Examples of org.apache.commons.collections15.multimap.MultiHashMap

Package org.apache.commons.collections15.multimap

Examples of org.apache.commons.collections15.multimap.MultiHashMap

org.apache.commons.collections15.multimap.MultiHashMap
MultiHashMap is the default implementation of the {@link org.apache.commons.collections15.MultiMap MultiMap} interface.
A MultiMap is like a Map, but with slightly different semantics. Putting a value into the map will add the value to a Collection at that key. Getting a value will return a Collection, holding all the values put to that key.
This implementation uses an ArrayList as the collection. The internal storage list is made available without cloning via the get(Object) and entrySet() methods. The implementation returns null when there are no values mapped to a key.
For example:
```
 Number key = new Integer(5); MultiMap<Number,String> mhm = new MultiHashMap<Number,String>(); mhm.put(key, "A"); mhm.put(key, "B"); mhm.put(key, "C"); Collection<String> coll = mhm.get(key);
```
list will be a list containing "A", "B", "C". @author Christopher Berry @author James Strachan @author Steve Downey @author Stephen Colebourne @author Julien Buret @author Matt Hall, John Watkinson, Serhiy Yevtushenko @version $Revision: 1.2 $ $Date: 2006/06/08 15:19:55 $ @since Commons Collections 2.0


    public void testMapRemove() {
    }


    public void testMapEquals() {
        MultiHashMap one = new MultiHashMap();
        Integer value = new Integer(1);
        one.put("One", value);
        one.remove("One", value);


        MultiHashMap two = new MultiHashMap();
        assertEquals(two, one);
    }

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        super.verifyValues();
    }


    //-----------------------------------------------------------------------
    public void testGetCollection() {
        MultiHashMap map = new MultiHashMap();
        map.put("A", "AA");
        assertSame(map.get("A"), map.getCollection("A"));
    }

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        map.put("A", "AA");
        assertSame(map.get("A"), map.getCollection("A"));
    }


    public void testTotalSize() {
        MultiHashMap map = new MultiHashMap();
        assertEquals(0, map.totalSize());
        map.put("A", "AA");
        assertEquals(1, map.totalSize());
        map.put("B", "BA");
        assertEquals(2, map.totalSize());
        map.put("B", "BB");
        assertEquals(3, map.totalSize());
        map.put("B", "BC");
        assertEquals(4, map.totalSize());
        map.remove("A");
        assertEquals(3, map.totalSize());
        map.remove("B", "BC");
        assertEquals(2, map.totalSize());
    }

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        map.remove("B", "BC");
        assertEquals(2, map.totalSize());
    }


    public void testSize_Key() {
        MultiHashMap map = new MultiHashMap();
        assertEquals(0, map.size("A"));
        assertEquals(0, map.size("B"));
        map.put("A", "AA");
        assertEquals(1, map.size("A"));
        assertEquals(0, map.size("B"));
        map.put("B", "BA");
        assertEquals(1, map.size("A"));
        assertEquals(1, map.size("B"));
        map.put("B", "BB");
        assertEquals(1, map.size("A"));
        assertEquals(2, map.size("B"));
        map.put("B", "BC");
        assertEquals(1, map.size("A"));
        assertEquals(3, map.size("B"));
        map.remove("A");
        assertEquals(0, map.size("A"));
        assertEquals(3, map.size("B"));
        map.remove("B", "BC");
        assertEquals(0, map.size("A"));
        assertEquals(2, map.size("B"));
    }

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        assertEquals(0, map.size("A"));
        assertEquals(2, map.size("B"));
    }


    public void testIterator_Key() {
        MultiHashMap map = new MultiHashMap();
        assertEquals(false, map.iterator("A").hasNext());
        map.put("A", "AA");
        Iterator it = map.iterator("A");
        assertEquals(true, it.hasNext());
        it.next();
        assertEquals(false, it.hasNext());
    }

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        it.next();
        assertEquals(false, it.hasNext());
    }


    public void testContainsValue_Key() {
        MultiHashMap map = new MultiHashMap();
        assertEquals(false, map.containsValue("A", "AA"));
        assertEquals(false, map.containsValue("B", "BB"));
        map.put("A", "AA");
        assertEquals(true, map.containsValue("A", "AA"));
        assertEquals(false, map.containsValue("A", "AB"));
    }

