Sun Microsystems Sun StorageTek 5800 - Manual (Page 30)

later for retrieving objects. External storage can be accomplished using an identifier's string
representation by invoking the toString method. An instance of ObjectIdentifier can be
reconstituted using the constructor that takes String as an argument.
QueryResultSet
Instances of QueryResultSet provide access to the objects and metadata matching a query. The
query results can be stepped through using the next method. The individual results are
identifiers representing objects that match the query.
If selectKeys was specified in the original query, these metadata fields can be accessed using
the typed getter methods with each field’s name.
SystemRecord
Instances of SystemRecord represent the system metadata for an object, including OID, object
size, SHA1 hash, and creation time. They are returned by storeObject and storeMetadata.
NameValueRecord
Instances of NameValueRecord represent metadata used by the 5800 system to store and index
user-extensible lists of name-value pairs. For convenience, instances of NameValueRecord also
contain references to the SystemRecord instances of the objects they represent.
NameValueObjectArchive Application Access
Most applications make use of the NameValueObjectArchive class. This class ensures that a
default metadata entry is created for every data object stored, even if no metadata is explicitly
provided at store time.
The NameValueObjectArchive object functions as a proxy for the 5800 system server. All access
is enabled by invoking methods on this object.
The following key methods and classes are used with the NameValueObjectArchive class:
■ “NameValueObjectArchive” on page 31
■ “delete” on page 31
■ “storeObject” on page 31
■ “storeMetadata” on page 32
■ “checkIndexed” on page 32
■ “retrieveObject” on page 33
■ “retrieveMetadata” on page 33
■ “getSchema” on page 33
■ “query” on page 34
■ “query (with selectKeys)” on page 34
Java API
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