--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java	Mon Dec 28 11:50:27 2009 +0000
@@ -0,0 +1,63 @@
+package de.intevation.gnv.raster;
+
+import java.util.HashMap;
+
+import java.lang.ref.SoftReference;
+
+/**
+ * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
+ */
+public class PaletteManager
+{
+    protected Palette base;
+
+    protected String  description;
+    protected String  name;
+
+    protected HashMap<Integer, SoftReference<Palette>> levels;
+
+    public PaletteManager() {
+    }
+
+    public PaletteManager(
+        String  name,
+        String  description,
+        Palette base
+    ) {
+        this.name        = name;
+        this.description = description;
+        this.base        = base;
+        levels = new HashMap<Integer, SoftReference<Palette>>();
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public Palette getLevel(int n) {
+        if (n < 2) {
+            return base;
+        }
+
+        Integer N = Integer.valueOf(n);
+
+        Palette palette;
+
+        synchronized (levels) {
+            SoftReference<Palette> ref = levels.get(N);
+
+            if (ref != null && (palette = ref.get()) != null) {
+                return palette;
+            }
+
+            palette = base.subdivide(n);
+
+            ref = new SoftReference(palette);
+
+            levels.put(N, ref);
+        }
+
+        return palette;
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: