Examples of java.util.Collection.retainAll()

java.util.Collection.retainAll()
Retains only the elements in this collection that are contained in the specified collection (optional operation). In other words, removes from this collection all of its elements that are not contained in the specified collection. @param c collection containing elements to be retained in this collection @return true if this collection changed as a result of the call @throws UnsupportedOperationException if the retainAll operationis not supported by this collection @throws ClassCastException if the types of one or more elementsin this collection are incompatible with the specified collection (optional) @throws NullPointerException if this collection contains one or morenull elements and the specified collection does not permit null elements (optional), or if the specified collection is null @see #remove(Object) @see #contains(Object)

                        Object oa = ((ObjectToken) a).getValue();
                        Object ob = ((ObjectToken) b).getValue();


                        if (oa instanceof Set && ob instanceof Collection) {
                            Set result = new HashSet((Set) oa);
                            result.retainAll((Collection) ob);
                            return new ObjectToken(result);
                        } else {
                            throw new InterpreterException(
                                    "Unknown object types: expected Set and Collection.");
                        }

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                             "throws expected exception " + ex);
        }
        
        // method retainAll
        try {
            result.retainAll(instance5Collection);
            fail(ASSERTION_FAILED,
                 "Method retainAll called on a query result show throw " + 
                 "UnsupportedOperationException"); 
        }
        catch (UnsupportedOperationException ex) {

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                             "throws expected exception " + ex);
        }
        
        // method retainAll
        try {
            result.retainAll(instance5Collection);
            fail(ASSERTION_FAILED,
                 "Method retainAll called on a query result show throw " + 
                 "UnsupportedOperationException"); 
        }
        catch (UnsupportedOperationException ex) {

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        pw.println(outIn.format(names));
        showSetNames(pw, temp);


        temp.clear();
        temp.addAll(set1);
        temp.retainAll(set2);
        pw.println();
        pw.println(inIn.format(names));
        showSetNames(pw, temp);
    }

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      final IJavaElement elem = (IJavaElement) it.next();
      if (elem.getElementType() == IJavaElement.FIELD)
        ret.add(elem);
    }


    ret.retainAll(this.fieldsToRefactor);
    return ret;
  }


  private String getFullyQualifiedName(IJavaElement elem) {
    // Get the associated set.

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        Collection picked = vv.getPickedVertexState().getPicked();
        if(picked.size() == 2) {
          Pair pair = new Pair(picked);
          Graph graph = layout.getGraph();
          Collection edges = new HashSet(graph.getIncidentEdges(pair.getFirst()));
          edges.retainAll(graph.getIncidentEdges(pair.getSecond()));
          exclusions.addAll(edges);
          vv.repaint();
        }
        
      }});

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        Collection picked = vv.getPickedVertexState().getPicked();
        if(picked.size() == 2) {
          Pair pair = new Pair(picked);
          Graph graph = layout.getGraph();
          Collection edges = new HashSet(graph.getIncidentEdges(pair.getFirst()));
          edges.retainAll(graph.getIncidentEdges(pair.getSecond()));
          exclusions.removeAll(edges);
          vv.repaint();
        }
        
      }});

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        Collection picked = vv.getPickedVertexState().getPicked();
        if(picked.size() == 2) {
          Pair pair = new Pair(picked);
          Graph graph = layout.getGraph();
          Collection edges = new HashSet(graph.getIncidentEdges(pair.getFirst()));
          edges.retainAll(graph.getIncidentEdges(pair.getSecond()));
          exclusions.addAll(edges);
          vv.repaint();
        }
        
      }});

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        Collection picked = vv.getPickedVertexState().getPicked();
        if(picked.size() == 2) {
          Pair pair = new Pair(picked);
          Graph graph = layout.getGraph();
          Collection edges = new HashSet(graph.getIncidentEdges(pair.getFirst()));
          edges.retainAll(graph.getIncidentEdges(pair.getSecond()));
          exclusions.removeAll(edges);
          vv.repaint();
        }
        
      }});

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    "contains", 
    "any", };
  
  boolean dumbHasRelation(Collection A, int filter, Collection B) {
    Collection ab = new TreeSet(A);
    ab.retainAll(B);
    if (ab.size() > 0 && (filter & SortedSetRelation.A_AND_B) == 0) return false; 
    
    // A - B size == A.size - A&B.size
    if (A.size() > ab.size() && (filter & SortedSetRelation.A_NOT_B) == 0) return false;

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