Package ch.javasoft.jbase

The jbase package and subpackages contain classes and interfaces for a simple Java database; the database does not support transactions or optimization techniques like indexing, supported operations include reading, appending, updating and removing of elements of a Table.

See:
Description

Interface Summary

EntityMarshaller<E>	A marshaller reads and writes table rows, i.e.
FixedWidthMarshaller<E>	A FixedWidthMarshaller is an extension of an entity marshaller where the row width is known, i.e.
RandomAccessPersister	Abstraction of storage which can be accessed randomly, such as RandomAccessFiles.
Table<E>	A Table stores entity objects, sometimes called row.

Class Summary

BufferedRandomAccessPersister	The BufferedRandomAccessPersister caches data in a hash table, and delegates the real i/o operations to an underlying delegate RandomAccessPersister.
FixedWidthTable<E>	The FixedWidthTable stores entities of known, fixed size.
MemoryTable<E>	The MemoryTable stores the entities in memory in an array list.
RandomAccessFilePersistor	The RandomAccessFilePersistor implements RandomAccessPersister using RandomAccessFiles.
VariableWidthTable<E>	The VariableWidthTablePaired stores entities of unknown, variable size.

Package ch.javasoft.jbase Description

The jbase package and subpackages contain classes and interfaces for a simple Java database; the database does not support transactions or optimization techniques like indexing, supported operations include reading, appending, updating and removing of elements of a Table.

The Table is a list-like container for objects of a certain type. Two implementations exist for tables:

• FixedWidthTable which allows storage of objects with a fixed byte size; a FixedWidthMarshaller takes care of the transformation of an object into bytes and vice versa.
• VariableWidthTable which allows storage of objects with varying byte size; a simple EntityMarshaller is responsible for byte-to-object and object-to-byte transformation. The VariableWidthTable makes use of multiple fixed width tables to store the entities; each entity can be stored or read with at most two file accesses.