Examples of java.util.EnumMap$KeySet

java.util.EnumMap
A specialized {@link Map} implementation for use with enum type keys. Allof the keys in an enum map must come from a single enum type that is specified, explicitly or implicitly, when the map is created. Enum maps are represented internally as arrays. This representation is extremely compact and efficient.
Enum maps are maintained in the natural order of their keys (the order in which the enum constants are declared). This is reflected in the iterators returned by the collections views ( {@link #keySet()}, {@link #entrySet()}, and {@link #values()}).
Iterators returned by the collection views are weakly consistent: they will never throw {@link ConcurrentModificationException} and they mayor may not show the effects of any modifications to the map that occur while the iteration is in progress.
Null keys are not permitted. Attempts to insert a null key will throw {@link NullPointerException}. Attempts to test for the presence of a null key or to remove one will, however, function properly. Null values are permitted.
Like most collection implementations EnumMap is not synchronized. If multiple threads access an enum map concurrently, and at least one of the threads modifies the map, it should be synchronized externally. This is typically accomplished by synchronizing on some object that naturally encapsulates the enum map. If no such object exists, the map should be "wrapped" using the {@link Collections#synchronizedMap}method. This is best done at creation time, to prevent accidental unsynchronized access:
```
 Map<EnumKey, V> m = Collections.synchronizedMap(new EnumMap<EnumKey, V>(...)); 
```
Implementation note: All basic operations execute in constant time. They are likely (though not guaranteed) to be faster than their {@link HashMap} counterparts.
This class is a member of the Java Collections Framework. @author Josh Bloch @version 1.16, 04/21/06 @see EnumSet @since 1.5

    /**
     * @tests java.util.EnumMap#get(Object)
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_getLjava_lang_Object() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        assertNull("Get returned non-null for non mapped key", enumSizeMap //$NON-NLS-1$
                .get(Size.Big));
        enumSizeMap.put(Size.Big, 1);
        assertEquals("Get returned incorrect value for given key", 1, //$NON-NLS-1$
                enumSizeMap.get(Size.Big));
        
        assertNull("Get returned non-null for non mapped key", enumSizeMap //$NON-NLS-1$
                .get(Size.Small));
        assertNull("Get returned non-null for non existent key", enumSizeMap //$NON-NLS-1$
                .get(Color.Red));
        assertNull("Get returned non-null for non existent key", enumSizeMap //$NON-NLS-1$
                .get(new Integer(1)));
        assertNull("Get returned non-null for non existent key", enumSizeMap //$NON-NLS-1$
                .get(null));


        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        assertNull("Get returned non-null for non mapped key", enumColorMap //$NON-NLS-1$
                .get(Color.Green));
        enumColorMap.put(Color.Green, 2);
        assertEquals("Get returned incorrect value for given key", 2, //$NON-NLS-1$
                enumColorMap.get(Color.Green));
        assertNull("Get returned non-null for non mapped key", enumColorMap //$NON-NLS-1$
                .get(Color.Blue));
        
        enumColorMap.put(Color.Green, new Double(4));
        assertEquals("Get returned incorrect value for given key", //$NON-NLS-1$
                new Double(4), enumColorMap.get(Color.Green));
        enumColorMap.put(Color.Green, new Integer("3"));//$NON-NLS-1$
        assertEquals("Get returned incorrect value for given key", new Integer( //$NON-NLS-1$
                "3"), enumColorMap.get(Color.Green));//$NON-NLS-1$
        enumColorMap.put(Color.Green, null);
        assertNull("Can not handle null value", enumColorMap.get(Color.Green)); //$NON-NLS-1$
        Float f = new Float("3.4");//$NON-NLS-1$
        enumColorMap.put(Color.Green, f);
        assertSame("Get returned incorrect value for given key", f, //$NON-NLS-1$
                enumColorMap.get(Color.Green));
    }

View Full Code Here

    /**
     * @tests java.util.EnumMap#put(Object,Object)
     */
    @SuppressWarnings( { "unchecked", "boxing" })
    public void test_putLjava_lang_ObjectLjava_lang_Object() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        try {
            enumSizeMap.put(Color.Red, 2);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }
        assertNull("Return non-null for non mapped key", enumSizeMap.put( //$NON-NLS-1$
                Size.Small, 1));


