server: String -> Stream

[nikiroo-utils.git] / src / be / nikiroo / utils / serial / CustomSerializer.java

diff --git a/src/be/nikiroo/utils/serial/CustomSerializer.java b/src/be/nikiroo/utils/serial/CustomSerializer.java
index be89316eae07b74f6a67ccaeb589641ba81f8cea..e5539c0fdce8669592a932c819d458b0717c1613 100644 (file)
--- a/src/be/nikiroo/utils/serial/CustomSerializer.java
+++ b/src/be/nikiroo/utils/serial/CustomSerializer.java
@@ -1,39 +1,95 @@
 package be.nikiroo.utils.serial;
 
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+import be.nikiroo.utils.IOUtils;
+import be.nikiroo.utils.streams.NextableInputStream;
+import be.nikiroo.utils.streams.NextableInputStreamStep;
+import be.nikiroo.utils.streams.ReplaceInputStream;
+import be.nikiroo.utils.streams.ReplaceOutputStream;
 
 public abstract class CustomSerializer {
 
-       protected abstract String toString(Object value);
+       protected abstract void toStream(OutputStream out, Object value)
+                       throws IOException;
 
-       protected abstract Object fromString(String content) throws IOException;
+       protected abstract Object fromStream(InputStream in) throws IOException;
 
        protected abstract String getType();
 
        /**
-        * Encode the object into the given builder if possible (if supported).
+        * Encode the object into the given {@link OutputStream} if supported.
         * 
-        * @param builder
+        * @param out
         *            the builder to append to
         * @param value
         *            the object to encode
-        * @return TRUE if success, FALSE if not (the content of the builder won't
-        *         be changed in case of failure)
+        * 
+        * @throws IOException
+        *             in case of I/O error
         */
-       public boolean encode(StringBuilder builder, Object value) {
-               int prev = builder.length();
-               String customString = toString(value);
-               builder.append("custom^").append(getType()).append("^");
-               if (!SerialUtils.encode(builder, customString)) {
-                       builder.delete(prev, builder.length());
-                       return false;
-               }
+       public void encode(OutputStream out, Object value) throws IOException {
+               ReplaceOutputStream replace = new ReplaceOutputStream(out, //
+                               new String[] { "\\", "\n" }, //
+                               new String[] { "\\\\", "\\n" });
 
-               return true;
+               try {
+                       SerialUtils.write(replace, "custom^");
+                       SerialUtils.write(replace, getType());
+                       SerialUtils.write(replace, "^");
+                       toStream(replace, value);
+               } finally {
+                       replace.close(false);
+               }
        }
 
-       public Object decode(String encodedValue) throws IOException {
-               return fromString((String) SerialUtils.decode(contentOf(encodedValue)));
+       public Object decode(InputStream in) throws IOException {
+               ReplaceInputStream replace = new ReplaceInputStream(in, //
+                               new String[] { "\\\\", "\\n" }, //
+                               new String[] { "\\", "\n" });
+
+               try {
+                       NextableInputStream stream = new NextableInputStream(
+                                       replace.open(), new NextableInputStreamStep('^'));
+                       try {
+                               if (!stream.next()) {
+                                       throw new IOException(
+                                                       "Cannot find the first custom^ element");
+                               }
+
+                               String custom = IOUtils.readSmallStream(stream);
+                               if (!"custom".equals(custom)) {
+                                       throw new IOException(
+                                                       "Cannot find the first custom^ element, it is: "
+                                                                       + custom + "^");
+                               }
+
+                               if (!stream.next()) {
+                                       throw new IOException("Cannot find the second custom^"
+                                                       + getType() + " element");
+                               }
+
+                               String type = IOUtils.readSmallStream(stream);
+                               if (!getType().equals(type)) {
+                                       throw new IOException("Cannot find the second custom^"
+                                                       + getType() + " element, it is: custom^" + type
+                                                       + "^");
+                               }
+
+                               if (!stream.nextAll()) {
+                                       throw new IOException("Cannot find the third custom^"
+                                                       + getType() + "^value element");
+                               }
+
+                               return fromStream(stream);
+                       } finally {
+                               stream.close();
+                       }
+               } finally {
+                       replace.close(false);
+               }
        }
 
        public static boolean isCustom(String encodedValue) {