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1 | package be.nikiroo.utils.serial; |
2 | ||
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3 | import java.io.IOException; |
4 | import java.lang.reflect.Field; | |
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5 | import java.util.HashMap; |
6 | import java.util.Map; | |
7 | import java.util.Scanner; | |
8 | ||
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9 | import be.nikiroo.utils.StringUtils; |
10 | ||
11 | /** | |
12 | * A simple class that can accept the output of {@link Exporter} to recreate | |
13 | * objects as they were sent to said exporter. | |
14 | * <p> | |
15 | * This class requires the objects (and their potential enclosing objects) to | |
16 | * have an empty constructor, and does not support inner classes (it does | |
17 | * support nested classes, though). | |
18 | * | |
19 | * @author niki | |
20 | */ | |
21 | public class Importer { | |
22 | private Boolean link; | |
23 | private Object me; | |
24 | private Importer child; | |
25 | private Map<String, Object> map; | |
26 | ||
27 | private String currentFieldName; | |
28 | ||
29 | public Importer() { | |
30 | map = new HashMap<String, Object>(); | |
31 | map.put("NULL", null); | |
32 | } | |
33 | ||
34 | private Importer(Map<String, Object> map) { | |
35 | this.map = map; | |
36 | } | |
37 | ||
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38 | /** |
39 | * Read some data into this {@link Importer}: it can be the full serialised | |
40 | * content, or a number of lines of it (any given line <b>MUST</b> be | |
41 | * complete though) and accumulate it with the already present data. | |
42 | * | |
43 | * @param data | |
44 | * the data to parse | |
45 | * | |
46 | * @return itself so it can be chained | |
47 | * | |
48 | * @throws NoSuchFieldException | |
49 | * if the serialised data contains information about a field | |
50 | * which does actually not exist in the class we know of | |
51 | * @throws NoSuchMethodException | |
52 | * if a class described in the serialised data cannot be created | |
53 | * because it is not compatible with this code | |
54 | * @throws ClassNotFoundException | |
55 | * if a class described in the serialised data cannot be found | |
56 | */ | |
57 | public Importer read(String data) throws NoSuchFieldException, | |
58 | NoSuchMethodException, ClassNotFoundException { | |
db31c358 | 59 | |
db31c358 | 60 | try { |
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61 | Scanner scan = new Scanner(data); |
62 | scan.useDelimiter("\n"); | |
63 | while (scan.hasNext()) { | |
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64 | String line = scan.next(); |
65 | ||
66 | if (line.startsWith("ZIP:")) { | |
67 | line = StringUtils.unzip64(line.substring("ZIP:".length())); | |
68 | } | |
69 | processLine(line); | |
70 | ||
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71 | } |
72 | scan.close(); | |
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73 | } catch (IOException e) { |
74 | throw new NoSuchMethodException( | |
75 | "Internal error when decoding ZIP content: input may be corrupt"); | |
db31c358 | 76 | } |
8c8da42a | 77 | |
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78 | return this; |
79 | } | |
80 | ||
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81 | /** |
82 | * Read a single (whole) line of serialised data into this {@link Importer} | |
83 | * and accumulate it with the already present data. | |
84 | * | |
85 | * @param line | |
86 | * the line to parse | |
87 | * | |
88 | * @return TRUE if we are just done with one object or sub-object | |
89 | * | |
90 | * @throws NoSuchFieldException | |
91 | * if the serialised data contains information about a field | |
92 | * which does actually not exist in the class we know of | |
93 | * @throws NoSuchMethodException | |
94 | * if a class described in the serialised data cannot be created | |
95 | * because it is not compatible with this code | |
96 | * @throws ClassNotFoundException | |
97 | * if a class described in the serialised data cannot be found | |
98 | */ | |
99 | private boolean processLine(String line) throws NoSuchFieldException, | |
100 | NoSuchMethodException, ClassNotFoundException { | |
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101 | // Defer to latest child if any |
102 | if (child != null) { | |
103 | if (child.processLine(line)) { | |
104 | if (currentFieldName != null) { | |
105 | setField(currentFieldName, child.getValue()); | |
106 | currentFieldName = null; | |
107 | } | |
108 | child = null; | |
109 | } | |
110 | ||
111 | return false; | |
112 | } | |
113 | ||
114 | if (line.equals("{")) { // START: new child if needed | |
115 | if (link != null) { | |
116 | child = new Importer(map); | |
117 | } | |
118 | } else if (line.equals("}")) { // STOP: report self to parent | |
119 | return true; | |
120 | } else if (line.startsWith("REF ")) { // REF: create/link self | |
121 | String ref = line.substring(4).split("@")[1]; | |
122 | link = map.containsKey(ref); | |
123 | if (link) { | |
124 | me = map.get(ref); | |
125 | } else { | |
aad14586 | 126 | me = SerialUtils.createObject(line.substring(4).split("@")[0]); |
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127 | map.put(ref, me); |
128 | } | |
129 | } else { // FIELD: new field | |
130 | if (line.endsWith(":")) { | |
131 | // field value is compound | |
132 | currentFieldName = line.substring(0, line.length() - 1); | |
133 | } else { | |
134 | // field value is direct | |
135 | int pos = line.indexOf(":"); | |
136 | String fieldName = line.substring(0, pos); | |
137 | String encodedValue = line.substring(pos + 1); | |
138 | Object value = null; | |
139 | value = SerialUtils.decode(encodedValue); | |
140 | ||
141 | // To support simple types directly: | |
142 | if (me == null) { | |
143 | me = value; | |
144 | } else { | |
145 | setField(fieldName, value); | |
146 | } | |
147 | } | |
148 | } | |
149 | ||
150 | return false; | |
151 | } | |
152 | ||
db31c358 | 153 | private void setField(String name, Object value) |
8c8da42a | 154 | throws NoSuchFieldException { |
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155 | |
156 | try { | |
157 | Field field = me.getClass().getDeclaredField(name); | |
158 | ||
159 | field.setAccessible(true); | |
160 | field.set(me, value); | |
161 | } catch (NoSuchFieldException e) { | |
162 | throw new NoSuchFieldException(String.format( | |
163 | "Field \"%s\" was not found in object of type \"%s\".", | |
164 | name, me.getClass().getCanonicalName())); | |
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165 | } catch (Exception e) { |
166 | throw new NoSuchFieldException(String.format( | |
167 | "Internal error when setting \"%s.%s\": %s", me.getClass() | |
168 | .getCanonicalName(), name, e.getMessage())); | |
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169 | } |
170 | } | |
171 | ||
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172 | /** |
173 | * Return the current deserialised value. | |
174 | * | |
175 | * @return the current value | |
176 | */ | |
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177 | public Object getValue() { |
178 | return me; | |
179 | } | |
180 | } |