All Implemented Interfaces:
Direct Known Subclasses:
public abstract class
Obtain an access token via the credential-based OAuth2 workflow. This
abstract class requires only that implementations provide the credential,
which the class then uses to obtain a refresh token.
Methods inherited from class java.lang.
Object clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Obtain the access token that should be added to http connection's header.
Will be called for each connection, so implementations should be
performant. Implementations are responsible for any refreshing of
Returns: Access token to be added to connection header.
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