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1 | package be.nikiroo.utils.serial; |
2 | ||
aad14586 NR |
3 | import java.lang.reflect.Constructor; |
4 | import java.lang.reflect.Field; | |
5 | import java.lang.reflect.InvocationTargetException; | |
db31c358 NR |
6 | import java.io.NotSerializableException; |
7 | import java.lang.reflect.Field; | |
8 | import java.util.HashMap; | |
9 | import java.util.Map; | |
10 | ||
11 | /** | |
12 | * Small class to help serialise/deserialise objects. | |
13 | * <p> | |
14 | * Note that we do not support inner classes (but we do support nested classes) | |
15 | * and all objects require an empty constructor to be deserialised. | |
16 | * | |
17 | * @author niki | |
18 | */ | |
aad14586 | 19 | public class SerialUtils { |
db31c358 NR |
20 | private static Map<String, CustomSerializer> customTypes; |
21 | ||
22 | static { | |
23 | customTypes = new HashMap<String, CustomSerializer>(); | |
24 | // TODO: add "default" custom serialisers | |
25 | } | |
aad14586 NR |
26 | |
27 | /** | |
28 | * Create an empty object of the given type. | |
29 | * | |
30 | * @param type | |
31 | * the object type (its class name) | |
32 | * | |
33 | * @return the new object | |
34 | * | |
35 | * @throws NoSuchMethodException if the given class is not compatible with this code | |
36 | * @throws ClassNotFoundException if the class cannot be found or created | |
37 | */ | |
38 | public static Object createObject(String type) throws NoSuchMethodException, | |
39 | ClassNotFoundException { | |
40 | ||
41 | try { | |
42 | Class<?> clazz = getClass(type); | |
43 | if (clazz == null) { | |
44 | throw new ClassNotFoundException("Class not found: " + type); | |
45 | } | |
46 | ||
47 | String className = clazz.getName(); | |
48 | Object[] args = null; | |
49 | Constructor<?> ctor = null; | |
50 | if (className.contains("$")) { | |
51 | Object javaParent = createObject(className.substring(0, | |
52 | className.lastIndexOf('$'))); | |
53 | args = new Object[] { javaParent }; | |
54 | ctor = clazz.getDeclaredConstructor(new Class[] { javaParent | |
55 | .getClass() }); | |
56 | } else { | |
57 | args = new Object[] {}; | |
58 | ctor = clazz.getDeclaredConstructor(); | |
59 | } | |
60 | ||
61 | ctor.setAccessible(true); | |
62 | return ctor.newInstance(args); | |
63 | } catch (NoSuchMethodException e) { | |
64 | throw new NoSuchMethodException( | |
65 | String.format( | |
66 | "Objects of type \"%s\" cannot be created by this code: maybe the class" | |
67 | + " or its enclosing class doesn't have an empty constructor?", | |
68 | type)); | |
69 | ||
70 | } | |
71 | catch (SecurityException e) { throw new ClassNotFoundException("Cannot instantiate: " + type, e); } | |
72 | catch (InstantiationException e) { throw new ClassNotFoundException("Cannot instantiate: " + type, e); } | |
73 | catch (IllegalAccessException e) { throw new ClassNotFoundException("Cannot instantiate: " + type, e); } | |
74 | catch (IllegalArgumentException e) { throw new ClassNotFoundException("Cannot instantiate: " + type, e); } | |
75 | catch (InvocationTargetException e) { throw new ClassNotFoundException("Cannot instantiate: " + type, e); } | |
76 | } | |
db31c358 NR |
77 | |
78 | static public void addCustomSerializer(CustomSerializer serializer) { | |
79 | customTypes.put(serializer.getType(), serializer); | |
80 | } | |
81 | ||
82 | static void append(StringBuilder builder, Object o, Map<Integer, Object> map) | |
83 | throws NotSerializableException { | |
84 | ||
85 | Field[] fields = new Field[] {}; | |
86 | String type = ""; | |
