Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java @ 1129:ccfa07b88476

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merged geo-backend
author Thomas Arendsen Hein <thomas@intevation.de>
date Fri, 28 Sep 2012 12:14:01 +0200
parents f953c9a559d8
children
rev   line source
1115
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1 /*
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2 * Copyright (c) 2010 by Intevation GmbH
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3 *
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4 * This program is free software under the LGPL (>=v2.1)
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5 * Read the file LGPL.txt coming with the software for details
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6 * or visit http://www.gnu.org/licenses/ if it does not exist.
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7 */
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8
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9 package de.intevation.gnv.raster;
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10
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11 import java.lang.ref.SoftReference;
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12
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13 import java.util.HashMap;
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14
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15 /**
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16 * Manages palettes by their name. Provides different levels of
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17 * subdivisions.
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18 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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19 */
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20 public class PaletteManager
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21 {
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22 /**
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23 * The base palette.
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24 */
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25 protected Palette base;
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26
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27 /**
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28 * The description of the palette.
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29 */
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30 protected String description;
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31
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32 /**
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33 * The name of the palette.
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34 */
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35 protected String name;
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36
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37 /**
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38 * Already created subdivisions of the palette.
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39 */
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40 protected HashMap<Integer, SoftReference<Palette>> levels;
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41
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42 /**
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43 * Default constructor.
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44 */
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45 public PaletteManager() {
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46 }
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47
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48 /**
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49 * Constructor to create a palette manager with a given name,
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50 * description and base palette.
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51 * @param name The name.
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52 * @param description The description.
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53 * @param base The base palette.
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54 */
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55 public PaletteManager(
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56 String name,
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57 String description,
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58 Palette base
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59 ) {
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60 this.name = name;
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61 this.description = description;
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62 this.base = base;
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63 levels = new HashMap<Integer, SoftReference<Palette>>();
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64 }
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65
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66 /**
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67 * Returns the description of the palette.
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68 * @return The description.
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69 */
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70 public String getDescription() {
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71 return description;
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72 }
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73
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74 /**
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75 * The name of the palette.
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76 * @return The name.
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77 */
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78 public String getName() {
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79 return name;
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80 }
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81
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82 /**
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83 * Returns the base palette.
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84 * @return The base palette.
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85 */
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86 public Palette getBase() {
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87 return base;
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88 }
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89
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90 /**
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91 * Returns the subdivided palette of a given level.
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92 * @param n The level of subdivision.
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93 * @return The subdivided palette.
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94 */
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95 public Palette getLevel(int n) {
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96 if (n < 2) {
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97 return base;
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98 }
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99
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100 Integer N = Integer.valueOf(n);
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101
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102 Palette palette;
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103
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104 synchronized (levels) {
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105 SoftReference<Palette> ref = levels.get(N);
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106
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107 if (ref != null && (palette = ref.get()) != null) {
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108 return palette;
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109 }
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110
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111 palette = base.subdivide(n);
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112
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113 ref = new SoftReference(palette);
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114
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115 levels.put(N, ref);
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116 }
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117
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118 return palette;
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119 }
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120 }
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121 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org