Added MetadataSimple for simple metadata cenarios

src/com/massivecraft/mcore/MetadataSimple.java

@@ -0,0 +1,61 @@
+package com.massivecraft.mcore;
+
+import java.util.List;
+
+import org.bukkit.metadata.MetadataValue;
+import org.bukkit.metadata.MetadataValueAdapter;
+import org.bukkit.metadata.Metadatable;
+import org.bukkit.plugin.Plugin;
+
+public class MetadataSimple extends MetadataValueAdapter
+{
+	// -------------------------------------------- //
+	// FIELDS
+	// -------------------------------------------- //
+	
+	private Object value;
+	
+	// -------------------------------------------- //
+	// CONSTRUCT
+	// -------------------------------------------- //
+	
+	public MetadataSimple(Plugin plugin, Object value)
+	{
+		super(plugin);
+		this.value = value;
+	}
+
+	// -------------------------------------------- //
+	// CONSTRUCT
+	// -------------------------------------------- //
+	
+	@Override
+	public Object value()
+	{
+		return this.value;
+	}
+
+	@Override
+	public void invalidate()
+	{
+		// This can not be invalidated
+	}
+
+	// -------------------------------------------- //
+	// UTIL
+	// -------------------------------------------- //
+	
+	public static void set(Plugin plugin, Metadatable metadatable, String key, Object value)
+	{
+		metadatable.setMetadata(key, new MetadataSimple(plugin, value));
+	}
+	
+	public static Object get(Metadatable metadatable, String key)
+	{
+		List<MetadataValue> metaValues = metadatable.getMetadata(key);
+		if (metaValues == null) return null;
+		if (metaValues.size() < 1) return null;
+		return metaValues.get(0).value();
+	}
+	
+}