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

        assertEquals(total, bag2.hashCode());
    }


    //-----------------------------------------------------------------------
    public void testEmptyBagSerialization() throws IOException, ClassNotFoundException {
        Bag bag = makeBag();
        if (!(bag instanceof Serializable)) return;
        
        byte[] objekt = writeExternalFormToBytes((Serializable) bag);
        Bag bag2 = (Bag) readExternalFormFromBytes(objekt);


        assertEquals("Bag should be empty",0, bag.size());
        assertEquals("Bag should be empty",0, bag2.size());
    }

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        assertEquals("Bag should be empty",0, bag.size());
        assertEquals("Bag should be empty",0, bag2.size());
    }


    public void testFullBagSerialization() throws IOException, ClassNotFoundException {
        Bag bag = makeBag();
        bag.add("A");
        bag.add("A");
        bag.add("B");
        bag.add("B");
        bag.add("C");
        int size = bag.size();
        if (!(bag instanceof Serializable)) return;
        
        byte[] objekt = writeExternalFormToBytes((Serializable) bag);
        Bag bag2 = (Bag) readExternalFormFromBytes(objekt);


        assertEquals("Bag should be same size", size, bag.size());
        assertEquals("Bag should be same size", size, bag2.size());
    }

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        return makeBag();
    }


    //-----------------------------------------------------------------------
    public void testBagAdd() {
        Bag bag = makeBag();
        bag.add("A");
        assertTrue("Should contain 'A'", bag.contains("A"));
        assertEquals("Should have count of 1", 1, bag.getCount("A"));
        bag.add("A");
        assertTrue("Should contain 'A'", bag.contains("A"));
        assertEquals("Should have count of 2", 2, bag.getCount("A"));
        bag.add("B");
        assertTrue(bag.contains("A"));
        assertTrue(bag.contains("B"));
    }

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        assertTrue(bag.contains("A"));
        assertTrue(bag.contains("B"));
    }


    public void testBagEqualsSelf() {
        Bag bag = makeBag();
        assertTrue(bag.equals(bag));
        bag.add("elt");
        assertTrue(bag.equals(bag));
        bag.add("elt"); // again
        assertTrue(bag.equals(bag));
        bag.add("elt2");
        assertTrue(bag.equals(bag));
    }

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        bag.add("elt2");
        assertTrue(bag.equals(bag));
    }


    public void testRemove() {
        Bag bag = makeBag();
        bag.add("A");
        assertEquals("Should have count of 1", 1, bag.getCount("A"));
        bag.remove("A");
        assertEquals("Should have count of 0", 0, bag.getCount("A"));
        bag.add("A");
        bag.add("A");
        bag.add("A");
        bag.add("A");
        assertEquals("Should have count of 4", 4, bag.getCount("A"));
        bag.remove("A", 0);
        assertEquals("Should have count of 4", 4, bag.getCount("A"));
        bag.remove("A", 2);
        assertEquals("Should have count of 2", 2, bag.getCount("A"));
        bag.remove("A");
        assertEquals("Should have count of 0", 0, bag.getCount("A"));
    }

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


    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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     * @param other  the bag to retain
     * @return <code>true</code> if this call changed the collection
     */
    boolean retainAll(Bag other) {
        boolean result = false;
        Bag excess = new HashBag();
        Iterator i = uniqueSet().iterator();
        while (i.hasNext()) {
            Object current = i.next();
            int myCount = getCount(current);
            int otherCount = other.getCount(current);
            if (1 <= otherCount && otherCount <= myCount) {
                excess.add(current, myCount - otherCount);
            } else {
                excess.add(current, myCount);
            }
        }
        if (!excess.isEmpty()) {
            result = removeAll(excess);
        }
        return result;
    }

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