1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.gui.mappaint;
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3 |
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4 | import java.util.ArrayList;
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5 | import java.util.Arrays;
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6 | import java.util.Collection;
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7 | import java.util.Iterator;
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8 | import java.util.List;
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9 | import java.util.Objects;
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10 |
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11 | import org.openstreetmap.josm.data.osm.Storage;
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12 | import org.openstreetmap.josm.tools.Pair;
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13 |
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14 | /**
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15 | * Caches styles for a single primitive.
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16 | * Splits the range of possible scale values (0 < scale < +Infinity) into multiple
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17 | * subranges, for each scale range it keeps a list of styles.
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18 | * Immutable class, equals & hashCode is required (the same for StyleList, ElemStyle
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19 | * and its subclasses).
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20 | */
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21 | public final class StyleCache {
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22 | /* list of boundaries for the scale ranges */
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23 | private final List<Double> bd;
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24 | /* styles for each scale range */
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25 | private final List<StyleList> data;
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26 |
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27 | // TODO: clean up the intern pool from time to time (after purge or layer removal)
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28 | private static final Storage<StyleCache> internPool = new Storage<>();
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29 |
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30 | public static final StyleCache EMPTY_STYLECACHE = (new StyleCache()).intern();
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31 |
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32 | private StyleCache() {
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33 | bd = new ArrayList<>();
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34 | bd.add(0.0);
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35 | bd.add(Double.POSITIVE_INFINITY);
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36 | data = new ArrayList<>();
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37 | data.add(null);
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38 | }
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39 |
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40 | private StyleCache(StyleCache s) {
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41 | bd = new ArrayList<>(s.bd);
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42 | data = new ArrayList<>(s.data);
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43 | }
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44 |
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45 | /**
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46 | * List of Styles, immutable
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47 | */
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48 | public static class StyleList implements Iterable<ElemStyle> {
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49 | private List<ElemStyle> lst;
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50 |
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51 | /**
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52 | * Constructs a new {@code StyleList}.
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53 | */
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54 | public StyleList() {
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55 | lst = new ArrayList<>();
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56 | }
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57 |
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58 | public StyleList(ElemStyle... init) {
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59 | lst = new ArrayList<>(Arrays.asList(init));
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60 | }
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61 |
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62 | public StyleList(Collection<ElemStyle> sl) {
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63 | lst = new ArrayList<>(sl);
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64 | }
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65 |
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66 | public StyleList(StyleList sl, ElemStyle s) {
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67 | lst = new ArrayList<>(sl.lst);
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68 | lst.add(s);
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69 | }
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70 |
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71 | @Override
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72 | public Iterator<ElemStyle> iterator() {
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73 | return lst.iterator();
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74 | }
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75 |
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76 | public boolean isEmpty() {
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77 | return lst.isEmpty();
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78 | }
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79 |
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80 | public int size() {
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81 | return lst.size();
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82 | }
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83 |
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84 | @Override
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85 | public String toString() {
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86 | return lst.toString();
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87 | }
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88 |
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89 | @Override
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90 | public boolean equals(Object obj) {
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91 | if (obj == null || getClass() != obj.getClass())
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92 | return false;
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93 | final StyleList other = (StyleList) obj;
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94 | return Objects.equals(lst, other.lst);
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95 | }
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96 |
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97 | @Override
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98 | public int hashCode() {
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99 | return lst.hashCode();
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100 | }
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101 | }
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102 |
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103 | /**
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104 | * looks up styles for a certain scale value
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105 | */
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106 | public StyleList get(double scale) {
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107 | if (scale <= 0)
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108 | throw new IllegalArgumentException("scale must be <= 0 but is "+scale);
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109 | for (int i = 0; i < data.size(); ++i) {
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110 | if (bd.get(i) < scale && scale <= bd.get(i+1)) {
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111 | return data.get(i);
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112 | }
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113 | }
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114 | throw new AssertionError();
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115 | }
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116 |
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117 | /**
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118 | * looks up styles for a certain scale value and additionally returns
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119 | * the scale range for the returned styles
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120 | */
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121 | public Pair<StyleList, Range> getWithRange(double scale) {
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122 | if (scale <= 0)
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123 | throw new IllegalArgumentException("scale must be <= 0 but is "+scale);
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124 | for (int i = 0; i < data.size(); ++i) {
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125 | if (bd.get(i) < scale && scale <= bd.get(i+1)) {
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126 | return new Pair<>(data.get(i), new Range(bd.get(i), bd.get(i+1)));
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127 | }
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128 | }
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129 | throw new AssertionError();
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130 | }
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131 |
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132 | public StyleCache put(StyleList sl, Range r) {
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133 | return put(sl, r.getLower(), r.getUpper());
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134 | }
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135 |
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136 | /**
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137 | * add a new styles to the cache. this is only possible, if
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138 | * for this scale range, there is nothing in the cache yet.
