Project update.

trunk/java/com/l2jmobius/gameserver/model/variables/AbstractVariables.java

@@ -0,0 +1,132 @@
+/*
+ * This file is part of the L2J Mobius project.
+ * 
+ * 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 com.l2jmobius.gameserver.model.variables;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import com.l2jmobius.gameserver.model.StatsSet;
+import com.l2jmobius.gameserver.model.interfaces.IDeletable;
+import com.l2jmobius.gameserver.model.interfaces.IRestorable;
+import com.l2jmobius.gameserver.model.interfaces.IStorable;
+
+/**
+ * @author UnAfraid
+ */
+public abstract class AbstractVariables extends StatsSet implements IRestorable, IStorable, IDeletable
+{
+	private final AtomicBoolean _hasChanges = new AtomicBoolean(false);
+	
+	/**
+	 * Overriding following methods to prevent from doing useless database operations if there is no changes since player's login.
+	 */
+	
+	@Override
+	public final void set(String name, boolean value)
+	{
+		_hasChanges.compareAndSet(false, true);
+		super.set(name, value);
+	}
+	
+	@Override
+	public final void set(String name, double value)
+	{
+		_hasChanges.compareAndSet(false, true);
+		super.set(name, value);
+	}
+	
+	@Override
+	public final void set(String name, Enum<?> value)
+	{
+		_hasChanges.compareAndSet(false, true);
+		super.set(name, value);
+	}
+	
+	@Override
+	public final void set(String name, int value)
+	{
+		_hasChanges.compareAndSet(false, true);
+		super.set(name, value);
+	}
+	
+	@Override
+	public final void set(String name, long value)
+	{
+		_hasChanges.compareAndSet(false, true);
+		super.set(name, value);
+	}
+	
+	@Override
+	public final void set(String name, String value)
+	{
+		_hasChanges.compareAndSet(false, true);
+		super.set(name, value);
+	}
+	
+	/**
+	 * Put's entry to the variables and marks as changed if required (<i>Useful when restoring to do not save them again</i>).
+	 * @param name
+	 * @param value
+	 * @param markAsChanged
+	 */
+	public final void set(String name, String value, boolean markAsChanged)
+	{
+		if (markAsChanged)
+		{
+			_hasChanges.compareAndSet(false, true);
+		}
+		super.set(name, value);
+	}
+	
+	/**
+	 * Return true if there exists a record for the variable name.
+	 * @param name
+	 * @return
+	 */
+	public boolean hasVariable(String name)
+	{
+		return getSet().keySet().contains(name);
+	}
+	
+	/**
+	 * @return {@code true} if changes are made since last load/save.
+	 */
+	public final boolean hasChanges()
+	{
+		return _hasChanges.get();
+	}
+	
+	/**
+	 * Atomically sets the value to the given updated value if the current value {@code ==} the expected value.
+	 * @param expect
+	 * @param update
+	 * @return {@code true} if successful. {@code false} return indicates that the actual value was not equal to the expected value.
+	 */
+	public final boolean compareAndSetChanges(boolean expect, boolean update)
+	{
+		return _hasChanges.compareAndSet(expect, update);
+	}
+	
+	/**
+	 * Removes variable
+	 * @param name
+	 */
+	public final void remove(String name)
+	{
+		_hasChanges.compareAndSet(false, true);
+		getSet().remove(name);
+	}
+}