87 | String id = "NULL"; | |
88 | ||
89 | if (o != null) { | |
90 | int hash = System.identityHashCode(o); | |
91 | fields = o.getClass().getDeclaredFields(); | |
92 | type = o.getClass().getCanonicalName(); | |
93 | if (type == null) { | |
94 | throw new NotSerializableException( | |
95 | String.format( | |
96 | "Cannot find the class for this object: %s (it could be an inner class, which is not supported)", | |
97 | o)); | |
98 | } | |
99 | id = Integer.toString(hash); | |
100 | if (map.containsKey(hash)) { | |
101 | fields = new Field[] {}; | |
102 | } else { | |
103 | map.put(hash, o); | |
104 | } | |
105 | } | |
106 | ||
107 | builder.append("{\nREF ").append(type).append("@").append(id); | |
108 | try { | |
109 | for (Field field : fields) { | |
110 | field.setAccessible(true); | |
111 | ||
112 | if (field.getName().startsWith("this$")) { | |
113 | // Do not keep this links of nested classes | |
114 | continue; | |
115 | } | |
116 | ||
117 | builder.append("\n"); | |
118 | builder.append(field.getName()); | |
119 | builder.append(":"); | |
120 | Object value; | |
121 | ||
122 | value = field.get(o); | |
123 | ||
124 | if (!encode(builder, value)) { | |
125 | builder.append("\n"); | |
126 | append(builder, value, map); | |
127 | } | |
128 | } | |
129 | } catch (IllegalArgumentException e) { | |
130 | e.printStackTrace(); // should not happen (see setAccessible) | |
131 | } catch (IllegalAccessException e) { | |
132 | e.printStackTrace(); // should not happen (see setAccessible) | |
133 | } | |
134 | builder.append("\n}"); | |
135 | } | |
136 | ||
137 | // return true if encoded (supported) | |
138 | static boolean encode(StringBuilder builder, Object value) { | |
139 | if (value == null) { | |
140 | builder.append("NULL"); | |
141 | } else if (customTypes.containsKey(value.getClass().getCanonicalName())) { | |
142 | customTypes.get(value.getClass().getCanonicalName())// | |
143 | .encode(builder, value); | |
144 | } else if (value instanceof String) { | |
145 | encodeString(builder, (String) value); | |
146 | } else if (value instanceof Boolean) { | |
147 | builder.append(value); | |
148 | } else if (value instanceof Byte) { | |
149 | builder.append(value).append('b'); | |
150 | } else if (value instanceof Character) { | |
151 | encodeString(builder, (String) value); | |
152 | builder.append('c'); | |
153 | } else if (value instanceof Short) { | |
154 | builder.append(value).append('s'); | |
155 | } else if (value instanceof Integer) { | |
156 | builder.append(value); | |
157 | } else if (value instanceof Long) { | |
158 | builder.append(value).append('L'); | |
159 | } else if (value instanceof Float) { | |
160 | builder.append(value).append('F'); | |
161 | } else if (value instanceof Double) { | |
162 | builder.append(value).append('d'); | |
163 | } else { | |
164 | return false; | |
165 | } | |
166 | ||
167 | return true; | |
168 | } | |
169 | ||
170 | static Object decode(String encodedValue) { | |
171 | String cut = ""; | |
172 | if (encodedValue.length() > 1) { | |
173 | cut = encodedValue.substring(0, encodedValue.length() - 1); | |
174 | } | |
175 | ||
176 | if (CustomSerializer.isCustom(encodedValue)) { | |
177 | // custom:TYPE_NAME:"content is String-encoded" | |
178 | String type = CustomSerializer.typeOf(encodedValue); | |
179 | if (customTypes.containsKey(type)) { | |
180 | return customTypes.get(type).decode(encodedValue); | |
181 | } else { | |
182 | throw new java.util.UnknownFormatConversionException( | |
183 | "Unknown custom type: " + type); | |
184 | } | |
185 | } else if (encodedValue.equals("NULL") || encodedValue.equals("null")) { | |