        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        try {
            enumColorMap.put(Size.Big, 2);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }
        try {
            enumColorMap.put(null, 2);
            fail("Expected NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }
        assertNull("Return non-null for non mapped key", enumColorMap.put( //$NON-NLS-1$
                Color.Green, 2));
        assertEquals("Return wrong value", 2, enumColorMap.put(Color.Green, //$NON-NLS-1$
                new Double(4)));
        assertEquals("Return wrong value", new Double(4), enumColorMap.put( //$NON-NLS-1$
                Color.Green, new Integer("3")));//$NON-NLS-1$
        assertEquals("Return wrong value", new Integer("3"), enumColorMap.put( //$NON-NLS-1$//$NON-NLS-2$
                Color.Green, null));
        Float f = new Float("3.4");//$NON-NLS-1$
        assertNull("Return non-null for non mapped key", enumColorMap.put( //$NON-NLS-1$
                Color.Green, f));
        assertNull("Return non-null for non mapped key", enumColorMap.put( //$NON-NLS-1$
                Color.Blue, 2));
        assertEquals("Return wrong value", 2, enumColorMap.put(Color.Blue, //$NON-NLS-1$
                new Double(4)));
    }

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    /**
     * @tests java.util.EnumMap#putAll(Map)
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_putAllLjava_util_Map() {
        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        enumColorMap.put(Color.Green, 2);


        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumColorMap.putAll(enumSizeMap);


        enumSizeMap.put(Size.Big, 1);
        try {
            enumColorMap.putAll(enumSizeMap);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }


        EnumMap enumColorMap1 = new EnumMap<Color, Double>(Color.class);
        enumColorMap1.put(Color.Blue, 3);
        enumColorMap.putAll(enumColorMap1);
        assertEquals("Get returned incorrect value for given key", 3, //$NON-NLS-1$
                enumColorMap.get(Color.Blue));
        assertEquals("Wrong Size", 2, enumColorMap.size()); //$NON-NLS-1$

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    /**
     * @tests java.util.EnumMap#remove(Object)
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_removeLjava_lang_Object() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        assertNull("Remove of non-mapped key returned non-null", enumSizeMap //$NON-NLS-1$
                .remove(Size.Big));
        enumSizeMap.put(Size.Big, 3);
        enumSizeMap.put(Size.Middle, 2);


        assertNull("Get returned non-null for non mapped key", enumSizeMap //$NON-NLS-1$
                .get(Size.Small));
        assertEquals("Remove returned incorrect value", 3, enumSizeMap //$NON-NLS-1$
                .remove(Size.Big));
        assertNull("Get returned non-null for non mapped key", enumSizeMap //$NON-NLS-1$
                .get(Size.Big));
        assertNull("Remove of non-mapped key returned non-null", enumSizeMap //$NON-NLS-1$
                .remove(Size.Big));
        assertNull("Remove of non-existent key returned non-null", enumSizeMap //$NON-NLS-1$
                .remove(Color.Red));
        assertNull("Remove of non-existent key returned non-null", enumSizeMap //$NON-NLS-1$
                .remove(new Double(4)));
        assertNull("Remove of non-existent key returned non-null", enumSizeMap //$NON-NLS-1$
                .remove(null));


        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        assertNull("Get returned non-null for non mapped key", enumColorMap //$NON-NLS-1$
                .get(Color.Green));
        enumColorMap.put(Color.Green, new Double(4));
        assertEquals("Remove returned incorrect value", new Double(4), //$NON-NLS-1$
                enumColorMap.remove(Color.Green));
        assertNull("Get returned non-null for non mapped key", enumColorMap //$NON-NLS-1$
                .get(Color.Green));
        enumColorMap.put(Color.Green, null);
        assertNull("Can not handle null value", enumColorMap //$NON-NLS-1$
                .remove(Color.Green));
        assertNull("Get returned non-null for non mapped key", enumColorMap //$NON-NLS-1$
                .get(Color.Green));
    }

