| 1 | package be.nikiroo.utils.serial; |
| 2 | |
| 3 | import java.lang.reflect.Constructor; |
| 4 | import java.lang.reflect.Field; |
| 5 | import java.lang.reflect.InvocationTargetException; |
| 6 | import java.util.HashMap; |
| 7 | import java.util.Map; |
| 8 | import java.util.Scanner; |
| 9 | |
| 10 | import be.nikiroo.utils.IOUtils; |
| 11 | import be.nikiroo.utils.StringUtils; |
| 12 | |
| 13 | /** |
| 14 | * A simple class that can accept the output of {@link Exporter} to recreate |
| 15 | * objects as they were sent to said exporter. |
| 16 | * <p> |
| 17 | * This class requires the objects (and their potential enclosing objects) to |
| 18 | * have an empty constructor, and does not support inner classes (it does |
| 19 | * support nested classes, though). |
| 20 | * |
| 21 | * @author niki |
| 22 | */ |
| 23 | public class Importer { |
| 24 | private Boolean link; |
| 25 | private Object me; |
| 26 | private Importer child; |
| 27 | private Map<String, Object> map; |
| 28 | |
| 29 | private String currentFieldName; |
| 30 | |
| 31 | public Importer() { |
| 32 | map = new HashMap<String, Object>(); |
| 33 | map.put("NULL", null); |
| 34 | } |
| 35 | |
| 36 | private Importer(Map<String, Object> map) { |
| 37 | this.map = map; |
| 38 | } |
| 39 | |
| 40 | public Importer readLine(String line) { |
| 41 | try { |
| 42 | processLine(line); |
| 43 | } catch (Exception e) { |
| 44 | throw new IllegalArgumentException(e); |
| 45 | } |
| 46 | return this; |
| 47 | } |
| 48 | |
| 49 | public Importer read(String data) { |
| 50 | try { |
| 51 | if (data.startsWith("ZIP:")) { |
| 52 | data = StringUtils.unzip64(data.substring("ZIP:".length())); |
| 53 | } |
| 54 | Scanner scan = new Scanner(data); |
| 55 | scan.useDelimiter("\n"); |
| 56 | while (scan.hasNext()) { |
| 57 | processLine(scan.next()); |
| 58 | } |
| 59 | scan.close(); |
| 60 | } catch (Exception e) { |
| 61 | throw new IllegalArgumentException(e); |
| 62 | } |
| 63 | return this; |
| 64 | } |
| 65 | |
| 66 | public boolean processLine(String line) throws IllegalArgumentException, |
| 67 | NoSuchFieldException, SecurityException, IllegalAccessException, |
| 68 | NoSuchMethodException, InstantiationException, ClassNotFoundException, InvocationTargetException { |
| 69 | // Defer to latest child if any |
| 70 | if (child != null) { |
| 71 | if (child.processLine(line)) { |
| 72 | if (currentFieldName != null) { |
| 73 | setField(currentFieldName, child.getValue()); |
| 74 | currentFieldName = null; |
| 75 | } |
| 76 | child = null; |
| 77 | } |
| 78 | |
| 79 | return false; |
| 80 | } |
| 81 | |
| 82 | if (line.equals("{")) { // START: new child if needed |
| 83 | if (link != null) { |
| 84 | child = new Importer(map); |
| 85 | } |
| 86 | } else if (line.equals("}")) { // STOP: report self to parent |
| 87 | return true; |
| 88 | } else if (line.startsWith("REF ")) { // REF: create/link self |
| 89 | String ref = line.substring(4).split("@")[1]; |
| 90 | link = map.containsKey(ref); |
| 91 | if (link) { |
| 92 | me = map.get(ref); |
| 93 | } else { |
| 94 | me = createSelf(line.substring(4).split("@")[0]); |
| 95 | map.put(ref, me); |
| 96 | } |
| 97 | } else { // FIELD: new field |
| 98 | if (line.endsWith(":")) { |
| 99 | // field value is compound |
| 100 | currentFieldName = line.substring(0, line.length() - 1); |
| 101 | } else { |
| 102 | // field value is direct |
| 103 | int pos = line.indexOf(":"); |
| 104 | String fieldName = line.substring(0, pos); |
| 105 | String encodedValue = line.substring(pos + 1); |
| 106 | Object value = null; |
| 107 | value = SerialUtils.decode(encodedValue); |
| 108 | |
| 109 | // To support simple types directly: |
| 110 | if (me == null) { |
| 111 | me = value; |
| 112 | } else { |
