Mercurial > dive4elements > gnv-client

annotate gnv-artifacts/src/main/java/de/intevation/gnv/raster/PaletteManager.java @ 1037:da4306683186

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Added queries for TimeSeriesPoints in vectorvalues for TimeSeries gnv-artifacts/trunk@1109 c6561f87-3c4e-4783-a992-168aeb5c3f6f
author Tim Englich <tim.englich@intevation.de>
date Tue, 18 May 2010 14:27:46 +0000
parents d766fe2d917a
children f953c9a559d8
rev   line source
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1 package de.intevation.gnv.raster;
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2
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3 import java.lang.ref.SoftReference;
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4
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5 import java.util.HashMap;
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6
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7 /**
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8 * Manages palettes by their name. Provides different levels of
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9 * subdivisions.
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10 * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
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11 */
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12 public class PaletteManager
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13 {
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14 /**
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15 * The base palette.
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16 */
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17 protected Palette base;
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18
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19 /**
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20 * The description of the palette.
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21 */
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22 protected String description;
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23
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24 /**
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25 * The name of the palette.
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26 */
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27 protected String name;
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28
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29 /**
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30 * Already created subdivisions of the palette.
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31 */
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32 protected HashMap<Integer, SoftReference<Palette>> levels;
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33
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34 /**
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35 * Default constructor.
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36 */
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37 public PaletteManager() {
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38 }
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39
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40 /**
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41 * Constructor to create a palette manager with a given name,
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42 * description and base palette.
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43 * @param name The name.
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44 * @param description The description.
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45 * @param base The base palette.
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46 */
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47 public PaletteManager(
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48 String name,
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49 String description,
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50 Palette base
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51 ) {
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52 this.name = name;
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53 this.description = description;
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54 this.base = base;
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55 levels = new HashMap<Integer, SoftReference<Palette>>();
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56 }
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57
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58 /**
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59 * Returns the description of the palette.
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60 * @return The description.
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61 */
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62 public String getDescription() {
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63 return description;
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64 }
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65
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66 /**
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67 * The name of the palette.
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68 * @return The name.
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69 */
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70 public String getName() {
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71 return name;
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72 }
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73
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74 /**
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75 * Returns the base palette.
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76 * @return The base palette.
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77 */
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78 public Palette getBase() {
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79 return base;
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80 }
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81
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82 /**
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83 * Returns the subdivided palette of a given level.
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84 * @param n The level of subdivision.
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85 * @return The subdivided palette.
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86 */
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87 public Palette getLevel(int n) {
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88 if (n < 2) {
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89 return base;
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90 }
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91
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92 Integer N = Integer.valueOf(n);
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93
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94 Palette palette;
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95
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96 synchronized (levels) {
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97 SoftReference<Palette> ref = levels.get(N);
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98
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99 if (ref != null && (palette = ref.get()) != null) {
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100 return palette;
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101 }
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102
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103 palette = base.subdivide(n);
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104
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105 ref = new SoftReference(palette);
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106
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107 levels.put(N, ref);
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108 }
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109
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110 return palette;
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111 }
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112 }
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113 // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :
http://dive4elements.wald.intevation.org