View Full Code Here

    /**
     * @tests java.util.EnumMap#size()
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_size() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        assertEquals("Wrong size", 0, enumSizeMap.size()); //$NON-NLS-1$
        enumSizeMap.put(Size.Small, 1);
        assertEquals("Wrong size", 1, enumSizeMap.size()); //$NON-NLS-1$
        enumSizeMap.put(Size.Small, 0);
        assertEquals("Wrong size", 1, enumSizeMap.size()); //$NON-NLS-1$
        try {
            enumSizeMap.put(Color.Red, 2);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }
        assertEquals("Wrong size", 1, enumSizeMap.size()); //$NON-NLS-1$
        
        enumSizeMap.put(Size.Middle, null);
        assertEquals("Wrong size", 2, enumSizeMap.size()); //$NON-NLS-1$
        enumSizeMap.remove(Size.Big);
        assertEquals("Wrong size", 2, enumSizeMap.size()); //$NON-NLS-1$
        enumSizeMap.remove(Size.Middle);
        assertEquals("Wrong size", 1, enumSizeMap.size()); //$NON-NLS-1$
        enumSizeMap.remove(Color.Green);
        assertEquals("Wrong size", 1, enumSizeMap.size()); //$NON-NLS-1$


        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        enumColorMap.put(Color.Green, 2);
        assertEquals("Wrong size", 1, enumColorMap.size()); //$NON-NLS-1$
        enumColorMap.remove(Color.Green);
        assertEquals("Wrong size", 0, enumColorMap.size()); //$NON-NLS-1$


        EnumMap enumEmptyMap = new EnumMap<Empty, Double>(Empty.class);
        assertEquals("Wrong size", 0, enumEmptyMap.size()); //$NON-NLS-1$
    }

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    /**
     * @tests java.util.EnumMap#values()
     */
    @SuppressWarnings( { "unchecked", "boxing" })
    public void test_values() {
        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        enumColorMap.put(Color.Red, 1);
        enumColorMap.put(Color.Blue, null);
        Collection collection = enumColorMap.values();


        Collection collection1 = enumColorMap.values();
        assertSame("Should be same", collection1, collection); //$NON-NLS-1$
        try {
            collection.add(new Integer(1));
            fail("Should throw UnsupportedOperationException"); //$NON-NLS-1$
        } catch (UnsupportedOperationException e) {
            // Expected
        }


        assertTrue("Returned false for contained object", collection//$NON-NLS-1$
                .contains(1));
        assertTrue("Returned false for contained object", collection//$NON-NLS-1$
                .contains(null));
        assertFalse("Returned true for uncontained object", collection //$NON-NLS-1$
                .contains(2));


        assertTrue("Returned false when the object can be removed", collection //$NON-NLS-1$
                .remove(null));
        assertFalse("Returned true for uncontained object", collection //$NON-NLS-1$
                .contains(null));
        assertFalse("Returned true when the object can not be removed", //$NON-NLS-1$
                collection.remove(null));


        // The set is backed by the map so changes to one are reflected by the
        // other.
        enumColorMap.put(Color.Blue, 3);
        assertTrue("Returned false for contained object", collection//$NON-NLS-1$
                .contains(3));
        enumColorMap.remove(Color.Blue);
        assertFalse("Returned true for uncontained object", collection//$NON-NLS-1$
                .contains(3));


        assertEquals("Wrong size", 1, collection.size()); //$NON-NLS-1$
        collection.clear();
        assertEquals("Wrong size", 0, collection.size()); //$NON-NLS-1$


        enumColorMap = new EnumMap<Color, Double>(Color.class);
        enumColorMap.put(Color.Red, 1);
        enumColorMap.put(Color.Blue, null);
        collection = enumColorMap.values();
        Collection c = new ArrayList();
        c.add(new Integer(1));
        assertTrue("Should return true", collection.containsAll(c)); //$NON-NLS-1$
        c.add(new Double(3.4));
        assertFalse("Should return false", collection.containsAll(c)); //$NON-NLS-1$
        assertTrue("Should return true", collection.removeAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 1, collection.size()); //$NON-NLS-1$
        assertFalse("Should return false", collection.removeAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 1, collection.size()); //$NON-NLS-1$
        try {
            collection.addAll(c);
            fail("Should throw UnsupportedOperationException"); //$NON-NLS-1$
        } catch (UnsupportedOperationException e) {
            // Expected
        }