| 113 | setField(fieldName, value); |
| 114 | } |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | return false; |
| 119 | } |
| 120 | |
| 121 | /** |
| 122 | * Create an empty object of the given type. |
| 123 | * |
| 124 | * @param type |
| 125 | * the object type |
| 126 | * @return the object |
| 127 | * |
| 128 | * @throws NoSuchMethodException |
| 129 | * @throws SecurityException |
| 130 | * @throws InstantiationException |
| 131 | * @throws IllegalAccessException |
| 132 | * @throws ClassNotFoundException |
| 133 | * @throws IllegalArgumentException |
| 134 | * @throws InvocationTargetException |
| 135 | */ |
| 136 | private Object createSelf(String type) throws NoSuchMethodException, |
| 137 | SecurityException, InstantiationException, IllegalAccessException, |
| 138 | ClassNotFoundException, IllegalArgumentException, |
| 139 | InvocationTargetException { |
| 140 | |
| 141 | try { |
| 142 | Class<?> clazz = getClass(type); |
| 143 | if (clazz == null) { |
| 144 | throw new ClassNotFoundException("Class not found: " + type); |
| 145 | } |
| 146 | |
| 147 | String className = clazz.getName(); |
| 148 | Object[] args = null; |
| 149 | Constructor<?> ctor = null; |
| 150 | if (className.contains("$")) { |
| 151 | Object javaParent = createSelf(className.substring(0, |
| 152 | className.lastIndexOf('$'))); |
| 153 | args = new Object[] { javaParent }; |
| 154 | ctor = clazz.getDeclaredConstructor(new Class[] { javaParent |
| 155 | .getClass() }); |
| 156 | } else { |
| 157 | args = new Object[] {}; |
| 158 | ctor = clazz.getDeclaredConstructor(); |
| 159 | } |
| 160 | |
| 161 | ctor.setAccessible(true); |
| 162 | return ctor.newInstance(args); |
| 163 | } catch (NoSuchMethodException e) { |
| 164 | throw new NoSuchMethodException( |
| 165 | String.format( |
| 166 | "Objects of type \"%s\" cannot be created by this code: maybe the class" |
| 167 | + " or its enclosing class doesn't have an empty constructor?", |
| 168 | type)); |
| 169 | |
| 170 | } |
| 171 | } |
| 172 | |
| 173 | private Class<?> getClass(String type) throws ClassNotFoundException, |
| 174 | NoSuchMethodException { |
| 175 | Class<?> clazz = null; |
| 176 | try { |
| 177 | clazz = Class.forName(type); |
| 178 | } catch (ClassNotFoundException e) { |
| 179 | int pos = type.length(); |
| 180 | pos = type.lastIndexOf(".", pos); |
| 181 | if (pos >= 0) { |
| 182 | String parentType = type.substring(0, pos); |
| 183 | String nestedType = type.substring(pos + 1); |
| 184 | Class<?> javaParent = null; |
| 185 | try { |
| 186 | javaParent = getClass(parentType); |
| 187 | parentType = javaParent.getName(); |
| 188 | clazz = Class.forName(parentType + "$" + nestedType); |
| 189 | } catch (Exception ee) { |
| 190 | } |
| 191 | |
| 192 | if (javaParent == null) { |
| 193 | throw new NoSuchMethodException( |
| 194 | "Class not found: " |
| 195 | + type |
| 196 | + " (the enclosing class cannot be created: maybe it doesn't have an empty constructor?)"); |
| 197 | } |
| 198 | } |
| 199 | } |
| 200 | |
| 201 | return clazz; |
| 202 | } |
| 203 | |
| 204 | private void setField(String name, Object value) |
| 205 | throws NoSuchFieldException, SecurityException, |
| 206 | IllegalArgumentException, IllegalAccessException { |
| 207 | |
| 208 | try { |
| 209 | Field field = me.getClass().getDeclaredField(name); |
| 210 | |
| 211 | field.setAccessible(true); |
| 212 | field.set(me, value); |
| 213 | } catch (NoSuchFieldException e) { |
| 214 | throw new NoSuchFieldException(String.format( |
| 215 | "Field \"%s\" was not found in object of type \"%s\".", |
| 216 | name, me.getClass().getCanonicalName())); |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | public Object getValue() { |
| 221 | return me; |
| 222 | } |
| 223 | } |