This
class
implements all the abstract methods of Preferences
on top of a smaller set of abstract methods. Programmers creating a
Preferences implementation (or "service
provider") can subclass this class and need define
only the nine methods whose names end in
"Spi". Application programmers
never need to use this class.
Figure 16-124. java.util.prefs.AbstractPreferences
public abstract class
AbstractPreferences extends Preferences {
// Protected Constructors
protected
AbstractPreferences (AbstractPreferences
parent , String
name );
// Event Registration Methods (by event name)
public void
addNodeChangeListener (NodeChangeListener
ncl );
Overrides:Preferences
public void
removeNodeChangeListener (NodeChangeListener
ncl );
Overrides:Preferences
public void
addPreferenceChangeListener (PreferenceChangeListener
pcl );
Overrides:Preferences
public void
removePreferenceChangeListener (PreferenceChangeListener
pcl );
Overrides:Preferences
// Public Methods Overriding Preferences
public String
absolutePath ( );
public String[ ]
childrenNames ( ) throws BackingStoreException;
public void
clear ( ) throws BackingStoreException;
public void
exportNode (java.io.OutputStream
os ) throws java.io.IOException,
BackingStoreException;
public void
exportSubtree (java.io.OutputStream
os ) throws java.io.IOException,
BackingStoreException;
public void
flush ( ) throws BackingStoreException;
public String
get (String
key , String
def );
public boolean
getBoolean (String
key , boolean
def );
public byte[ ]
getByteArray (String
key , byte[ ]
def );
public double
getDouble (String
key , double
def );
public float
getFloat (String
key , float
def );
public int
getInt (String
key , int
def );
public long
getLong (String
key , long
def );
public boolean
isUserNode ( );
public String[ ]
keys ( ) throws BackingStoreException;
public String
name ( );
public Preferences
node (String
path );
public boolean
nodeExists (String
path ) throws BackingStoreException;
public Preferences
parent ( );
public void
put (String
key , String
value );
public void
putBoolean (String
key , boolean
value );
public void
putByteArray (String
key , byte[ ]
value );
public void
putDouble (String
key , double
value );
public void
putFloat (String
key , float
value );
public void
putInt (String
key , int
value );
public void
putLong (String
key , long
value );
public void
remove (String
key );
public void
removeNode ( ) throws BackingStoreException;
public void
sync ( ) throws BackingStoreException;
public String
toString ( );
// Protected Instance Methods
protected final AbstractPreferences[ ]
cachedChildren ( );
protected abstract String[ ]
childrenNamesSpi ( ) throws BackingStoreException;
protected abstract AbstractPreferences
childSpi (String
name );
protected abstract void
flushSpi ( ) throws BackingStoreException;
protected AbstractPreferences
getChild (String
nodeName ) throws BackingStoreException;
protected abstract String
getSpi (String
key );
protected boolean
isRemoved ( );
protected abstract String[ ]
keysSpi ( ) throws BackingStoreException;
protected abstract void
putSpi (String
key , String
value );
protected abstract void
removeNodeSpi ( ) throws BackingStoreException;
protected abstract void
removeSpi (String
key );
protected abstract void
syncSpi ( ) throws BackingStoreException;
// Protected Instance Fields
protected final Object
lock ;
protected boolean
newNode ;
}