package be.nikiroo.utils.serial;
import java.io.NotSerializableException;
+import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
/**
- * Small class to help serialise/deserialise objects.
+ * Small class to help with serialisation.
* <p>
* Note that we do not support inner classes (but we do support nested classes)
* and all objects require an empty constructor to be deserialised.
*
* @author niki
*/
-class SerialUtils {
+public class SerialUtils {
private static Map<String, CustomSerializer> customTypes;
static {
customTypes = new HashMap<String, CustomSerializer>();
- // TODO: add "default" custom serialisers
+ // TODO: add "default" custom serialisers if any (Bitmap?)
}
+ /**
+ * Create an empty object of the given type.
+ *
+ * @param type
+ * the object type (its class name)
+ *
+ * @return the new object
+ *
+ * @throws ClassNotFoundException
+ * if the class cannot be found
+ * @throws NoSuchMethodException
+ * if the given class is not compatible with this code
+ */
+ public static Object createObject(String type)
+ throws ClassNotFoundException, NoSuchMethodException {
+
+ try {
+ Class<?> clazz = getClass(type);
+ String className = clazz.getName();
+ Object[] args = null;
+ Constructor<?> ctor = null;
+ if (className.contains("$")) {
+ Object javaParent = createObject(className.substring(0,
+ className.lastIndexOf('$')));
+ args = new Object[] { javaParent };
+ ctor = clazz.getDeclaredConstructor(new Class[] { javaParent
+ .getClass() });
+ } else {
+ args = new Object[] {};
+ ctor = clazz.getDeclaredConstructor();
+ }
+
+ ctor.setAccessible(true);
+ return ctor.newInstance(args);
+ } catch (ClassNotFoundException e) {
+ throw e;
+ } catch (NoSuchMethodException e) {
+ throw e;
+ } catch (Exception e) {
+ throw new NoSuchMethodException("Cannot instantiate: " + type);
+ }
+ }
+
+ /**
+ * Insert a custom serialiser that will take precedence over the default one
+ * or the target class.
+ *
+ * @param serializer
+ * the custom serialiser
+ */
static public void addCustomSerializer(CustomSerializer serializer) {
customTypes.put(serializer.getType(), serializer);
}
+ /**
+ * Serialise the given object into this {@link StringBuilder}.
+ * <p>
+ * <b>Important: </b>If the operation fails (with a
+ * {@link NotSerializableException}), the {@link StringBuilder} will be
+ * corrupted (will contain bad, most probably not importable data).
+ *
+ * @param builder
+ * the output {@link StringBuilder} to serialise to
+ * @param o
+ * the object to serialise
+ * @param map
+ * the map of already serialised objects (if the given object or
+ * one of its descendant is already present in it, only an ID
+ * will be serialised)
+ *
+ * @throws NotSerializableException
+ * if the object cannot be serialised (in this case, the
+ * {@link StringBuilder} can contain bad, most probably not
+ * importable data)
+ */
static void append(StringBuilder builder, Object o, Map<Integer, Object> map)
throws NotSerializableException {
}
}
+ /**
+ * Return the corresponding class or throw an {@link Exception} if it
+ * cannot.
+ *
+ * @param type
+ * the class name to look for
+ *
+ * @return the class (will never be NULL)
+ *
+ * @throws ClassNotFoundException
+ * if the class cannot be found
+ * @throws NoSuchMethodException
+ * if the class cannot be created (usually because it or its
+ * enclosing class doesn't have an empty constructor)
+ */
+ static private Class<?> getClass(String type)
+ throws ClassNotFoundException, NoSuchMethodException {
+ Class<?> clazz = null;
+ try {
+ clazz = Class.forName(type);
+ } catch (ClassNotFoundException e) {
+ int pos = type.length();
+ pos = type.lastIndexOf(".", pos);
+ if (pos >= 0) {
+ String parentType = type.substring(0, pos);
+ String nestedType = type.substring(pos + 1);
+ Class<?> javaParent = null;
+ try {
+ javaParent = getClass(parentType);
+ parentType = javaParent.getName();
+ clazz = Class.forName(parentType + "$" + nestedType);
+ } catch (Exception ee) {
+ }
+
+ if (javaParent == null) {
+ throw new NoSuchMethodException(
+ "Class not found: "
+ + type
+ + " (the enclosing class cannot be created: maybe it doesn't have an empty constructor?)");
+ }
+ }
+ }
+
+ if (clazz == null) {
+ throw new ClassNotFoundException("Class not found: " + type);
+ }
+
+ return clazz;
+ }
+
// aa bb -> "aa\tbb"
private static void encodeString(StringBuilder builder, String raw) {
builder.append('\"');
git://git.nikiroo.be / nikiroo-utils.git / blobdiff