Examples of java.util.EnumMap

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

  public static Map<Object, Object> createMap(Class<?> mapType, Class<?> keyType, int size) {


    Assert.notNull(mapType, "Map type must not be null!");


    if (EnumMap.class.isAssignableFrom(mapType)) {
      return new EnumMap(asEnumType(keyType));
    }


    return org.springframework.core.CollectionFactory.createMap(mapType, size);
  }

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                        case ID_CC_ENUM_MAP: {
                            int idx = instanceCache.size();
                            instanceCache.add(null);
                            final ClassDescriptor nestedDescriptor = doReadClassDescriptor(readUnsignedByte());
                            final Class<? extends Enum> elementType = nestedDescriptor.getType().asSubclass(Enum.class);
                            return replace(readMapData(unshared, idx, len, new EnumMap(elementType)));
                        }
                        case ID_CC_NCOPIES: {
                            final int idx = instanceCache.size();
                            instanceCache.add(null);
                            final Object obj = Collections.nCopies(len, doReadNestedObject(false, "n-copies member object"));

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        if (attributeName == null) {
            throw new ConversionException("No EnumType specified for EnumMap");
        }
        final Class<?> type = mapper().realClass(reader.getAttribute(attributeName));
        @SuppressWarnings({"rawtypes", "unchecked"})
        final EnumMap<?, ?> map = new EnumMap(type);
        populateMap(reader, context, map);
        return map;
    }

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        super.marshal(source, writer, context);
    }


    public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
        Class type = mapper().realClass(reader.getAttribute(mapper().aliasForAttribute("enum-type")));
        EnumMap map = new EnumMap(type);
        populateMap(reader, context, map);
        return map;
    }

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  // This is legit because enumKeyType above is both an enum type (checked at
  // runtime in the EnumMap ctor) and is the type of a subclass of K.
  @SuppressWarnings({ "rawtypes", "unchecked" })
  private static <K, V>
  Map<K, V> makeEnumMap(Class<? extends Enum> t) { return new EnumMap(t); }

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        String attributeName = mapper().aliasForSystemAttribute("enum-type");
        if (attributeName == null) {
            throw new ConversionException("No EnumType specified for EnumMap");
        }
        Class type = mapper().realClass(reader.getAttribute(attributeName));
        EnumMap map = new EnumMap(type);
        populateMap(reader, context, map);
        return map;
    }

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        checkNotNull(entry.getKey());
        checkNotNull(entry.getValue());
      }
      @SuppressWarnings("unchecked")
      // immutable collections are safe for covariant casts
      ImmutableMap<K, V> result = ImmutableEnumMap.asImmutable(new EnumMap(enumMap));
      return result;
    }


    int size = map.size();
    switch (size) {

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        checkNotNull(entry.getKey());
        checkNotNull(entry.getValue());
      }
      @SuppressWarnings("unchecked")
      // immutable collections are safe for covariant casts
      ImmutableMap<K, V> result = ImmutableEnumMap.asImmutable(new EnumMap(enumMap));
      return result;
    }


    @SuppressWarnings("unchecked") // we won't write to this array
    Entry<K, V>[] entries = map.entrySet().toArray(new Entry[0]);

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    /**
     * @tests java.util.EnumMap#equals(Object)
     */
    @SuppressWarnings( { "unchecked", "boxing" })
    public void test_equalsLjava_lang_Object() {
        EnumMap enumMap = new EnumMap(Size.class);
        enumMap.put(Size.Small, 1);


        EnumMap enumSizeMap = new EnumMap(Size.class);
        assertFalse("Returned true for unequal EnumMap", enumSizeMap //$NON-NLS-1$
                .equals(enumMap));
        enumSizeMap.put(Size.Small, 1);
        assertTrue("Returned false for equal EnumMap", enumSizeMap //$NON-NLS-1$
                .equals(enumMap));
        enumSizeMap.put(Size.Big, null);
        assertFalse("Returned true for unequal EnumMap", enumSizeMap //$NON-NLS-1$
                .equals(enumMap));


        enumMap.put(Size.Middle, null);
        assertFalse("Returned true for unequal EnumMap", enumSizeMap //$NON-NLS-1$
                .equals(enumMap));
        enumMap.remove(Size.Middle);
        enumMap.put(Size.Big, 3);
        assertFalse("Returned true for unequal EnumMap", enumSizeMap //$NON-NLS-1$
                .equals(enumMap));
        enumMap.put(Size.Big, null);
        assertTrue("Returned false for equal EnumMap", enumSizeMap //$NON-NLS-1$
                .equals(enumMap));


