+++ /dev/null
-package be.nikiroo.utils.serial;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.OutputStream;
-
-import be.nikiroo.utils.streams.BufferedInputStream;
-import be.nikiroo.utils.streams.ReplaceInputStream;
-import be.nikiroo.utils.streams.ReplaceOutputStream;
-
-/**
- * A {@link CustomSerializer} supports and generates values in the form:
- * <ul>
- * <li><tt>custom^<i>TYPE</i>^<i>ENCODED_VALUE</i></tt></li>
- * </ul>
- * <p>
- * In this scheme, the values are:
- * <ul>
- * <li><tt>custom</tt>: a fixed keyword</li>
- * <li><tt>^</tt>: a fixed separator character (the
- * <tt><i>ENCODED_VALUE</i></tt> can still use it inside its content, though</li>
- * <li><tt><i>TYPE</i></tt>: the object type of this value</li>
- * <li><tt><i>ENCODED_VALUE</i></tt>: the custom encoded value</li>
- * </ul>
- * <p>
- * To create a new {@link CustomSerializer}, you are expected to implement the
- * abstract methods of this class. The rest should be taken care of bythe
- * system.
- *
- * @author niki
- */
-public abstract class CustomSerializer {
- /**
- * Generate the custom <tt><i>ENCODED_VALUE</i></tt> from this
- * <tt>value</tt>.
- * <p>
- * The <tt>value</tt> will always be of the supported type.
- *
- * @param out
- * the {@link OutputStream} to write the value to
- * @param value
- * the value to serialize
- *
- * @throws IOException
- * in case of I/O error
- */
- protected abstract void toStream(OutputStream out, Object value)
- throws IOException;
-
- /**
- * Regenerate the value from the custom <tt><i>ENCODED_VALUE</i></tt>.
- * <p>
- * The value in the {@link InputStream} <tt>in</tt> will always be of the
- * supported type.
- *
- * @param in
- * the {@link InputStream} containing the
- * <tt><i>ENCODED_VALUE</i></tt>
- *
- * @return the regenerated object
- *
- * @throws IOException
- * in case of I/O error
- */
- protected abstract Object fromStream(InputStream in) throws IOException;
-
- /**
- * Return the supported type name.
- * <p>
- * It <b>must</b> be the name returned by {@link Object#getClass()
- * #getCanonicalName()}.
- *
- * @return the supported class name
- */
- protected abstract String getType();
-
- /**
- * Encode the object into the given {@link OutputStream}, i.e., generate the
- * <tt><i>ENCODED_VALUE</i></tt> part.
- * <p>
- * Use whatever scheme you wish, the system shall ensure that the content is
- * correctly encoded and that you will receive the same content at decode
- * time.
- *
- * @param out
- * the builder to append to
- * @param value
- * the object to encode
- *
- * @throws IOException
- * in case of I/O error
- */
- public void encode(OutputStream out, Object value) throws IOException {
- ReplaceOutputStream replace = new ReplaceOutputStream(out, //
- new String[] { "\\", "\n" }, //
- new String[] { "\\\\", "\\n" });
-
- try {
- SerialUtils.write(replace, "custom^");
- SerialUtils.write(replace, getType());
- SerialUtils.write(replace, "^");
- toStream(replace, value);
- } finally {
- replace.close(false);
- }
- }
-
- /**
- * Decode the value back into the supported object type.
- * <p>
- * We do <b>not</b> expect the full content here but only:
- * <ul>
- * <li>ENCODED_VALUE
- * <li>
- * </ul>
- * That is, we do not expect the "<tt>custom</tt>^<tt><i>TYPE</i></tt>^"
- * part.
- *
- * @param in
- * the encoded value
- *
- * @return the object
- *
- * @throws IOException
- * in case of I/O error
- */
- public Object decode(InputStream in) throws IOException {
- ReplaceInputStream replace = new ReplaceInputStream(in, //
- new String[] { "\\\\", "\\n" }, //
- new String[] { "\\", "\n" });
-
- try {
- return fromStream(replace);
- } finally {
- replace.close(false);
- }
- }
-
- public static boolean isCustom(BufferedInputStream in) throws IOException {
- return in.startsWith("custom^");
- }
-
- public static String typeOf(String encodedValue) {
- int pos1 = encodedValue.indexOf('^');
- int pos2 = encodedValue.indexOf('^', pos1 + 1);
- String type = encodedValue.substring(pos1 + 1, pos2);
-
- return type;
- }
-}