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139 | */
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140 | public StyleCache put(StyleList sl, double lower, double upper) {
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141 | StyleCache s = new StyleCache(this);
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142 | s.putImpl(sl, lower, upper);
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143 | s.consistencyTest();
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144 | return s.intern();
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145 | }
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146 |
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147 | // this exception type is for debugging #8997 and can later be replaced
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148 | // by AssertionError
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149 | public static class RangeViolatedError extends Error {
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150 | public RangeViolatedError() {
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151 | }
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152 |
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153 | public RangeViolatedError(String message) {
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154 | super(message);
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155 | }
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156 | }
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157 |
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158 | /**
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159 | * ASCII-art explanation:
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160 | *
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161 | * data[i]
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162 | * --|-------|---------|--
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163 | * bd[i-1] bd[i] bd[i+1]
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164 | *
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165 | * (--------]
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166 | * lower upper
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167 | */
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168 | private void putImpl(StyleList sl, double lower, double upper) {
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169 | int i = 0;
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170 | while (bd.get(i) < lower) {
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171 | ++i;
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172 | }
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173 | if (bd.get(i) == lower) {
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174 | if (upper > bd.get(i+1))
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175 | throw new RangeViolatedError("the new range must be within a single subrange (1)");
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176 | if (data.get(i) != null)
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177 | throw new RangeViolatedError("the new range must be within a subrange that has no data");
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178 |
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179 | if (bd.get(i+1) == upper) {
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180 | // --|-------|--------|--
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181 | // i-1 i i+1
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182 | // (--------]
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183 | data.set(i, sl);
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184 | } else {
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185 | // --|-------|--------|--
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186 | // i-1 i i+1
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187 | // (-----]
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188 | bd.add(i+1, upper);
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189 | data.add(i, sl);
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190 | }
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191 | return;
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192 | } else {
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193 | if (bd.get(i) < upper)
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194 | throw new RangeViolatedError("the new range must be within a single subrange (2)");
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195 | if (data.get(i-1) != null)
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196 | throw new AssertionError();
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197 |
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198 | // --|-------|--------|--
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199 | // i-1 i i+1
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200 | // (--] or
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201 | // (----]
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202 | bd.add(i, lower);
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203 | data.add(i, sl);
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204 |
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205 | // --|--|----|--------|--
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206 | // i-1 i i+1 i+2
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207 | // (--]
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208 | if (bd.get(i+1) > upper) {
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209 | bd.add(i+1, upper);
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210 | data.add(i+1, null);
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211 | }
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212 | return;
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213 | }
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214 | }
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215 |
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216 | public void consistencyTest() {
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217 | if (bd.size() < 2) throw new AssertionError(bd);
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218 | if (data.isEmpty()) throw new AssertionError(data);
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219 | if (bd.size() != data.size() + 1) throw new AssertionError();
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220 | if (bd.get(0) != 0) throw new AssertionError();
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221 | if (bd.get(bd.size() - 1) != Double.POSITIVE_INFINITY) throw new AssertionError();
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222 | for (int i = 0; i < data.size() - 1; ++i) {
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223 | if (bd.get(i) >= bd.get(i + 1)) throw new AssertionError();
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224 | }
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225 | }
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226 |
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227 | /**
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228 | * Like String.intern() (reduce memory consumption).
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229 | * StyleCache must not be changed after it has
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230 | * been added to the intern pool.
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231 | */
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232 | public StyleCache intern() {
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233 | return internPool.putUnique(this);
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234 | }
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235 |
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236 | @Override
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237 | public boolean equals(Object obj) {
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238 | if (obj == null || getClass() != obj.getClass())
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239 | return false;
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240 | final StyleCache other = (StyleCache) obj;
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241 | return bd.equals(other.bd) && data.equals(other.data);
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242 | }
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243 |
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244 | @Override
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245 | public int hashCode() {
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246 | int hash = 7;
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247 | hash = 23 * hash + bd.hashCode();
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248 | hash = 23 * hash + data.hashCode();
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249 | return hash;
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250 | }
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251 |
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252 | @Override
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253 | public String toString() {
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254 | return "SC{" + bd + ' ' + data + '}';
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255 | }
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256 | }
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