        HashMap hashMap = new HashMap();
        hashMap.put(Size.Small, 1);
        assertFalse("Returned true for unequal EnumMap", hashMap //$NON-NLS-1$
                .equals(enumMap));
        hashMap.put(Size.Big, null);
        assertTrue("Returned false for equal EnumMap", enumMap.equals(hashMap)); //$NON-NLS-1$


        assertFalse("Should return false", enumSizeMap //$NON-NLS-1$
                .equals(new Integer(1)));
    }

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    /**
     * @tests java.util.EnumMap#keySet()
     */
    @SuppressWarnings( { "unchecked", "boxing" })
    public void test_keySet() {
        EnumMap enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 2);
        enumSizeMap.put(Size.Big, null);
        Set set = enumSizeMap.keySet();


        Set set1 = enumSizeMap.keySet();
        assertSame("Should be same", set1, set); //$NON-NLS-1$
        try {
            set.add(Size.Big);
            fail("Should throw UnsupportedOperationException"); //$NON-NLS-1$
        } catch (UnsupportedOperationException e) {
            // Expected
        }


        assertTrue("Returned false for contained object", set//$NON-NLS-1$
                .contains(Size.Middle));
        assertTrue("Returned false for contained object", set//$NON-NLS-1$
                .contains(Size.Big));
        assertFalse("Returned true for uncontained object", set //$NON-NLS-1$
                .contains(Size.Small));
        assertFalse("Returned true for uncontained object", set //$NON-NLS-1$
                .contains(new Integer(1)));
        assertTrue("Returned false when the object can be removed", set //$NON-NLS-1$
                .remove(Size.Big));
        assertFalse("Returned true for uncontained object", set //$NON-NLS-1$
                .contains(Size.Big));
        assertFalse("Returned true when the object can not be removed", set //$NON-NLS-1$
                .remove(Size.Big));
        assertFalse("Returned true when the object can not be removed", set //$NON-NLS-1$
                .remove(new Integer(1)));


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


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


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        Collection c = new ArrayList();
        c.add(Size.Big);
        assertTrue("Should return true", set.containsAll(c)); //$NON-NLS-1$
        c.add(Size.Small);
        assertFalse("Should return false", set.containsAll(c)); //$NON-NLS-1$
        assertTrue("Should return true", set.removeAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 1, set.size()); //$NON-NLS-1$
        assertFalse("Should return false", set.removeAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 1, set.size()); //$NON-NLS-1$
        try {
            set.addAll(c);
            fail("Should throw UnsupportedOperationException"); //$NON-NLS-1$
        } catch (UnsupportedOperationException e) {
            // Expected
        }


        enumSizeMap.put(Size.Big, null);
        assertEquals("Wrong size", 2, set.size()); //$NON-NLS-1$
        assertTrue("Should return true", set.retainAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 1, set.size()); //$NON-NLS-1$
        assertFalse("Should return false", set.retainAll(c)); //$NON-NLS-1$
        assertEquals(1, set.size());
        Object[] array = set.toArray();
        assertEquals("Wrong length", 1, array.length); //$NON-NLS-1$
        assertEquals("Wrong key", Size.Big, array[0]); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        c = new ArrayList();
        c.add(Color.Blue);
        assertFalse("Should return false", set.remove(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 2, set.size()); //$NON-NLS-1$
        assertTrue("Should return true", set.retainAll(c)); //$NON-NLS-1$
        assertEquals("Wrong size", 0, set.size()); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();


        Iterator iter = set.iterator();
        Enum enumKey = (Enum) iter.next();
        assertTrue("Returned false for contained object", set.contains(enumKey)); //$NON-NLS-1$
        enumKey = (Enum) iter.next();
        assertTrue("Returned false for contained object", set.contains(enumKey)); //$NON-NLS-1$


        enumSizeMap.remove(Size.Big);
        assertFalse("Returned true for uncontained object", set //$NON-NLS-1$
                .contains(enumKey));
        iter.remove();
        try {
            iter.remove();
            fail("Should throw IllegalStateException"); //$NON-NLS-1$
        } catch (IllegalStateException e) {
            // Expected
        }
        assertFalse("Returned true for uncontained object", set //$NON-NLS-1$
                .contains(enumKey));


        iter = set.iterator();
        enumKey = (Enum) iter.next();
        assertTrue("Returned false for contained object", set.contains(enumKey)); //$NON-NLS-1$
        enumSizeMap.put(Size.Middle, 3);
        assertTrue("Returned false for contained object", set.contains(enumKey)); //$NON-NLS-1$


        enumSizeMap = new EnumMap(Size.class);
        enumSizeMap.put(Size.Middle, 1);
        enumSizeMap.put(Size.Big, null);
        set = enumSizeMap.keySet();
        iter = set.iterator();
        try {
            iter.remove();
            fail("Should throw IllegalStateException"); //$NON-NLS-1$
        } catch (IllegalStateException e) {

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