Docs and random annotations for overrides

src/main/java/mikera/util/emptyobjects/NullArrays.java

@@ -2,6 +2,9 @@
 
 import mikera.data.DataType;
 
+/**
+ * Null array type Singletons
+ */
 public class NullArrays {
 	public static final Object[] NULL_OBJECTS=new Object[0];
 	public static final float[] NULL_FLOATS=new float[0];

src/main/java/mikera/util/emptyobjects/NullCollection.java

@@ -7,6 +7,9 @@
 import mikera.persistent.PersistentCollection;
 import mikera.persistent.impl.SingletonList;
 
+/**
+ * Immutable empty collection type and singleton
+ */
 public final class NullCollection<T> extends PersistentCollection<T> {
 	private static final long serialVersionUID = 2925953822669265599L;
 
@@ -17,78 +20,96 @@ protected NullCollection() {
 
 	}
 
+	@Override
 	public boolean add(T e) {
 		throw new UnsupportedOperationException();
 	}
 
+	@Override
 	public boolean addAll(Collection<? extends T> c) {
 		throw new UnsupportedOperationException();
 	}
 
+	@Override
 	public void clear() {
 		throw new UnsupportedOperationException();
 	}
 
+	@Override
 	public boolean contains(Object o) {
 		return false;
 	}
 
+	@Override
 	public boolean containsAll(Collection<?> c) {
 		if (c.isEmpty()) return true;
 		return false;
 	}
 
+	@Override
 	public boolean isEmpty() {
 		return true;
 	}
 
 	@SuppressWarnings("unchecked")
+	@Override
 	public Iterator<T> iterator() {
 		return (Iterator<T>)NullIterator.INSTANCE;
 	}
 
+	@Override
 	public boolean remove(Object o) {
 		throw new UnsupportedOperationException();
 	}
 
+	@Override
 	public boolean removeAll(Collection<?> c) {
 		throw new UnsupportedOperationException();
 	}
 
+	@Override
 	public boolean retainAll(Collection<?> c) {
 		throw new UnsupportedOperationException();
 	}
 
+	@Override
 	public int size() {
 		return 0;
 	}
 
+	@Override
 	public Object[] toArray() {
 		return NullArrays.NULL_OBJECTS;
 	}
 
 	@SuppressWarnings({ "unchecked", "hiding" })
+	@Override
 	public <T> T[] toArray(T[] a) {
 		return (T[])toArray();
 	}
 
+	@Override
 	public PersistentCollection<T> delete(T value) {
 		return this;
 	}
 
+	@Override
 	public PersistentCollection<T> deleteAll(Collection<T> values) {
 		return this;
 	}
 
+	@Override
 	public PersistentCollection<T> clone() {
 		return this;
 	}
 
+	@Override
 	public int hashCode() {
 		return 0;
 	}
 
 	@SuppressWarnings("unchecked")
+	@Override
 	public boolean equals(Object a) {
 		return ((a instanceof PersistentCollection<?>)&&((PersistentCollection<T>)a).isEmpty());
 	}