bindings property
Associates a list of members, or principals, with a role. Optionally,
may specify a condition that determines how and when the bindings are
applied. Each of the bindings must contain at least one principal.
The bindings in a Policy can refer to up to 1,500 principals; up to 250
of these principals can be Google groups. Each occurrence of a principal
counts towards these limits. For example, if the bindings grant 50
different roles to user:alice@example.com, and not to any other
principal, then you can add another 1,450 principals to the bindings in
the Policy.
Implementation
final List<Binding> bindings;