        enumColorMap.put(Color.Red, 1);
        assertEquals("Wrong size", 2, collection.size()); //$NON-NLS-1$
        assertTrue("Should return true", collection.retainAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 1, collection.size()); //$NON-NLS-1$
        assertFalse("Should return false", collection.retainAll(c)); //$NON-NLS-1$
        assertEquals(1, collection.size());
        Object[] array = collection.toArray();
        assertEquals("Wrong length", 1, array.length); //$NON-NLS-1$
        assertEquals("Wrong key", 1, array[0]); //$NON-NLS-1$


        enumColorMap = new EnumMap<Color, Double>(Color.class);
        enumColorMap.put(Color.Red, 1);
        enumColorMap.put(Color.Blue, null);
        collection = enumColorMap.values();


        assertEquals("Wrong size", 2, collection.size()); //$NON-NLS-1$
        assertFalse("Returned true when the object can not be removed", //$NON-NLS-1$
                collection.remove(new Integer("10"))); //$NON-NLS-1$


        Iterator iter = enumColorMap.values().iterator();
        Object value = iter.next();
        assertTrue("Returned false for contained object", collection //$NON-NLS-1$
                .contains(value));
        value = iter.next();
        assertTrue("Returned false for contained object", collection //$NON-NLS-1$
                .contains(value));


        enumColorMap.put(Color.Green, 1);
        enumColorMap.remove(Color.Blue);
        assertFalse("Returned true for uncontained object", collection //$NON-NLS-1$
                .contains(value));
        iter.remove();
        try {
            iter.remove();
            fail("Should throw IllegalStateException"); //$NON-NLS-1$
        } catch (IllegalStateException e) {
            // Expected
        }
        assertFalse("Returned true for uncontained object", collection //$NON-NLS-1$
                .contains(value));


        iter = enumColorMap.values().iterator();
        value = iter.next();
        assertTrue("Returned false for contained object", collection //$NON-NLS-1$
                .contains(value));
        enumColorMap.put(Color.Green, 3);
        assertTrue("Returned false for contained object", collection //$NON-NLS-1$
                .contains(value));
        assertTrue("Returned false for contained object", collection //$NON-NLS-1$
                .remove(new Integer("1"))); //$NON-NLS-1$
        assertEquals("Wrong size", 1, collection.size()); //$NON-NLS-1$
        collection.clear();
        assertEquals("Wrong size", 0, collection.size()); //$NON-NLS-1$


        enumColorMap = new EnumMap<Color, Double>(Color.class);
        Integer integer1 = new Integer(1);
        enumColorMap.put(Color.Green, integer1);
        enumColorMap.put(Color.Blue, null);
        collection = enumColorMap.values();
        iter = enumColorMap.values().iterator();
        try {
            iter.remove();
            fail("Should throw IllegalStateException"); //$NON-NLS-1$
        } catch (IllegalStateException e) {
            // Expected

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     * @tests java.util.EnumMap#EnumMap(Class)
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_ConstructorLjava_lang_Class() {
        try {
            new EnumMap((Class) null);
            fail("Expected NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }
        
        
        try {
            new EnumMap(Size.Big.getClass());
            fail("Expected NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }


        try {
            new EnumMap(Integer.class);
            fail("Expected NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }


        EnumMap enumColorMap = new EnumMap<Color, Double>(Color.class);
        assertNull("Return non-null for non mapped key", enumColorMap.put( //$NON-NLS-1$
                Color.Green, 2));
        assertEquals("Get returned incorrect value for given key", 2, //$NON-NLS-1$
                enumColorMap.get(Color.Green));


        EnumMap enumEmptyMap = new EnumMap<Empty, Double>(Empty.class);
        try {
            enumEmptyMap.put(Color.Red, 2);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }


