net.jinx.db
Class MemoryHierarchy

java.lang.Object
  net.jinx.db.Hierarchy
      net.jinx.db.SimpleHierarchy
          net.jinx.db.MemoryHierarchy

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

XMLHierarchy

public class MemoryHierarchy
extends SimpleHierarchy

Extension of SimpleHierarchy that adds functional commit() and rollback() methods that store and retrieve data from an in-memory backup.

API Stability: Alpha.

See Also:

Serialized Form

Constructor Summary

MemoryHierarchy()
Constructs a MemoryHierarchy object.

MemoryHierarchy(java.io.File file)
Utility constructor to read in the contents of an XML File.

Method Summary

void	close() Does nothing.
void	commit() Commits changes to the commit/rollback log.
protected Hierarchy	getLog() Provides the Hierarchy that is used to store the commit/rollback log.
void	rollback() Rolls this Hierarchy back to the last committed state.

Methods inherited from class net.jinx.db.SimpleHierarchy

attributes, clearAttributes, clearNodes, createNode, deleteNode, getAttributeObject, getNode, hasAttribute, nodes, removeAttribute, setAttributeObject

Methods inherited from class net.jinx.db.Hierarchy

addListener, clear, copyTo, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, getAttribute, parseFromProperties, parseFromXML, propertyChanged, removeListener, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, setAttribute, storeToProperties, storeToXML

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MemoryHierarchy

public MemoryHierarchy()

Constructs a MemoryHierarchy object.

MemoryHierarchy

public MemoryHierarchy(java.io.File file)

Utility constructor to read in the contents of an XML File. This calls commit() after the file has been successfully parsed.

Parameters:

file - the File object pointing to the file to parse.

Throws:

HierarchyException - if an error occurs while reading the file.

Method Detail

getLog

protected Hierarchy getLog()

Provides the Hierarchy that is used to store the commit/rollback log.

Returns:

the log Hierarchy.

close

public void close()

Does nothing.

Overrides:

close in class SimpleHierarchy

commit

public void commit()

Commits changes to the commit/rollback log.

Overrides:

commit in class SimpleHierarchy

rollback

public void rollback()

Rolls this Hierarchy back to the last committed state.

Overrides:

rollback in class SimpleHierarchy