de.schwarzrot.data.access.pref
Class PreferencesAccessor

java.lang.Object
  de.schwarzrot.data.access.pref.PreferencesAccessor

All Implemented Interfaces:

DataAccessor

public class PreferencesAccessor
extends Object
implements DataAccessor

wrapper class to access values from preferences in an abstract way. This class is mainly used for read purpose, like the counterpart from jdbc: resultset.

It hides the fallback mechanism which first reads a value from user space and if no such value exists, it tries to fetch it from system space.

Author:

Reinhard Mantey

Constructor Summary

PreferencesAccessor(PreferencesManager pm, EntityDescriptor ed)

PreferencesAccessor(PreferencesManager prefsManager, EntityDescriptor ed, String subPath)

PreferencesAccessor(PreferencesManager prefsManager, String nodePath)

Method Summary

void	close() close the data container and free resources
Collection<String>	entryNames() returns a list of names, that are known by this data collection
Object	getHandle() returns a handle to the data
Object	getObject(String name) returns a value by name
boolean	hasData() returns true, if data is available, otherwise false

Methods inherited from class java.lang.Object

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

Constructor Detail

PreferencesAccessor

public PreferencesAccessor(PreferencesManager pm,
                           EntityDescriptor ed)

PreferencesAccessor

public PreferencesAccessor(PreferencesManager prefsManager,
                           EntityDescriptor ed,
                           String subPath)

PreferencesAccessor

public PreferencesAccessor(PreferencesManager prefsManager,
                           String nodePath)

Method Detail

close

public void close()

Description copied from interface: DataAccessor

close the data container and free resources

Specified by:

close in interface DataAccessor

entryNames

public Collection<String> entryNames()

Description copied from interface: DataAccessor

returns a list of names, that are known by this data collection

Specified by:

entryNames in interface DataAccessor

Returns:

- a list of names

getHandle

public Object getHandle()

Description copied from interface: DataAccessor

returns a handle to the data

Specified by:

getHandle in interface DataAccessor

Returns:

- a handle to the data

getObject

public Object getObject(String name)

Description copied from interface: DataAccessor

returns a value by name

Specified by:

getObject in interface DataAccessor

Parameters:

name - - name of the value

Returns:

- the value

hasData

public boolean hasData()

Description copied from interface: DataAccessor

returns true, if data is available, otherwise false

Specified by:

hasData in interface DataAccessor

Returns:

- true, if data is available, otherwise false