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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/java/util/prefs/MemoryBasedPreferences.java | |
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Diffstat (limited to 'libjava/classpath/gnu/java/util/prefs/MemoryBasedPreferences.java')
-rw-r--r-- | libjava/classpath/gnu/java/util/prefs/MemoryBasedPreferences.java | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/util/prefs/MemoryBasedPreferences.java b/libjava/classpath/gnu/java/util/prefs/MemoryBasedPreferences.java new file mode 100644 index 000000000..ee184d182 --- /dev/null +++ b/libjava/classpath/gnu/java/util/prefs/MemoryBasedPreferences.java @@ -0,0 +1,144 @@ +/* MemoryBasedPreferences - A Preference node which holds all entries in memory + Copyright (C) 2001, 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.java.util.prefs; + +import java.util.HashMap; + +import java.util.prefs.*; + +/** + * A Preference node which holds all entries in memory + * + * @author Mark Wielaard (mark@klomp.org) + */ +public class MemoryBasedPreferences extends AbstractPreferences { + + /** True if this is a preference node in the user tree, false otherwise. */ + private final boolean isUser; + + /** Contains all the preference entries of this node. */ + private HashMap<String, String> entries = new HashMap<String, String>(); + + /** + * Creates a new preferences node with the given name and parent. + * When isUser is true it will be user node otherwise it will be a system + * node. It will always set the <code>newNode</code> field to true + * since there is no real backing store, so all nodes are new. + */ + public MemoryBasedPreferences(MemoryBasedPreferences parent, + String name, + boolean isUser) { + super(parent, name); + this.isUser = isUser; + + // Since we do not have a real backing store all nodes are new + newNode = true; + } + + /** + * Returns true if this node was created as a user node. + */ + public boolean isUserNode() { + return isUser; + } + + /** + * Returns an empty array since all children names are always already + * cached. + */ + protected String[] childrenNamesSpi() throws BackingStoreException { + return new String[0]; + } + + /** + * Returns a new node with the given name with as parent this node and + * with the <code>isUser</code> flag set to the same value as this node. + */ + protected AbstractPreferences childSpi(String childName) { + return new MemoryBasedPreferences(this, childName, isUser); + } + + /** + * Returns a (possibly empty) array of keys of the preferences entries of + * this node. + */ + protected String[] keysSpi() throws BackingStoreException { + return entries.keySet().toArray(new String[entries.size()]); + } + + /** + * Returns the associated value from this nodes preferences entries or + * null when the key has not been set. + */ + protected String getSpi(String key) { + return entries.get(key); + } + + /** + * Sets the value for the given key. + */ + protected void putSpi(String key, String value) { + entries.put(key, value); + } + + /** + * Removes the entry with the given key. + */ + protected void removeSpi(String key) { + entries.remove(key); + } + + /** + * Does nothing since we do not have any backing store. + */ + protected void flushSpi() { + } + + /** + * Does nothing since we do not have any backing store. + */ + protected void syncSpi() { + } + + /** + * Just removes the entries map of this node. + */ + protected void removeNodeSpi() { + entries = null; + } +} |