1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data;
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3 |
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4 | import java.io.StringReader;
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5 | import java.io.StringWriter;
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6 | import java.lang.annotation.Retention;
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7 | import java.lang.annotation.RetentionPolicy;
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8 | import java.lang.reflect.Field;
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9 | import java.util.ArrayList;
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10 | import java.util.Collection;
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11 | import java.util.Collections;
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12 | import java.util.HashMap;
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13 | import java.util.LinkedHashMap;
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14 | import java.util.List;
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15 | import java.util.Map;
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16 | import java.util.Objects;
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17 | import java.util.Optional;
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18 | import java.util.Set;
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19 | import java.util.stream.Collectors;
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20 |
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21 | import javax.json.Json;
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22 | import javax.json.JsonArray;
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23 | import javax.json.JsonArrayBuilder;
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24 | import javax.json.JsonObject;
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25 | import javax.json.JsonObjectBuilder;
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26 | import javax.json.JsonReader;
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27 | import javax.json.JsonString;
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28 | import javax.json.JsonValue;
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29 | import javax.json.JsonWriter;
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30 |
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31 | import org.openstreetmap.josm.spi.preferences.IPreferences;
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32 | import org.openstreetmap.josm.tools.JosmRuntimeException;
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33 | import org.openstreetmap.josm.tools.Logging;
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34 | import org.openstreetmap.josm.tools.MultiMap;
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35 | import org.openstreetmap.josm.tools.Utils;
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36 |
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37 | /**
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38 | * Utility methods to convert struct-like classes to a string map and back.
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39 | *
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40 | * A "struct" is a class that has some fields annotated with {@link StructEntry}.
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41 | * Those fields will be respected when converting an object to a {@link Map} and back.
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42 | * @since 12851
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43 | */
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44 | public final class StructUtils {
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45 |
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46 | private StructUtils() {
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47 | // hide constructor
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48 | }
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49 |
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50 | /**
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51 | * Annotation used for converting objects to String Maps and vice versa.
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52 | * Indicates that a certain field should be considered in the conversion process. Otherwise it is ignored.
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53 | *
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54 | * @see #serializeStruct(java.lang.Object, java.lang.Class)
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55 | * @see #deserializeStruct(java.util.Map, java.lang.Class)
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56 | */
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57 | @Retention(RetentionPolicy.RUNTIME) // keep annotation at runtime
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58 | public @interface StructEntry { }
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59 |
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60 | /**
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61 | * Annotation used for converting objects to String Maps.
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62 | * Indicates that a certain field should be written to the map, even if the value is the same as the default value.
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63 | *
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64 | * @see #serializeStruct(java.lang.Object, java.lang.Class)
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65 | */
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66 | @Retention(RetentionPolicy.RUNTIME) // keep annotation at runtime
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67 | public @interface WriteExplicitly { }
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68 |
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69 | /**
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70 | * Get a list of hashes which are represented by a struct-like class.
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71 | * Possible properties are given by fields of the class klass that have the @StructEntry annotation.
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72 | * Default constructor is used to initialize the struct objects, properties then override some of these default values.
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73 | * @param <T> klass type
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74 | * @param preferences preferences to look up the value
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75 | * @param key main preference key
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76 | * @param klass The struct class
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77 | * @return a list of objects of type T or an empty list if nothing was found
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78 | */
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79 | public static <T> List<T> getListOfStructs(IPreferences preferences, String key, Class<T> klass) {
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80 | return Optional.ofNullable(getListOfStructs(preferences, key, null, klass)).orElseGet(Collections::emptyList);
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81 | }
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82 |
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83 | /**
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84 | * same as above, but returns def if nothing was found
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85 | * @param <T> klass type
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86 | * @param preferences preferences to look up the value
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87 | * @param key main preference key
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88 | * @param def default value
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89 | * @param klass The struct class
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90 | * @return a list of objects of type T or {@code def} if nothing was found
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91 | */
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92 | public static <T> List<T> getListOfStructs(IPreferences preferences, String key, Collection<T> def, Class<T> klass) {
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93 | List<Map<String, String>> prop =
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94 | preferences.getListOfMaps(key, def == null ? null : serializeListOfStructs(def, klass));
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95 | if (prop == null)
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96 | return def == null ? null : new ArrayList<>(def);
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97 | return prop.stream().map(p -> deserializeStruct(p, klass)).collect(Collectors.toList());
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98 | }
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99 |
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100 | /**
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101 | * Convenience method that saves a MapListSetting which is provided as a collection of objects.
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102 | *
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103 | * Each object is converted to a <code>Map<String, String></code> using the fields with {@link StructEntry} annotation.
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104 | * The field name is the key and the value will be converted to a string.
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105 | *
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106 | * Considers only fields that have the {@code @StructEntry} annotation.
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107 | * In addition it does not write fields with null values. (Thus they are cleared)
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108 | * Default values are given by the field values after default constructor has been called.
