--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java	Fri Sep 28 12:14:00 2012 +0200
@@ -0,0 +1,121 @@
+/*
+ * Copyright (c) 2010 by Intevation GmbH
+ *
+ * This program is free software under the LGPL (>=v2.1)
+ * Read the file LGPL.txt coming with the software for details
+ * or visit http://www.gnu.org/licenses/ if it does not exist.
+ */
+
+package de.intevation.gnv.raster;
+
+import java.lang.ref.SoftReference;
+
+import java.util.HashMap;
+
+/**
+ * Manages palettes by their name. Provides different levels of
+ * subdivisions.
+ * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
+ */
+public class PaletteManager
+{
+    /**
+     * The base palette.
+     */
+    protected Palette base;
+
+    /**
+     * The description of the palette.
+     */
+    protected String  description;
+
+    /**
+     * The name of the palette.
+     */
+    protected String  name;
+
+    /**
+     * Already created subdivisions of the palette.
+     */
+    protected HashMap<Integer, SoftReference<Palette>> levels;
+
+    /**
+     * Default constructor.
+     */
+    public PaletteManager() {
+    }
+
+    /**
+     * Constructor to create a palette manager with a given name,
+     * description and base palette.
+     * @param name The name.
+     * @param description The description.
+     * @param base The base palette.
+     */
+    public PaletteManager(
+        String  name,
+        String  description,
+        Palette base
+    ) {
+        this.name        = name;
+        this.description = description;
+        this.base        = base;
+        levels = new HashMap<Integer, SoftReference<Palette>>();
+    }
+
+    /**
+     * Returns the description of the palette.
+     * @return The description.
+     */
+    public String getDescription() {
+        return description;
+    }
+
+    /**
+     * The name of the palette.
+     * @return The name.
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Returns the base palette.
+     * @return The base palette.
+     */
+    public Palette getBase() {
+        return base;
+    }
+
+    /**
+     * Returns the subdivided palette of a given level.
+     * @param n The level of subdivision.
+     * @return The subdivided palette.
+     */
+    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 :