Examples of org.apache.commons.collections.Bag

org.apache.commons.collections.Bag
Defines a collection that counts the number of times an object appears in the collection.
Suppose you have a Bag that contains {a, a, b, c}. Calling {@link #getCount(Object)} on a would return 2, whilecalling {@link #uniqueSet()} would return {a, b, c}.
NOTE: This interface violates the {@link Collection} contract. The behavior specified in many of these methods is not the same as the behavior specified by Collection. The noncompliant methods are clearly marked with "(Violation)". Exercise caution when using a bag as a Collection.
This violation resulted from the original specification of this interface. In an ideal world, the interface would be changed to fix the problems, however it has been decided to maintain backwards compatibility instead. @since Commons Collections 2.0 @version $Revision: 1.18 $ $Date: 2004/05/03 15:12:20 $ @author Chuck Burdick @author Stephen Colebourne

    }
    
    //--------------------------------------------------------------------------


    public void testlegalAddRemove() {
        Bag bag = makeTestBag();
        assertEquals(0, bag.size());
        Object[] els = new Object[] {"1", "3", "5", "7", "2", "4", "1"};
        for (int i = 0; i < els.length; i++) {
            bag.add(els[i]);
            assertEquals(i + 1, bag.size());
            assertEquals(true, bag.contains(els[i]));
        }
        Set set = ((PredicatedBag) bag).uniqueSet();
        assertTrue("Unique set contains the first element",set.contains(els[0]));
        assertEquals(true, bag.remove(els[0])); 
        set = ((PredicatedBag) bag).uniqueSet();
        assertTrue("Unique set now does not contain the first element",
            !set.contains(els[0])); 
    }

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        assertTrue("Unique set now does not contain the first element",
            !set.contains(els[0])); 
    }
 
    public void testIllegalAdd() {
        Bag bag = makeTestBag();
        Integer i = new Integer(3);
        try {
            bag.add(i);
            fail("Integer should fail type check.");
        } catch (IllegalArgumentException e) {
            // expected
        }
        assertTrue("Collection shouldn't contain illegal element", 
         !bag.contains(i));   
    }

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        elements.add("one");
        elements.add("two");
        elements.add(new Integer(3));
        elements.add("four");
        try {
            Bag bag = decorateBag(elements, stringClass);
            fail("Bag contains an element that should fail the type test.");
        } catch (IllegalArgumentException e) {
            // expected
        }
        try {
            Bag bag = decorateBag(new HashBag(), null);
            fail("Expectiing IllegalArgumentException for null predicate.");
        } catch (IllegalArgumentException e) {
            // expected
        }              
    }

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        bag.remove("A");
        assertEquals("Should have count of 0", 0, bag.getCount("A"));
    }


    public void testRemoveAll() {
        Bag bag = makeBag();
        bag.add("A", 2);
        assertEquals("Should have count of 2", 2, bag.getCount("A"));
        bag.add("B");
        bag.add("C");
        assertEquals("Should have count of 4", 4, bag.size());
        List delete = new ArrayList();
        delete.add("A");
        delete.add("B");
        bag.removeAll(delete);
        assertEquals("Should have count of 1", 1, bag.getCount("A"));
        assertEquals("Should have count of 0", 0, bag.getCount("B"));
        assertEquals("Should have count of 1", 1, bag.getCount("C"));
        assertEquals("Should have count of 2", 2, bag.size());
    }

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        assertEquals("Should have count of 1", 1, bag.getCount("C"));
        assertEquals("Should have count of 2", 2, bag.size());
    }
    
    public void testContains() {
        Bag bag = makeBag();
        
        assertEquals("Bag does not have at least 1 'A'", false, bag.contains("A"));
        assertEquals("Bag does not have at least 1 'B'", false, bag.contains("B"));
        
        bag.add("A");  // bag 1A
        assertEquals("Bag has at least 1 'A'", true, bag.contains("A"));
        assertEquals("Bag does not have at least 1 'B'", false, bag.contains("B"));
        
        bag.add("A");  // bag 2A
        assertEquals("Bag has at least 1 'A'", true, bag.contains("A"));
        assertEquals("Bag does not have at least 1 'B'", false, bag.contains("B"));
        
        bag.add("B");  // bag 2A,1B
        assertEquals("Bag has at least 1 'A'", true, bag.contains("A"));
        assertEquals("Bag has at least 1 'B'", true, bag.contains("B"));
    }