186 | return null; | |
187 | } else if (encodedValue.endsWith("\"")) { | |
188 | return decodeString(encodedValue); | |
189 | } else if (encodedValue.equals("true")) { | |
190 | return true; | |
191 | } else if (encodedValue.equals("false")) { | |
192 | return false; | |
193 | } else if (encodedValue.endsWith("b")) { | |
194 | return Byte.parseByte(cut); | |
195 | } else if (encodedValue.endsWith("c")) { | |
196 | return decodeString(cut).charAt(0); | |
197 | } else if (encodedValue.endsWith("s")) { | |
198 | return Short.parseShort(cut); | |
199 | } else if (encodedValue.endsWith("L")) { | |
200 | return Long.parseLong(cut); | |
201 | } else if (encodedValue.endsWith("F")) { | |
202 | return Float.parseFloat(cut); | |
203 | } else if (encodedValue.endsWith("d")) { | |
204 | return Double.parseDouble(cut); | |
205 | } else { | |
206 | return Integer.parseInt(encodedValue); | |
207 | } | |
208 | } | |
aad14586 NR |
209 | |
210 | static private Class<?> getClass(String type) throws ClassNotFoundException, | |
211 | NoSuchMethodException { | |
212 | Class<?> clazz = null; | |
213 | try { | |
214 | clazz = Class.forName(type); | |
215 | } catch (ClassNotFoundException e) { | |
216 | int pos = type.length(); | |
217 | pos = type.lastIndexOf(".", pos); | |
218 | if (pos >= 0) { | |
219 | String parentType = type.substring(0, pos); | |
220 | String nestedType = type.substring(pos + 1); | |
221 | Class<?> javaParent = null; | |
222 | try { | |
223 | javaParent = getClass(parentType); | |
224 | parentType = javaParent.getName(); | |
225 | clazz = Class.forName(parentType + "$" + nestedType); | |
226 | } catch (Exception ee) { | |
227 | } | |
db31c358 | 228 | |
aad14586 NR |
229 | if (javaParent == null) { |
230 | throw new NoSuchMethodException( | |
231 | "Class not found: " | |
232 | + type | |
233 | + " (the enclosing class cannot be created: maybe it doesn't have an empty constructor?)"); | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
238 | return clazz; | |
239 | } | |
240 | ||
db31c358 NR |
241 | // aa bb -> "aa\tbb" |
242 | private static void encodeString(StringBuilder builder, String raw) { | |
243 | builder.append('\"'); | |
244 | for (char car : raw.toCharArray()) { | |
245 | switch (car) { | |
246 | case '\\': | |
247 | builder.append("\\\\"); | |
248 | break; | |
249 | case '\r': | |
250 | builder.append("\\r"); | |
251 | break; | |
252 | case '\n': | |
253 | builder.append("\\n"); | |
254 | break; | |
255 | case '"': | |
256 | builder.append("\\\""); | |
257 | break; | |
258 | default: | |
259 | builder.append(car); | |
260 | break; | |
261 | } | |
262 | } | |
263 | builder.append('\"'); | |
264 | } | |
265 | ||
266 | // "aa\tbb" -> aa bb | |
267 | private static String decodeString(String escaped) { | |
268 | StringBuilder builder = new StringBuilder(); | |
269 | ||
270 | boolean escaping = false; | |
271 | for (char car : escaped.toCharArray()) { | |
272 | if (!escaping) { | |
273 | if (car == '\\') { | |
274 | escaping = true; | |
275 | } else { | |
276 | builder.append(car); | |
277 | } | |
278 | } else { | |
279 | switch (car) { | |
280 | case '\\': | |
281 | builder.append('\\'); | |
282 | break; | |
283 | case 'r': | |
284 | builder.append('\r'); | |
285 | break; | |
286 | case 'n': | |
287 | builder.append('\n'); | |
288 | break; | |
289 | case '"': | |
290 | builder.append('"'); | |
291 | break; | |
292 | } | |
293 | escaping = false; | |
294 | } | |
295 | } | |
296 | ||
297 | return builder.substring(1, builder.length() - 1).toString(); | |
298 | } | |
299 | } |