42c71a5790
Contributed by Steve Loughran. This complements the StreamCapabilities Interface by allowing applications to probe for a specific path on a specific instance of a FileSystem client to offer a specific capability. This is intended to allow applications to determine * Whether a method is implemented before calling it and dealing with UnsupportedOperationException. * Whether a specific feature is believed to be available in the remote store. As well as a common set of capabilities defined in CommonPathCapabilities, file systems are free to add their own capabilities, prefixed with fs. + schema + . The plan is to identify and document more capabilities -and for file systems which add new features, for a declaration of the availability of the feature to always be available. Note * The remote store is not expected to be checked for the feature; It is more a check of client API and the client's configuration/knowledge of the state of the remote system. * Permissions are not checked. |
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