        EnumMap enumSizeMap = new EnumMap(Size.class);
        assertNull("Return non-null for non mapped key", enumSizeMap.put( //$NON-NLS-1$
                Size.Big, 2));
        assertEquals("Get returned incorrect value for given key", 2, //$NON-NLS-1$
                enumSizeMap.get(Size.Big));
        try {
            enumSizeMap.put(Color.Red, 2);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }
        
        enumSizeMap = new EnumMap(Size.Middle.getClass());
        assertNull("Return non-null for non mapped key", enumSizeMap.put( //$NON-NLS-1$
                Size.Small, 1));
        assertEquals("Get returned incorrect value for given key", 1, //$NON-NLS-1$
                enumSizeMap.get(Size.Small));
        try {
            enumSizeMap.put(Color.Red, 2);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }
    }

View Full Code Here

    /**
     * @tests java.util.EnumMap#EnumMap(EnumMap)
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_ConstructorLjava_util_EnumMap() {
        EnumMap enumMap;
        EnumMap enumColorMap = null;
        try {
            enumMap = new EnumMap(enumColorMap);
            fail("Expected NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }


        enumColorMap = new EnumMap<Color, Double>(Color.class);
        Double double1 = new Double(1);
        enumColorMap.put(Color.Green, 2);
        enumColorMap.put(Color.Blue, double1);
        
        enumMap = new EnumMap(enumColorMap);
        assertEquals("Constructor fails", 2, enumMap.get(Color.Green)); //$NON-NLS-1$
        assertSame("Constructor fails", double1, enumMap.get(Color.Blue)); //$NON-NLS-1$
        assertNull("Constructor fails", enumMap.get(Color.Red)); //$NON-NLS-1$
        enumMap.put(Color.Red, 1);
        assertEquals("Wrong value", 1, enumMap.get(Color.Red)); //$NON-NLS-1$

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    /**
     * @tests java.util.EnumMap#EnumMap(Map)
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_ConstructorLjava_util_Map() {
        EnumMap enumMap;
        Map enumColorMap = null;
        try {
            enumMap = new EnumMap(enumColorMap);
            fail("Expected NullPointerException"); //$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }
        enumColorMap = new EnumMap<Color, Double>(Color.class);
        enumMap = new EnumMap(enumColorMap);
        enumColorMap.put(Color.Blue, 3);
        enumMap = new EnumMap(enumColorMap);


        HashMap hashColorMap = null;
        try {
            enumMap = new EnumMap(hashColorMap);
            fail("Expected NullPointerException");//$NON-NLS-1$
        } catch (NullPointerException e) {
            // Expected
        }


        hashColorMap = new HashMap();
        try {
            enumMap = new EnumMap(hashColorMap);
            fail("Expected IllegalArgumentException"); //$NON-NLS-1$
        } catch (IllegalArgumentException e) {
            // Expected
        }


        hashColorMap.put(Color.Green, 2);
        enumMap = new EnumMap(hashColorMap);
        assertEquals("Constructor fails", 2, enumMap.get(Color.Green)); //$NON-NLS-1$
        assertNull("Constructor fails", enumMap.get(Color.Red)); //$NON-NLS-1$
        enumMap.put(Color.Red, 1);
        assertEquals("Wrong value", 1, enumMap.get(Color.Red)); //$NON-NLS-1$
        hashColorMap.put(Size.Big, 3);
        try {
            enumMap = new EnumMap(hashColorMap);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }


        hashColorMap = new HashMap();
        hashColorMap.put(new Integer(1), 1);
        try {
            enumMap = new EnumMap(hashColorMap);
            fail("Expected ClassCastException"); //$NON-NLS-1$
        } catch (ClassCastException e) {
            // Expected
        }
    }

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    /**
     * @tests java.util.EnumMap#clear()
     */
    @SuppressWarnings({ "unchecked", "boxing" })
    public void test_clear() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Small, 1);
        enumSizeMap.clear();
        assertNull("Failed to clear all elements", enumSizeMap.get(Size.Small)); //$NON-NLS-1$
    }

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