @Override
    public U get(int index) {
        return mapper.apply(list.get(index));
    }

    @Override
    public int size() {
        return list.size();
    }

Contribution of such Contributor, if any, in source code and object code form.
This patent license shall apply to the combination of the Contribution and
the Program if, at the time the Contribution is added by the Contributor,
such addition of the Contribution causes such combination to be covered by
the Licensed Patents. The patent license shall not apply to any other combinations
which include the Contribution. No hardware per se is licensed hereunder.

being redistributed by another party ("Redistributor") and different terms and conditions may
apply to your use of any object code in the Content.  Check the Redistributor's license that was
provided with the Content.  If no such license exists, contact the Redistributor.  Unless otherwise
indicated below, the terms and conditions of the EPL still apply to any source code in the Content

    private <T> List<T> injectList(List<T> list, Function<T, T> modifer) {
        List<T> newList = null;
        for (int i = 0; i < list.size(); i++) {
            T oldT = list.get(i);
            T newT = modifer.apply(oldT);
            if (newT != oldT) {
                if (newList == null) {
                    newList = new ArrayList<>(list);
                }
                newList.set(i, newT);
            }
        }

import java.util.Set;

/**
 * Filter to only retain objects in the given scope or better. This implementation allows the accumulation of multiple
 * scopes and their associated implied scopes, so that the user can filter apply a series of implication rules in a
 * single step. This should be a more efficient implementation of multiple standard {@link ScopeArtifactFilter}
 * instances ORed together.
 *
 */

     * Returns a new tree starting at this node, filtering the children.
     * Note that this node will not be filtered and only the children
     * and its descendant will be checked.
     *
     * @param filter the filter to apply
     * @return a new filtered graph
     */
    @Nonnull
    Node filter(@Nonnull Predicate<Node> filter);

    /**
     * Returns a string representation of this dependency node.
     *