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        assertEquals(true, map.containsValue("A", "AA"));
        assertEquals(false, map.containsValue("A", "AB"));
    }


    public void testPutAll_KeyCollection() {
        MultiHashMap map = new MultiHashMap();
        Collection coll = Arrays.asList(new Object[]{"X", "Y", "Z"});


        assertEquals(true, map.putAll("A", coll));
        assertEquals(3, map.size("A"));
        assertEquals(true, map.containsValue("A", "X"));
        assertEquals(true, map.containsValue("A", "Y"));
        assertEquals(true, map.containsValue("A", "Z"));


        assertEquals(false, map.putAll("A", null));
        assertEquals(3, map.size("A"));
        assertEquals(true, map.containsValue("A", "X"));
        assertEquals(true, map.containsValue("A", "Y"));
        assertEquals(true, map.containsValue("A", "Z"));


        assertEquals(false, map.putAll("A", new ArrayList()));
        assertEquals(3, map.size("A"));
        assertEquals(true, map.containsValue("A", "X"));
        assertEquals(true, map.containsValue("A", "Y"));
        assertEquals(true, map.containsValue("A", "Z"));


        coll = Arrays.asList(new Object[]{"M"});
        assertEquals(true, map.putAll("A", coll));
        assertEquals(4, map.size("A"));
        assertEquals(true, map.containsValue("A", "X"));
        assertEquals(true, map.containsValue("A", "Y"));
        assertEquals(true, map.containsValue("A", "Z"));
        assertEquals(true, map.containsValue("A", "M"));
    }

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        assertEquals(true, map.containsValue("A", "Z"));
        assertEquals(true, map.containsValue("A", "M"));
    }


    public void testClone() {
        MultiHashMap map = new MultiHashMap();
        map.put("A", "1");
        map.put("A", "2");
        Collection coll = (Collection) map.get("A");
        assertEquals(1, map.size());
        assertEquals(2, coll.size());


        MultiHashMap cloned = (MultiHashMap) map.clone();
        Collection clonedColl = (Collection) cloned.get("A");
        assertNotSame(map, cloned);
        assertNotSame(coll, clonedColl);
        assertEquals(1, map.size());
        assertEquals(2, coll.size());
        assertEquals(1, cloned.size());
        assertEquals(2, clonedColl.size());
        map.put("A", "3");
        assertEquals(1, map.size());
        assertEquals(3, coll.size());
        assertEquals(1, cloned.size());
        assertEquals(2, clonedColl.size());
    }

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        assertEquals(1, cloned.size());
        assertEquals(2, clonedColl.size());
    }


    public void testConstructorCopy1() {
        MultiHashMap map = new MultiHashMap();
        map.put("A", "1");
        map.put("A", "2");
        Collection coll = (Collection) map.get("A");
        assertEquals(1, map.size());
        assertEquals(2, coll.size());


        MultiHashMap newMap = new MultiHashMap(map);
        Collection newColl = (Collection) newMap.get("A");
        assertNotSame(map, newMap);
        assertNotSame(coll, newColl);
        assertEquals(1, map.size());
        assertEquals(2, coll.size());
        assertEquals(1, newMap.size());
        assertEquals(2, newColl.size());


        map.put("A", "3");
        assertEquals(1, map.size());
        assertEquals(3, coll.size());
        assertEquals(1, newMap.size());
        assertEquals(2, newColl.size());
    }

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        Map map = new HashMap();
        map.put("A", "1");
        map.put("B", "2");
        assertEquals(2, map.size());


        MultiHashMap newMap = new MultiHashMap(map);
        Collection newColl = (Collection) newMap.get("A");
        assertNotSame(map, newMap);
        assertEquals(2, map.size());
        assertEquals(2, newMap.size());
        assertEquals(1, newColl.size());


        map.put("A", "3");
        assertEquals(2, map.size());
        assertEquals(2, newMap.size());
        assertEquals(1, newColl.size());


        map.put("C", "4");
        assertEquals(3, map.size());
        assertEquals(2, newMap.size());
        assertEquals(1, newColl.size());
    }

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