ResourceDB: added itemByHash() method

Added itemByHash() method to ResourceDB class allowing safe access to
an item identified with an according hash. If there's no item associated
with the hash, NULL is being returned.

Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>

include/ResourceDB.h

@@ -69,6 +69,7 @@ public:
 		return &m_topLevelNode;
 	}
 
+	const ResourceItem * itemByHash( const QString & _hash ) const;
 	const ResourceItem * nearestMatch( const ResourceItem & _item );
 
 	void addItem( ResourceItem * newItem );

src/core/ResourceDB.cpp

@@ -188,6 +188,19 @@ loadTreeItem( treeItem, e );
 
 
 
+const ResourceItem * ResourceDB::itemByHash( const QString & _hash ) const
+{
+	ItemList::ConstIterator it = m_items.find( _hash );
+	if( it != m_items.end() )
+	{
+		return it.value();
+	}
+	return NULL;
+}
+
+
+
+
 const ResourceItem * ResourceDB::nearestMatch( const ResourceItem & _item )
 {
 	if( !_item.hash().isEmpty() )