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109 | * Fields equal to the default value are not written unless the field has the {@link WriteExplicitly} annotation.
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110 | * @param <T> the class,
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111 | * @param preferences the preferences to save to
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112 | * @param key main preference key
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113 | * @param val the list that is supposed to be saved
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114 | * @param klass The struct class
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115 | * @return true if something has changed
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116 | */
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117 | public static <T> boolean putListOfStructs(IPreferences preferences, String key, Collection<T> val, Class<T> klass) {
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118 | return preferences.putListOfMaps(key, serializeListOfStructs(val, klass));
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119 | }
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120 |
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121 | private static <T> List<Map<String, String>> serializeListOfStructs(Collection<T> l, Class<T> klass) {
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122 | if (l == null)
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123 | return null;
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124 | List<Map<String, String>> vals = new ArrayList<>();
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125 | for (T struct : l) {
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126 | if (struct != null) {
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127 | vals.add(serializeStruct(struct, klass));
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128 | }
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129 | }
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130 | return vals;
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131 | }
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132 |
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133 | /**
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134 | * Convert an object to a String Map, by using field names and values as map key and value.
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135 | *
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136 | * The field value is converted to a String.
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137 | *
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138 | * Only fields with annotation {@link StructEntry} are taken into account.
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139 | *
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140 | * Fields will not be written to the map if the value is null or unchanged
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141 | * (compared to an object created with the no-arg-constructor).
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142 | * The {@link WriteExplicitly} annotation overrides this behavior, i.e. the default value will also be written.
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143 | *
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144 | * @param <T> the class of the object <code>struct</code>
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145 | * @param struct the object to be converted
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146 | * @param klass the class T
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147 | * @return the resulting map (same data content as <code>struct</code>)
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148 | */
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149 | public static <T> Map<String, String> serializeStruct(T struct, Class<T> klass) {
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150 | T structPrototype;
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151 | try {
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152 | structPrototype = klass.getConstructor().newInstance();
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153 | } catch (ReflectiveOperationException ex) {
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154 | throw new IllegalArgumentException(ex);
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155 | }
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156 |
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157 | Map<String, String> hash = new LinkedHashMap<>();
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158 | for (Field f : klass.getDeclaredFields()) {
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159 | if (f.getAnnotation(StructEntry.class) == null) {
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160 | continue;
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161 | }
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162 | try {
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163 | Utils.setObjectsAccessible(f);
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164 | Object fieldValue = f.get(struct);
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165 | Object defaultFieldValue = f.get(structPrototype);
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166 | if (fieldValue != null && (
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167 | f.getAnnotation(WriteExplicitly.class) != null ||
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168 | !Objects.equals(fieldValue, defaultFieldValue))) {
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169 | String key = f.getName().replace('_', '-');
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170 | if (fieldValue instanceof Map) {
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171 | hash.put(key, mapToJson((Map<?, ?>) fieldValue));
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172 | } else if (fieldValue instanceof MultiMap) {
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173 | hash.put(key, multiMapToJson((MultiMap<?, ?>) fieldValue));
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174 | } else {
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175 | hash.put(key, fieldValue.toString());
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176 | }
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177 | }
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178 | } catch (IllegalAccessException | SecurityException ex) {
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179 | throw new JosmRuntimeException(ex);
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180 | }
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181 | }
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182 | return hash;
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183 | }
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184 |
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185 | /**
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186 | * Converts a String-Map to an object of a certain class, by comparing map keys to field names of the class and assigning
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187 | * map values to the corresponding fields.
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188 | *
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189 | * The map value (a String) is converted to the field type. Supported types are: boolean, Boolean, int, Integer, double,
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190 | * Double, String, Map<String, String> and Map<String, List<String>>.
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191 | *
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192 | * Only fields with annotation {@link StructEntry} are taken into account.