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        assertEquals("Bag has at least 1 'A'", true, bag.contains("A"));
        assertEquals("Bag has at least 1 'B'", true, bag.contains("B"));
    }


    public void testContainsAll() {
        Bag bag = makeBag();
        List known = new ArrayList();
        List known1A = new ArrayList();
        known1A.add("A");
        List known2A = new ArrayList();
        known2A.add("A");
        known2A.add("A");
        List known1B = new ArrayList();
        known1B.add("B");
        List known1A1B = new ArrayList();
        known1A1B.add("A");
        known1A1B.add("B");
        
        assertEquals("Bag containsAll of empty", true, bag.containsAll(known));
        assertEquals("Bag does not containsAll of 1 'A'", false, bag.containsAll(known1A));
        assertEquals("Bag does not containsAll of 2 'A'", false, bag.containsAll(known2A));
        assertEquals("Bag does not containsAll of 1 'B'", false, bag.containsAll(known1B));
        assertEquals("Bag does not containsAll of 1 'A' 1 'B'", false, bag.containsAll(known1A1B));
        
        bag.add("A");  // bag 1A
        assertEquals("Bag containsAll of empty", true, bag.containsAll(known));
        assertEquals("Bag containsAll of 1 'A'", true, bag.containsAll(known1A));
        assertEquals("Bag does not containsAll of 2 'A'", false, bag.containsAll(known2A));
        assertEquals("Bag does not containsAll of 1 'B'", false, bag.containsAll(known1B));
        assertEquals("Bag does not containsAll of 1 'A' 1 'B'", false, bag.containsAll(known1A1B));
        
        bag.add("A");  // bag 2A
        assertEquals("Bag containsAll of empty", true, bag.containsAll(known));
        assertEquals("Bag containsAll of 1 'A'", true, bag.containsAll(known1A));
        assertEquals("Bag containsAll of 2 'A'", true, bag.containsAll(known2A));
        assertEquals("Bag does not containsAll of 1 'B'", false, bag.containsAll(known1B));
        assertEquals("Bag does not containsAll of 1 'A' 1 'B'", false, bag.containsAll(known1A1B));
        
        bag.add("A");  // bag 3A
        assertEquals("Bag containsAll of empty", true, bag.containsAll(known));
        assertEquals("Bag containsAll of 1 'A'", true, bag.containsAll(known1A));
        assertEquals("Bag containsAll of 2 'A'", true, bag.containsAll(known2A));
        assertEquals("Bag does not containsAll of 1 'B'", false, bag.containsAll(known1B));
        assertEquals("Bag does not containsAll of 1 'A' 1 'B'", false, bag.containsAll(known1A1B));
        
        bag.add("B");  // bag 3A1B
        assertEquals("Bag containsAll of empty", true, bag.containsAll(known));
        assertEquals("Bag containsAll of 1 'A'", true, bag.containsAll(known1A));
        assertEquals("Bag containsAll of 2 'A'", true, bag.containsAll(known2A));
        assertEquals("Bag containsAll of 1 'B'", true, bag.containsAll(known1B));
        assertEquals("Bag containsAll of 1 'A' 1 'B'", true, bag.containsAll(known1A1B));
    }

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        assertEquals("Bag containsAll of 1 'B'", true, bag.containsAll(known1B));
        assertEquals("Bag containsAll of 1 'A' 1 'B'", true, bag.containsAll(known1A1B));
    }


    public void testSize() {
        Bag bag = makeBag();
        assertEquals("Should have 0 total items", 0, bag.size());
        bag.add("A");
        assertEquals("Should have 1 total items", 1, bag.size());
        bag.add("A");
        assertEquals("Should have 2 total items", 2, bag.size());
        bag.add("A");
        assertEquals("Should have 3 total items", 3, bag.size());
        bag.add("B");
        assertEquals("Should have 4 total items", 4, bag.size());
        bag.add("B");
        assertEquals("Should have 5 total items", 5, bag.size());
        bag.remove("A", 2);
        assertEquals("Should have 1 'A'", 1, bag.getCount("A"));
        assertEquals("Should have 3 total items", 3, bag.size());
        bag.remove("B");
        assertEquals("Should have 1 total item", 1, bag.size());
    }

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        bag.remove("B");
        assertEquals("Should have 1 total item", 1, bag.size());
    }
    
    public void testRetainAll() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        List retains = new ArrayList();
        retains.add("B");
        retains.add("C");
        bag.retainAll(retains);
        assertEquals("Should have 2 total items", 2, bag.size());
    }

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        bag.retainAll(retains);
        assertEquals("Should have 2 total items", 2, bag.size());
    }


    public void testIterator() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        assertEquals("Bag should have 3 items", 3, bag.size());
        Iterator i = bag.iterator();
    
        boolean foundA = false;
        while (i.hasNext()) {
            String element = (String) i.next();
            // ignore the first A, remove the second via Iterator.remove()
            if (element.equals("A")) {
                if (foundA == false) {
                    foundA = true;
                } else {
                    i.remove();
                }
            }
        }
    
        assertTrue("Bag should still contain 'A'", bag.contains("A"));
        assertEquals("Bag should have 2 items", 2, bag.size());
        assertEquals("Bag should have 1 'A'", 1, bag.getCount("A"));
    }

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        assertEquals("Bag should have 2 items", 2, bag.size());
        assertEquals("Bag should have 1 'A'", 1, bag.getCount("A"));
    }


    public void testIteratorFail() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        Iterator it = bag.iterator();
        it.next();
        bag.remove("A");
        try {
            it.next();
            fail("Should throw ConcurrentModificationException");
        } catch (ConcurrentModificationException e) {
            // expected

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