src/be/nikiroo/utils/serial/CustomSerializer.java

   1 package be.nikiroo.utils.serial;
   2
   3 import java.io.IOException;
   4
   5 public abstract class CustomSerializer {
   6
   7         protected abstract String toString(Object value);
   8
   9         protected abstract Object fromString(String content) throws IOException;
  10
  11         protected abstract String getType();
  12
  13         /**
  14          * Encode the object into the given builder if possible (if supported).
  15          *
  16          * @param builder
  17          *            the builder to append to
  18          * @param value
  19          *            the object to encode
  20          * @return TRUE if success, FALSE if not (the content of the builder won't
  21          *         be changed in case of failure)
  22          */
  23         public boolean encode(StringBuilder builder, Object value) {
  24                 int prev = builder.length();
  25                 String customString = toString(value);
  26                 builder.append("custom^").append(getType()).append("^");
  27                 if (!SerialUtils.encode(builder, customString)) {
  28                         builder.delete(prev, builder.length());
  29                         return false;
  30                 }
  31
  32                 return true;
  33         }
  34
  35         public Object decode(String encodedValue) throws IOException {
  36                 return fromString((String) SerialUtils.decode(contentOf(encodedValue)));
  37         }
  38
  39         public static boolean isCustom(String encodedValue) {
  40                 int pos1 = encodedValue.indexOf('^');
  41                 int pos2 = encodedValue.indexOf('^', pos1 + 1);
  42
  43                 return pos1 >= 0 && pos2 >= 0 && encodedValue.startsWith("custom^");
  44         }
  45
  46         public static String typeOf(String encodedValue) {
  47                 int pos1 = encodedValue.indexOf('^');
  48                 int pos2 = encodedValue.indexOf('^', pos1 + 1);
  49                 String type = encodedValue.substring(pos1 + 1, pos2);
  50
  51                 return type;
  52         }
  53
  54         public static String contentOf(String encodedValue) {
  55                 int pos1 = encodedValue.indexOf('^');
  56                 int pos2 = encodedValue.indexOf('^', pos1 + 1);
  57                 String encodedContent = encodedValue.substring(pos2 + 1);
  58
  59                 return encodedContent;
  60         }
  61 }