Add in-memory implementation of Sone database.

diff --git a/src/main/java/net/pterodactylus/sone/database/memory/MemorySoneDatabase.java b/src/main/java/net/pterodactylus/sone/database/memory/MemorySoneDatabase.java
new file mode 100644 (file)
index 0000000..0bdf02b
--- /dev/null
+++ b/src/main/java/net/pterodactylus/sone/database/memory/MemorySoneDatabase.java
@@ -0,0 +1,66 @@
+/*
+ * Sone - MemorySoneDatabase.java - Copyright © 2011 David Roden
+ *
+ * This program 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package net.pterodactylus.sone.database.memory;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import net.pterodactylus.sone.core.Core;
+import net.pterodactylus.sone.data.Sone;
+import net.pterodactylus.sone.database.DatabaseException;
+import net.pterodactylus.sone.database.SoneDatabase;
+import net.pterodactylus.util.validation.Validation;
+
+/**
+ * In-memory implementation of {@link SoneDatabase} that stores all its data in
+ * a {@link Map}. This is roughly equivalent to what {@link Core} does today and
+ * is mainly used while Sone is transitioning to using a real database.
+ *
+ * @author <a href="mailto:bombe@pterodactylus.net">David ‘Bombe’ Roden</a>
+ */
+public class MemorySoneDatabase implements SoneDatabase {
+
+       /** The Sones. */
+       private final Map<String, Sone> sones = new HashMap<String, Sone>();
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public Sone getSone(String id, boolean create) throws DatabaseException {
+               Validation.begin().isNotNull("Sone ID", id).check();
+               synchronized (sones) {
+                       if (!sones.containsKey(id)) {
+                               sones.put(id, new Sone(id));
+                       }
+                       return sones.get(id);
+               }
+       }
+
+       /**
+        * {@inheritDoc}
+        */
+       @Override
+       public void saveSone(Sone sone) throws DatabaseException {
+               synchronized (sones) {
+                       Validation.begin().isNotNull("Sone", sone).check().is("Sone is an in-memory Sone", sones.containsKey(sone.getId())).check();
+               }
+               /* this is a no-op. */
+       }
+
+}