Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java @ 458:92d6cf448598

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Improved raster tile based height evaluation. gnv-artifacts/trunk@512 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 06 Jan 2010 10:09:51 +0000
parents f42ed4f10b79
children b1f5f2a8840f
rev   line source
438
7399bb8f83ea Added manager to handle several levels of palette subdivsions.
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1 package de.intevation.gnv.raster;
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2
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3 import java.util.HashMap;
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4
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5 import java.lang.ref.SoftReference;
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6
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7 /**
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8 * @author Sascha L. Teichmann (sascha.teichmann@intevation.de)
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9 */
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10 public class PaletteManager
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11 {
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12 protected Palette base;
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13
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14 protected String description;
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15 protected String name;
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16
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17 protected HashMap<Integer, SoftReference<Palette>> levels;
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18
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19 public PaletteManager() {
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20 }
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21
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22 public PaletteManager(
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23 String name,
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24 String description,
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25 Palette base
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26 ) {
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27 this.name = name;
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28 this.description = description;
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29 this.base = base;
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30 levels = new HashMap<Integer, SoftReference<Palette>>();
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31 }
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32
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33 public String getDescription() {
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34 return description;
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35 }
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36
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37 public String getName() {
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38 return name;
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39 }
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40
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41 public Palette getBase() {
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42 return base;
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43 }
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44
438
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45 public Palette getLevel(int n) {
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46 if (n < 2) {
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47 return base;
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48 }
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49
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50 Integer N = Integer.valueOf(n);
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51
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52 Palette palette;
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53
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54 synchronized (levels) {
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55 SoftReference<Palette> ref = levels.get(N);
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56
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57 if (ref != null && (palette = ref.get()) != null) {
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58 return palette;
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59 }
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60
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61 palette = base.subdivide(n);
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62
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63 ref = new SoftReference(palette);
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64
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65 levels.put(N, ref);
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66 }
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67
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68 return palette;
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69 }
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70 }
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71 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8:
http://dive4elements.wald.intevation.org