RecordStore in Java

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RecordStore
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A RecordStore isn't built via a constructor like most other objects; rather, it's effectively requested from the client device via a static method call:
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RecordStore openRecordStore(String recordName, boolean createIfNecessary)
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If a RecordStore specified by the recordName argument exists on the device, it's found and returned If it doesn't exist and the createIfNecessary Boolean argument is true, a new
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RecordStore is built and returned If an exception is thrown, it might not exist, or the device might not be able to create any new RecordStores (possibly not enough spare memory) Other useful RecordStore methods available are described in the following sections addRecord() int addRecord(byte[] data, int offset, int numBytes)
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This is the single method used to add new data to a RecordStore The data must be handled as a byte array, and will be stored in the new record as such You can specify the offset index in the data array and the number of bytes to actually store If successfully added (without generating an exception), the method will return the recordId int for the new record Because this is a write operation, the RecordStore is blocked to all other accesses until the record is fully written and added successfully
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getRecord() getRecord(int recordId)
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This returns a copy of the byte array stored at the location specified by recordId Note that it indeed returns a copy; changing the copy won't alter the record in any way If the recordId doesn't exist in the record, this will throw an InvalidRecordIDException
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getRecord(int recordId, byte[] buffer, int offset)
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Instead of returning the byte array, this method inserts a copy of the record's array into the supplied buffer array, beginning at the offset index in the buffer It then returns an int representing the number of bytes copied into the buffer Note that this could result in an ArrayIndexOutOfBounds exception if the buffer is too small to accommodate the record's array from the offset index
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setRecord() setRecord(int recordId, byte[] newData, int offset, int numBytes)
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This is used similarly to the addRecord() method, but it wholly replaces the record at the recordId specified The recordId remains in the RecordStore, but now points to the new data The offset can be used to point at a starting index in the newData array, along with numBytes, to indicate the range of newData's indices that will actually be stored as its own array in the record
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deleteRecord() deleteRecord(int recordId)
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This deletes the record in the store associated with the recordId The recordId value is effectively gone from the RecordStore and will not be reused
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getLastModified() long getLastModified()
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This returns the last time the record store was modified
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getNextRecordID() int getNextRecordID()
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Returns the recordId that would be assigned to the next record added This is useful when we need to check up on the recordId status without actually adding a record
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getNumRecords() int getNumRecords()
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Returns the number of records currently in the RecordStore This has no relation to the recordId status
getSize() getSize()
Returns the total size, in bytes, used by the RecordStore
getSizeAvailable() getSizeAvailable()
This returns the total bytes still available in the device's storage for the RecordStore to use For some games and applications, this will be a key method to confirm how much to rely upon the local device storage, and to scale that reliance appropriately
deleteRecordStore() deleteRecordStore(String recordName)
This is a static class method, and it completely removes a RecordStore from the device's persistent memory storage This is unrecoverable, and any data remaining in the RecordStore is lost If you need to reset a RecordStore and start from scratch (at recordId == 1), you'll need to delete it and create a new one
EnumerateRecords() RecordEnumeration enumerateRecords(RecordFilter filter, RecordComparator comparator, boolean keepUpdated)
We'll look a little at enumerating RecordStores later in the chapter Enumeration allows for some greater flexibility in record handling, at the cost of some efficiency