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

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


    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 string predicate.");
        } 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, stringPredicate());
            fail("Bag contains an element that should fail the predicate.");
        } 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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