| 1 | package be.nikiroo.utils.serial; |
| 2 | |
| 3 | import java.io.IOException; |
| 4 | import java.io.InputStream; |
| 5 | import java.io.OutputStream; |
| 6 | |
| 7 | import be.nikiroo.utils.IOUtils; |
| 8 | import be.nikiroo.utils.NextableInputStream; |
| 9 | import be.nikiroo.utils.NextableInputStreamStep; |
| 10 | |
| 11 | public abstract class CustomSerializer { |
| 12 | |
| 13 | protected abstract void toStream(OutputStream out, Object value) |
| 14 | throws IOException; |
| 15 | |
| 16 | protected abstract Object fromStream(InputStream in) throws IOException; |
| 17 | |
| 18 | protected abstract String getType(); |
| 19 | |
| 20 | /** |
| 21 | * Encode the object into the given {@link OutputStream} if supported. |
| 22 | * |
| 23 | * @param out |
| 24 | * the builder to append to |
| 25 | * @param value |
| 26 | * the object to encode |
| 27 | * |
| 28 | * @return FALSE if the value is not supported, TRUE if the operation was |
| 29 | * successful (if the value is supported by the operation was not |
| 30 | * successful, you will get an {@link IOException}) |
| 31 | * |
| 32 | * @throws IOException |
| 33 | * in case of I/O error |
| 34 | */ |
| 35 | public boolean encode(OutputStream out, Object value) throws IOException { |
| 36 | SerialUtils.write(out, "custom^"); |
| 37 | SerialUtils.write(out, getType()); |
| 38 | SerialUtils.write(out, "^"); |
| 39 | // TODO: manage ENTER |
| 40 | toStream(out, value); |
| 41 | |
| 42 | return true; |
| 43 | } |
| 44 | |
| 45 | public Object decode(InputStream in) throws IOException { |
| 46 | // TODO: manage ENTER |
| 47 | // TODO read and skip "custom^......^": next(), next(), nextAll() ? |
| 48 | NextableInputStream stream = new NextableInputStream(in, |
| 49 | new NextableInputStreamStep('^')); |
| 50 | |
| 51 | try { |
| 52 | if (!stream.next()) { |
| 53 | throw new IOException("Cannot find the first custom^ element"); |
| 54 | } |
| 55 | |
| 56 | String custom = IOUtils.readSmallStream(stream); |
| 57 | if (!"custom".equals(custom)) { |
| 58 | throw new IOException( |
| 59 | "Cannot find the first custom^ element, it is: " |
| 60 | + custom + "^"); |
| 61 | } |
| 62 | |
| 63 | if (!stream.next()) { |
| 64 | throw new IOException("Cannot find the second custom^" |
| 65 | + getType() + " element"); |
| 66 | } |
| 67 | |
| 68 | String type = IOUtils.readSmallStream(stream); |
| 69 | if (!getType().equals(type)) { |
| 70 | throw new IOException("Cannot find the second custom^" |
| 71 | + getType() + " element, it is: custom^" + type + "^"); |
| 72 | } |
| 73 | |
| 74 | if (!stream.nextAll()) { |
| 75 | throw new IOException("Cannot find the third custom^" |
| 76 | + getType() + "^value element"); |
| 77 | } |
| 78 | |
| 79 | // TODO: manage ENTER |
| 80 | return fromStream(stream); |
| 81 | } finally { |
| 82 | stream.close(false); |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | public static boolean isCustom(String encodedValue) { |
| 87 | int pos1 = encodedValue.indexOf('^'); |
| 88 | int pos2 = encodedValue.indexOf('^', pos1 + 1); |
| 89 | |
| 90 | return pos1 >= 0 && pos2 >= 0 && encodedValue.startsWith("custom^"); |
| 91 | } |
| 92 | |
| 93 | public static String typeOf(String encodedValue) { |
| 94 | int pos1 = encodedValue.indexOf('^'); |
| 95 | int pos2 = encodedValue.indexOf('^', pos1 + 1); |
| 96 | String type = encodedValue.substring(pos1 + 1, pos2); |
| 97 | |
| 98 | return type; |
| 99 | } |
| 100 | |
| 101 | public static String contentOf(String encodedValue) { |
| 102 | int pos1 = encodedValue.indexOf('^'); |
| 103 | int pos2 = encodedValue.indexOf('^', pos1 + 1); |
| 104 | String encodedContent = encodedValue.substring(pos2 + 1); |
| 105 | |
| 106 | return encodedContent; |
| 107 | } |
| 108 | } |