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193 | * @param <T> the class
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194 | * @param hash the string map with initial values
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195 | * @param klass the class T
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196 | * @return an object of class T, initialized as described above
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197 | */
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198 | public static <T> T deserializeStruct(Map<String, String> hash, Class<T> klass) {
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199 | T struct = null;
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200 | try {
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201 | struct = klass.getConstructor().newInstance();
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202 | } catch (ReflectiveOperationException ex) {
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203 | throw new IllegalArgumentException(ex);
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204 | }
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205 | for (Map.Entry<String, String> keyValue : hash.entrySet()) {
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206 | Object value;
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207 | Field f;
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208 | try {
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209 | f = klass.getDeclaredField(keyValue.getKey().replace('-', '_'));
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210 | } catch (NoSuchFieldException ex) {
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211 | Logging.trace(ex);
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212 | continue;
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213 | }
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214 | if (f.getAnnotation(StructEntry.class) == null) {
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215 | continue;
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216 | }
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217 | Utils.setObjectsAccessible(f);
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218 | if (f.getType() == Boolean.class || f.getType() == boolean.class) {
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219 | value = Boolean.valueOf(keyValue.getValue());
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220 | } else if (f.getType() == Integer.class || f.getType() == int.class) {
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221 | try {
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222 | value = Integer.valueOf(keyValue.getValue());
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223 | } catch (NumberFormatException nfe) {
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224 | continue;
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225 | }
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226 | } else if (f.getType() == Double.class || f.getType() == double.class) {
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227 | try {
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228 | value = Double.valueOf(keyValue.getValue());
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229 | } catch (NumberFormatException nfe) {
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230 | continue;
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231 | }
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232 | } else if (f.getType() == String.class) {
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233 | value = keyValue.getValue();
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234 | } else if (f.getType().isAssignableFrom(Map.class)) {
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235 | value = mapFromJson(keyValue.getValue());
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236 | } else if (f.getType().isAssignableFrom(MultiMap.class)) {
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237 | value = multiMapFromJson(keyValue.getValue());
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238 | } else
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239 | throw new JosmRuntimeException("unsupported preference primitive type");
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240 |
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241 | try {
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242 | f.set(struct, value);
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243 | } catch (IllegalArgumentException ex) {
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244 | throw new AssertionError(ex);
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245 | } catch (IllegalAccessException ex) {
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246 | throw new JosmRuntimeException(ex);
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247 | }
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248 | }
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249 | return struct;
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250 | }
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251 |
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252 | @SuppressWarnings("rawtypes")
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253 | private static String mapToJson(Map map) {
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254 | StringWriter stringWriter = new StringWriter();
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255 | try (JsonWriter writer = Json.createWriter(stringWriter)) {
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256 | JsonObjectBuilder object = Json.createObjectBuilder();
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257 | for (Object o: map.entrySet()) {
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258 | Map.Entry e = (Map.Entry) o;
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259 | Object evalue = e.getValue();
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260 | object.add(e.getKey().toString(), evalue.toString());
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261 | }
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262 | writer.writeObject(object.build());
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263 | }
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264 | return stringWriter.toString();
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265 | }
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266 |
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267 | @SuppressWarnings({ "rawtypes", "unchecked" })
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268 | private static Map mapFromJson(String s) {
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269 | Map ret = null;
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270 | try (JsonReader reader = Json.createReader(new StringReader(s))) {
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271 | JsonObject object = reader.readObject();
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272 | ret = new HashMap(object.size());
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273 | for (Map.Entry<String, JsonValue> e: object.entrySet()) {
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274 | JsonValue value = e.getValue();
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275 | if (value instanceof JsonString) {
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276 | // in some cases, when JsonValue.toString() is called, then additional quotation marks are left in value
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277 | ret.put(e.getKey(), ((JsonString) value).getString());
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278 | } else {
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279 | ret.put(e.getKey(), e.getValue().toString());
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280 | }
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281 | }
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282 | }
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283 | return ret;
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284 | }
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285 |
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286 | @SuppressWarnings("rawtypes")
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287 | private static String multiMapToJson(MultiMap map) {
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288 | StringWriter stringWriter = new StringWriter();
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289 | try (JsonWriter writer = Json.createWriter(stringWriter)) {
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290 | JsonObjectBuilder object = Json.createObjectBuilder();
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291 | for (Object o: map.entrySet()) {
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292 | Map.Entry e = (Map.Entry) o;
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293 | Set evalue = (Set) e.getValue();
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294 | JsonArrayBuilder a = Json.createArrayBuilder();
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295 | for (Object evo: evalue) {
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296 | a.add(evo.toString());
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297 | }
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298 | object.add(e.getKey().toString(), a.build());
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299 | }
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300 | writer.writeObject(object.build());
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301 | }
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302 | return stringWriter.toString();
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303 | }
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304 |
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305 | @SuppressWarnings({ "rawtypes", "unchecked" })
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306 | private static MultiMap multiMapFromJson(String s) {
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307 | MultiMap ret = null;
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308 | try (JsonReader reader = Json.createReader(new StringReader(s))) {
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309 | JsonObject object = reader.readObject();
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310 | ret = new MultiMap(object.size());
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311 | for (Map.Entry<String, JsonValue> e: object.entrySet()) {
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312 | JsonValue value = e.getValue();
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313 | if (value instanceof JsonArray) {
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314 | for (JsonString js: ((JsonArray) value).getValuesAs(JsonString.class)) {
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315 | ret.put(e.getKey(), js.getString());
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316 | }
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317 | } else if (value instanceof JsonString) {
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318 | // in some cases, when JsonValue.toString() is called, then additional quotation marks are left in value
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319 | ret.put(e.getKey(), ((JsonString) value).getString());
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320 | } else {
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321 | ret.put(e.getKey(), e.getValue().toString());
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322 | }
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323 | }
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324 | }
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325 | return ret;
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326 | }
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327 | }
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