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

        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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            // expected
        }
    }
    
    public void testIteratorFailNoMore() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        Iterator it = bag.iterator();
        it.next();
        it.next();
        it.next();
        try {
            it.next();

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            // expected
        }
    }
    
    public void testIteratorFailDoubleRemove() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        Iterator it = bag.iterator();
        it.next();
        it.next();
        assertEquals(3, bag.size());
        it.remove();
        assertEquals(2, bag.size());
        try {
            it.remove();
            fail("Should throw IllegalStateException");
        } catch (IllegalStateException ex) {
            // expected
        }
        assertEquals(2, bag.size());
        it.next();
        it.remove();
        assertEquals(1, bag.size());
    }

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        it.remove();
        assertEquals(1, bag.size());
    }
    
    public void testToArray() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        Object[] array = bag.toArray();
        int a = 0, b = 0, c = 0;
        for (int i = 0; i < array.length; i++) {
            a += (array[i].equals("A") ? 1 : 0);
            b += (array[i].equals("B") ? 1 : 0);
            c += (array[i].equals("C") ? 1 : 0);

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        assertEquals(2, b);
        assertEquals(1, c);
    }


    public void testToArrayPopulate() {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        String[] array = (String[]) bag.toArray(new String[0]);
        int a = 0, b = 0, c = 0;
        for (int i = 0; i < array.length; i++) {
            a += (array[i].equals("A") ? 1 : 0);
            b += (array[i].equals("B") ? 1 : 0);
            c += (array[i].equals("C") ? 1 : 0);

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        assertEquals(1, c);
    }


    //-----------------------------------------------------------------------
    public void testEquals() {
        Bag bag = makeBag();
        Bag bag2 = makeBag();
        assertEquals(true, bag.equals(bag2));
        bag.add("A");
        assertEquals(false, bag.equals(bag2));
        bag2.add("A");
        assertEquals(true, bag.equals(bag2));
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        bag2.add("A");
        bag2.add("B");
        bag2.add("B");
        bag2.add("C");
        assertEquals(true, bag.equals(bag2));
    }

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        bag2.add("C");
        assertEquals(true, bag.equals(bag2));
    }


    public void testEqualsHashBag() {
        Bag bag = makeBag();
        Bag bag2 = new HashBag();
        assertEquals(true, bag.equals(bag2));
        bag.add("A");
        assertEquals(false, bag.equals(bag2));
        bag2.add("A");
        assertEquals(true, bag.equals(bag2));
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        bag2.add("A");
        bag2.add("B");
        bag2.add("B");
        bag2.add("C");
        assertEquals(true, bag.equals(bag2));
    }

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        bag2.add("C");
        assertEquals(true, bag.equals(bag2));
    }


    public void testHashCode() {
        Bag bag = makeBag();
        Bag bag2 = makeBag();
        assertEquals(0, bag.hashCode());
        assertEquals(0, bag2.hashCode());
        assertEquals(bag.hashCode(), bag2.hashCode());
        bag.add("A");
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        bag2.add("A");
        bag2.add("A");
        bag2.add("B");
        bag2.add("B");
        bag2.add("C");
        assertEquals(bag.hashCode(), bag2.hashCode());
        
        int total = 0;
        total += ("A".hashCode() ^ 2);
        total += ("B".hashCode() ^ 2);
        total += ("C".hashCode() ^ 1);
        assertEquals(total, bag.hashCode());
        assertEquals(total, bag2.hashCode());
    }

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