Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java @ 875:5e9efdda6894
merged gnv-artifacts/1.0
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:13:56 +0200 |
| parents | d766fe2d917a |
| children | f953c9a559d8 |
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| 722:bb3ffe7d719e | 875:5e9efdda6894 |
|---|---|
| 1 package de.intevation.gnv.raster; | |
| 2 | |
| 3 import java.lang.ref.SoftReference; | |
| 4 | |
| 5 import java.util.HashMap; | |
| 6 | |
| 7 /** | |
| 8 * Manages palettes by their name. Provides different levels of | |
| 9 * subdivisions. | |
| 10 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 11 */ | |
| 12 public class PaletteManager | |
| 13 { | |
| 14 /** | |
| 15 * The base palette. | |
| 16 */ | |
| 17 protected Palette base; | |
| 18 | |
| 19 /** | |
| 20 * The description of the palette. | |
| 21 */ | |
| 22 protected String description; | |
| 23 | |
| 24 /** | |
| 25 * The name of the palette. | |
| 26 */ | |
| 27 protected String name; | |
| 28 | |
| 29 /** | |
| 30 * Already created subdivisions of the palette. | |
| 31 */ | |
| 32 protected HashMap<Integer, SoftReference<Palette>> levels; | |
| 33 | |
| 34 /** | |
| 35 * Default constructor. | |
| 36 */ | |
| 37 public PaletteManager() { | |
| 38 } | |
| 39 | |
| 40 /** | |
| 41 * Constructor to create a palette manager with a given name, | |
| 42 * description and base palette. | |
| 43 * @param name The name. | |
| 44 * @param description The description. | |
| 45 * @param base The base palette. | |
| 46 */ | |
| 47 public PaletteManager( | |
| 48 String name, | |
| 49 String description, | |
| 50 Palette base | |
| 51 ) { | |
| 52 this.name = name; | |
| 53 this.description = description; | |
| 54 this.base = base; | |
| 55 levels = new HashMap<Integer, SoftReference<Palette>>(); | |
| 56 } | |
| 57 | |
| 58 /** | |
| 59 * Returns the description of the palette. | |
| 60 * @return The description. | |
| 61 */ | |
| 62 public String getDescription() { | |
| 63 return description; | |
| 64 } | |
| 65 | |
| 66 /** | |
| 67 * The name of the palette. | |
| 68 * @return The name. | |
| 69 */ | |
| 70 public String getName() { | |
| 71 return name; | |
| 72 } | |
| 73 | |
| 74 /** | |
| 75 * Returns the base palette. | |
| 76 * @return The base palette. | |
| 77 */ | |
| 78 public Palette getBase() { | |
| 79 return base; | |
| 80 } | |
| 81 | |
| 82 /** | |
| 83 * Returns the subdivided palette of a given level. | |
| 84 * @param n The level of subdivision. | |
| 85 * @return The subdivided palette. | |
| 86 */ | |
| 87 public Palette getLevel(int n) { | |
| 88 if (n < 2) { | |
| 89 return base; | |
| 90 } | |
| 91 | |
| 92 Integer N = Integer.valueOf(n); | |
| 93 | |
| 94 Palette palette; | |
| 95 | |
| 96 synchronized (levels) { | |
| 97 SoftReference<Palette> ref = levels.get(N); | |
| 98 | |
| 99 if (ref != null && (palette = ref.get()) != null) { | |
| 100 return palette; | |
| 101 } | |
| 102 | |
| 103 palette = base.subdivide(n); | |
| 104 | |
| 105 ref = new SoftReference(palette); | |
| 106 | |
| 107 levels.put(N, ref); | |
| 108 } | |
| 109 | |
| 110 return palette; | |
| 111 } | |
| 112 } | |
| 113 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |