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jeremybenn |
/* MemoryBasedPreferences - A Preference node which holds all entries in memory
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Copyright (C) 2001, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.util.prefs;
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import java.util.HashMap;
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import java.util.prefs.*;
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/**
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* A Preference node which holds all entries in memory
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*
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* @author Mark Wielaard (mark@klomp.org)
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*/
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public class MemoryBasedPreferences extends AbstractPreferences {
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/** True if this is a preference node in the user tree, false otherwise. */
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private final boolean isUser;
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/** Contains all the preference entries of this node. */
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private HashMap<String, String> entries = new HashMap<String, String>();
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/**
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* Creates a new preferences node with the given name and parent.
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* When isUser is true it will be user node otherwise it will be a system
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* node. It will always set the <code>newNode</code> field to true
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* since there is no real backing store, so all nodes are new.
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*/
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public MemoryBasedPreferences(MemoryBasedPreferences parent,
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String name,
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boolean isUser) {
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super(parent, name);
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this.isUser = isUser;
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// Since we do not have a real backing store all nodes are new
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newNode = true;
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}
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/**
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* Returns true if this node was created as a user node.
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*/
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public boolean isUserNode() {
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return isUser;
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}
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/**
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* Returns an empty array since all children names are always already
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* cached.
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*/
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protected String[] childrenNamesSpi() throws BackingStoreException {
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return new String[0];
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}
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/**
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* Returns a new node with the given name with as parent this node and
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* with the <code>isUser</code> flag set to the same value as this node.
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*/
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protected AbstractPreferences childSpi(String childName) {
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return new MemoryBasedPreferences(this, childName, isUser);
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}
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/**
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* Returns a (possibly empty) array of keys of the preferences entries of
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* this node.
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*/
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protected String[] keysSpi() throws BackingStoreException {
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return entries.keySet().toArray(new String[entries.size()]);
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}
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/**
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* Returns the associated value from this nodes preferences entries or
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* null when the key has not been set.
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*/
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protected String getSpi(String key) {
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return entries.get(key);
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}
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/**
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* Sets the value for the given key.
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*/
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protected void putSpi(String key, String value) {
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entries.put(key, value);
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}
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/**
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* Removes the entry with the given key.
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*/
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protected void removeSpi(String key) {
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entries.remove(key);
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}
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/**
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* Does nothing since we do not have any backing store.
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*/
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protected void flushSpi() {
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}
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/**
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* Does nothing since we do not have any backing store.
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*/
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protected void syncSpi() {
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}
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/**
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* Just removes the entries map of this node.
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*/
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protected void removeNodeSpi() {
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entries = null;
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}
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}
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