[DllImport("ebook")]
		static extern unsafe bool e_book_get_contacts(IntPtr raw, IntPtr query, out IntPtr contacts, out IntPtr error);

		public unsafe Contact[] GetContacts(Evolution.BookQuery query) {
			if (query == null)
				throw new ArgumentNullException ("query");

			IntPtr contacts_handle;
			IntPtr error = IntPtr.Zero;
			bool raw_ret = e_book_get_contacts(Handle, query.Handle, out contacts_handle, out error);
			if (error != IntPtr.Zero) throw new GLib.GException (error);
			if (raw_ret == false)
				return null;

			GLib.List cl = new GLib.List(contacts_handle, typeof (Contact));
			Contact[] result = new Contact [cl.Count];
			for (int i = 0; i < cl.Count; i++)
				result [i] = cl [i] as Contact;

			return result;
		}

                [DllImport("ebook")]
		static extern unsafe bool e_book_get_book_view(IntPtr raw, IntPtr query, IntPtr requested_fields, int max_results, out IntPtr book_view, out IntPtr error);

		public unsafe BookView GetBookView (Evolution.BookQuery query,
						    IEnumerable requestedFields,
						    int max_results) {
			IntPtr error = IntPtr.Zero;
			IntPtr bookHandle;

			GLib.List fieldsList = new GLib.List (typeof (string));
			if (requestedFields != null) {
			        foreach (string field in requestedFields) {
				        fieldsList.Append (field);
				}
			}

			bool raw_ret = e_book_get_book_view (Handle,
							     query.Handle,
							     fieldsList.Handle,
							     max_results,
							     out bookHandle,
							     out error);
			if (error != IntPtr.Zero) throw new GLib.GException (error);
			if (raw_ret == false || bookHandle == (IntPtr)0) 
				return null;

			return new BookView (bookHandle);
		}
			

		[DllImport("evolutionglue")]
		static extern bool e_book_glue_ebook_get_changes(IntPtr raw, 
									string changeid, 
									out IntPtr added, 
									out IntPtr modified,
									out IntPtr deleted,
									out IntPtr error);

		public unsafe bool GetChanges(string changeid, 
					      out Contact[] newcontacts,
					      out Contact[] updated,
					      out String[] removed ) 
		{

			IntPtr error = IntPtr.Zero;
			IntPtr added = IntPtr.Zero;
			IntPtr modified = IntPtr.Zero;
			IntPtr deleted = IntPtr.Zero;

			bool raw_ret = e_book_glue_ebook_get_changes (Handle,
								    changeid,
								    out added,
								    out modified,
								    out deleted,
								    out error);
			if (error != IntPtr.Zero) throw new GLib.GException (error);

			if (raw_ret == false) {
				newcontacts = new Contact [0];
				updated = new Contact [0];
				removed = new string [0];
				return raw_ret;
			}

			GLib.SList cl;
			if (added != IntPtr.Zero) {
				cl = new GLib.SList(added, typeof (Contact));
				newcontacts = new Contact [cl.Count];
				for (int i = 0; i < cl.Count; i++)
					newcontacts [i] = cl [i] as Contact;
			} else {
				newcontacts = new Contact [0];
			}

			if (modified != IntPtr.Zero) {
				cl = new GLib.SList(modified, typeof (Contact));
				updated = new Contact [cl.Count];
				for (int i = 0; i < cl.Count; i++)
					updated [i] = cl [i] as Contact;
			} else {
				updated = new Contact [0];
			}
			
			if (deleted != IntPtr.Zero) {
				GLib.SList sl = new GLib.SList(deleted, typeof (string));
				removed = new string [sl.Count];
				for (int i = 0; i < sl.Count; i++)
					removed [i] = sl [i] as String;
			} else {
				removed = new string [0];
			}

			return raw_ret;
		}