1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.tools;
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3 |
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4 | import java.util.Collection;
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5 | import java.util.Objects;
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6 | import java.util.regex.Pattern;
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7 |
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8 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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9 |
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10 | /**
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11 | * Utility class for creating {@link Predicate}s.
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12 | */
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13 | public final class Predicates {
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14 |
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15 | private Predicates() {
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16 | }
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17 |
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18 | /**
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19 | * Creates a predicate that returns true every time.
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20 | * @param <T> The type of the predicate.
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21 | * @return A predicate returning <code>true</code>
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22 | * @since 10040
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23 | */
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24 | public static <T> Predicate<T> alwaysTrue() {
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25 | return new Predicate<T>() {
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26 | @Override
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27 | public boolean evaluate(T object) {
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28 | return true;
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29 | }
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30 | };
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31 | }
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32 |
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33 | /**
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34 | * Creates a predicate that returns false every time.
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35 | * @param <T> The type of the predicate.
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36 | * @return A predicate returning <code>false</code>
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37 | * @since 10040
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38 | */
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39 | public static <T> Predicate<T> alwaysFalse() {
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40 | return new Predicate<T>() {
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41 | @Override
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42 | public boolean evaluate(T object) {
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43 | return false;
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44 | }
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45 | };
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46 | }
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47 |
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48 | /**
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49 | * Returns the negation of {@code predicate}.
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50 | * @param <T> type of items
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51 | * @param predicate the predicate to negate
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52 | * @return the negation of {@code predicate}
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53 | */
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54 | public static <T> Predicate<T> not(final Predicate<T> predicate) {
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55 | return new Predicate<T>() {
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56 | @Override
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57 | public boolean evaluate(T obj) {
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58 | return !predicate.evaluate(obj);
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59 | }
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60 | };
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61 | }
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62 |
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63 | /**
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64 | * Returns a {@link Predicate} executing {@link Objects#equals}.
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65 | * @param <T> type of items
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66 | * @param ref the reference object
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67 | * @return a {@link Predicate} executing {@link Objects#equals}
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68 | */
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69 | public static <T> Predicate<T> equalTo(final T ref) {
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70 | return new Predicate<T>() {
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71 | @Override
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72 | public boolean evaluate(T obj) {
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73 | return Objects.equals(obj, ref);
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74 | }
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75 | };
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76 | }
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77 |
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78 | /**
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79 | * Creates a new predicate that checks if elements are exactly of that class.
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80 | * @param <T> The predicate type.
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81 | * @param clazz The class the elements must have.
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82 | * @return A predicate.
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83 | */
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84 | public static <T> Predicate<T> isOfClass(final Class<? extends T> clazz) {
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85 | return new Predicate<T>() {
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86 | @Override
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87 | public boolean evaluate(T obj) {
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88 | return obj != null && obj.getClass() == clazz;
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89 | }
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90 | };
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91 | }
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92 |
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93 | /**
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94 | * Returns a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#matches}.
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95 | * @param pattern the pattern
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96 | * @return a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#matches}
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97 | */
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98 | public static Predicate<String> stringMatchesPattern(final Pattern pattern) {
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99 | return new Predicate<String>() {
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100 | @Override
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101 | public boolean evaluate(String string) {
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102 | return pattern.matcher(string).matches();
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103 | }
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104 | };
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105 | }
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106 |
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107 | /**
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108 | * Returns a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#find}.
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109 | * @param pattern the pattern
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110 | * @return a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#find}
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111 | */
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112 | public static Predicate<String> stringContainsPattern(final Pattern pattern) {
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113 | return new Predicate<String>() {
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114 | @Override
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115 | public boolean evaluate(String string) {
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116 | return pattern.matcher(string).find();
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117 | }
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118 | };
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119 | }
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120 |
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121 | /**
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122 | * Returns a {@link Predicate} executing {@link String#contains(CharSequence)}.
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123 | * @param pattern the pattern
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124 | * @return a {@link Predicate} executing {@link String#contains(CharSequence)}
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125 | */
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126 | public static Predicate<String> stringContains(final String pattern) {
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127 | return new Predicate<String>() {
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128 | @Override
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129 | public boolean evaluate(String string) {
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130 | return string.contains(pattern);
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131 | }
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132 | };
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133 | }
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134 |
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135 | /**
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136 | * Returns a {@link Predicate} executing {@link OsmPrimitive#hasTag(String, String...)}.
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137 | * @param key the key forming the tag
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138 | * @param values one or many values forming the tag
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139 | * @return a {@link Predicate} executing {@link OsmPrimitive#hasTag(String, String...)}
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140 | */
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141 | public static Predicate<OsmPrimitive> hasTag(final String key, final String... values) {
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142 | return new Predicate<OsmPrimitive>() {
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143 | @Override
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144 | public boolean evaluate(OsmPrimitive p) {
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145 | return p.hasTag(key, values);
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146 | }
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147 | };
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148 | }
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149 |
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150 | /**
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151 | * Returns a {@link Predicate} executing {@link OsmPrimitive#hasKey(String)}.
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152 | * @param key the key
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153 | * @return a {@link Predicate} executing {@link OsmPrimitive#hasKey(String)}
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154 | */
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155 | public static Predicate<OsmPrimitive> hasKey(final String key) {
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156 | return new Predicate<OsmPrimitive>() {
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157 | @Override
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158 | public boolean evaluate(OsmPrimitive p) {
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159 | return p.hasKey(key);
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160 | }
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161 | };
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162 | }
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163 |
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164 | /**
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165 | * Returns a {@link Predicate} executing {@link Collection#contains(Object)}.
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166 | * @param <T> type of items
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167 | * @param target collection
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168 | * @return a {@link Predicate} executing {@link Collection#contains(Object)}
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169 | */
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170 | public static <T> Predicate<T> inCollection(final Collection<? extends T> target) {
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171 | return new Predicate<T>() {
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172 | @Override
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173 | public boolean evaluate(T object) {
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174 | return target.contains(object);
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175 | }
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176 | };
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177 | }
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178 |
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179 | /**
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180 | * Returns a {@link Predicate} testing whether objects are {@code null}.
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181 | * @param <T> type of items
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182 | * @return a {@link Predicate} testing whether objects are {@code null}
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183 | */
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184 | public static <T> Predicate<T> isNull() {
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185 | return new Predicate<T>() {
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186 | @Override
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187 | public boolean evaluate(T object) {
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188 | return object == null;
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189 | }
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190 | };
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191 | }
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192 | }
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