Mercurial > dive4elements > gnv-client
comparison gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java @ 1119:7c4f81f74c47
merged gnv-artifacts
| author | Thomas Arendsen Hein <thomas@intevation.de> |
|---|---|
| date | Fri, 28 Sep 2012 12:14:00 +0200 |
| parents | f953c9a559d8 |
| children |
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| 1027:fca4b5eb8d2f | 1119:7c4f81f74c47 |
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| 1 /* | |
| 2 * Copyright (c) 2010 by Intevation GmbH | |
| 3 * | |
| 4 * This program is free software under the LGPL (>=v2.1) | |
| 5 * Read the file LGPL.txt coming with the software for details | |
| 6 * or visit http://www.gnu.org/licenses/ if it does not exist. | |
| 7 */ | |
| 8 | |
| 9 package de.intevation.gnv.raster; | |
| 10 | |
| 11 import java.lang.ref.SoftReference; | |
| 12 | |
| 13 import java.util.HashMap; | |
| 14 | |
| 15 /** | |
| 16 * Manages palettes by their name. Provides different levels of | |
| 17 * subdivisions. | |
| 18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a> | |
| 19 */ | |
| 20 public class PaletteManager | |
| 21 { | |
| 22 /** | |
| 23 * The base palette. | |
| 24 */ | |
| 25 protected Palette base; | |
| 26 | |
| 27 /** | |
| 28 * The description of the palette. | |
| 29 */ | |
| 30 protected String description; | |
| 31 | |
| 32 /** | |
| 33 * The name of the palette. | |
| 34 */ | |
| 35 protected String name; | |
| 36 | |
| 37 /** | |
| 38 * Already created subdivisions of the palette. | |
| 39 */ | |
| 40 protected HashMap<Integer, SoftReference<Palette>> levels; | |
| 41 | |
| 42 /** | |
| 43 * Default constructor. | |
| 44 */ | |
| 45 public PaletteManager() { | |
| 46 } | |
| 47 | |
| 48 /** | |
| 49 * Constructor to create a palette manager with a given name, | |
| 50 * description and base palette. | |
| 51 * @param name The name. | |
| 52 * @param description The description. | |
| 53 * @param base The base palette. | |
| 54 */ | |
| 55 public PaletteManager( | |
| 56 String name, | |
| 57 String description, | |
| 58 Palette base | |
| 59 ) { | |
| 60 this.name = name; | |
| 61 this.description = description; | |
| 62 this.base = base; | |
| 63 levels = new HashMap<Integer, SoftReference<Palette>>(); | |
| 64 } | |
| 65 | |
| 66 /** | |
| 67 * Returns the description of the palette. | |
| 68 * @return The description. | |
| 69 */ | |
| 70 public String getDescription() { | |
| 71 return description; | |
| 72 } | |
| 73 | |
| 74 /** | |
| 75 * The name of the palette. | |
| 76 * @return The name. | |
| 77 */ | |
| 78 public String getName() { | |
| 79 return name; | |
| 80 } | |
| 81 | |
| 82 /** | |
| 83 * Returns the base palette. | |
| 84 * @return The base palette. | |
| 85 */ | |
| 86 public Palette getBase() { | |
| 87 return base; | |
| 88 } | |
| 89 | |
| 90 /** | |
| 91 * Returns the subdivided palette of a given level. | |
| 92 * @param n The level of subdivision. | |
| 93 * @return The subdivided palette. | |
| 94 */ | |
| 95 public Palette getLevel(int n) { | |
| 96 if (n < 2) { | |
| 97 return base; | |
| 98 } | |
| 99 | |
| 100 Integer N = Integer.valueOf(n); | |
| 101 | |
| 102 Palette palette; | |
| 103 | |
| 104 synchronized (levels) { | |
| 105 SoftReference<Palette> ref = levels.get(N); | |
| 106 | |
| 107 if (ref != null && (palette = ref.get()) != null) { | |
| 108 return palette; | |
| 109 } | |
| 110 | |
| 111 palette = base.subdivide(n); | |
| 112 | |
| 113 ref = new SoftReference(palette); | |
| 114 | |
| 115 levels.put(N, ref); | |
| 116 } | |
| 117 | |
| 118 return palette; | |
| 119 } | |
| 120 } | |
| 121 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 : |