Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java @ 438:7399bb8f83ea
Added manager to handle several levels of palette subdivsions.
Added parameter ids to identify the palette associated with a parameter
gnv-artifacts/trunk@486 c6561f87-3c4e-4783-a992-168aeb5c3f6f
| author | Sascha L. Teichmann <sascha.teichmann@intevation.de> |
|---|---|
| date | Mon, 28 Dec 2009 11:50:27 +0000 |
| parents | |
| children | f42ed4f10b79 |
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| 437:b624879d2902 | 438:7399bb8f83ea |
|---|---|
| 1 package de.intevation.gnv.raster; | |
| 2 | |
| 3 import java.util.HashMap; | |
| 4 | |
| 5 import java.lang.ref.SoftReference; | |
| 6 | |
| 7 /** | |
| 8 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de) | |
| 9 */ | |
| 10 public class PaletteManager | |
| 11 { | |
| 12 protected Palette base; | |
| 13 | |
| 14 protected String description; | |
| 15 protected String name; | |
| 16 | |
| 17 protected HashMap<Integer, SoftReference<Palette>> levels; | |
| 18 | |
| 19 public PaletteManager() { | |
| 20 } | |
| 21 | |
| 22 public PaletteManager( | |
| 23 String name, | |
| 24 String description, | |
| 25 Palette base | |
| 26 ) { | |
| 27 this.name = name; | |
| 28 this.description = description; | |
| 29 this.base = base; | |
| 30 levels = new HashMap<Integer, SoftReference<Palette>>(); | |
| 31 } | |
| 32 | |
| 33 public String getDescription() { | |
| 34 return description; | |
| 35 } | |
| 36 | |
| 37 public Palette getLevel(int n) { | |
| 38 if (n < 2) { | |
| 39 return base; | |
| 40 } | |
| 41 | |
| 42 Integer N = Integer.valueOf(n); | |
| 43 | |
| 44 Palette palette; | |
| 45 | |
| 46 synchronized (levels) { | |
| 47 SoftReference<Palette> ref = levels.get(N); | |
| 48 | |
| 49 if (ref != null && (palette = ref.get()) != null) { | |
| 50 return palette; | |
| 51 } | |
| 52 | |
| 53 palette = base.subdivide(n); | |
| 54 | |
| 55 ref = new SoftReference(palette); | |
| 56 | |
| 57 levels.put(N, ref); | |
| 58 } | |
| 59 | |
| 60 return palette; | |
| 61 } | |
| 62 } | |
| 63 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8: |