Added javadoc

svn changeset:11729/svn branch:6.3

1 files changed, 65 insertions, 1 deletions

diff --git a/src/com/vaadin/util/SerializerHelper.java b/src/com/vaadin/util/SerializerHelper.java
index fe9eb28918..2e9bcb422e 100644
--- a/src/com/vaadin/util/SerializerHelper.java
+++ b/src/com/vaadin/util/SerializerHelper.java
@@ -6,11 +6,24 @@ import java.io.ObjectOutputStream;
 
 /**
  * Helper class for performing serialization. Most of the methods are here are
- * workarounds for problems in Google App Engine.
+ * workarounds for problems in Google App Engine. Used internally by Vaadin and
+ * should not be used by application developers. Subject to change at any time.
  * 
+ * @since 6.0
  */
 public class SerializerHelper {
 
+    /**
+     * Serializes the class reference so {@link #readClass(ObjectInputStream)}
+     * can deserialize it. Supports null class references.
+     * 
+     * @param out
+     *            The {@link ObjectOutputStream} to serialize to.
+     * @param cls
+     *            A class or null.
+     * @throws IOException
+     *             Rethrows any IOExceptions from the ObjectOutputStream
+     */
     public static void writeClass(ObjectOutputStream out, Class<?> cls)
             throws IOException {
         if (cls == null) {
@@ -21,6 +34,18 @@ public class SerializerHelper {
 
     }
 
+    /**
+     * Serializes the class references so
+     * {@link #readClassArray(ObjectInputStream)} can deserialize it. Supports
+     * null class arrays.
+     * 
+     * @param out
+     *            The {@link ObjectOutputStream} to serialize to.
+     * @param classes
+     *            An array containing class references or null.
+     * @throws IOException
+     *             Rethrows any IOExceptions from the ObjectOutputStream
+     */
     public static void writeClassArray(ObjectOutputStream out,
             Class<?>[] classes) throws IOException {
         if (classes == null) {
@@ -34,6 +59,19 @@ public class SerializerHelper {
         }
     }
 
+    /**
+     * Deserializes a class references serialized by
+     * {@link #writeClassArray(ObjectOutputStream, Class[])}. Supports null
+     * class arrays.
+     * 
+     * @param in
+     *            {@link ObjectInputStream} to read from.
+     * @return Class array with the class references or null.
+     * @throws ClassNotFoundException
+     *             If one of the classes could not be resolved.
+     * @throws IOException
+     *             Rethrows IOExceptions from the ObjectInputStream
+     */
     public static Class<?>[] readClassArray(ObjectInputStream in)
             throws ClassNotFoundException, IOException {
         String[] classNames = (String[]) in.readObject();
@@ -48,10 +86,23 @@ public class SerializerHelper {
         return classes;
     }
 
+    /**
+     * List of primitive classes. Google App Engine has problems
+     * serializing/deserializing these (#3064).
+     */
     private static Class<?>[] primitiveClasses = new Class<?>[] { byte.class,
             short.class, int.class, long.class, float.class, double.class,
             boolean.class, char.class };
 
+    /**
+     * Resolves the class given by {@code className}.
+     * 
+     * @param className
+     *            The fully qualified class name.
+     * @return A {@code Class} reference.
+     * @throws ClassNotFoundException
+     *             If the class could not be resolved.
+     */
     public static Class<?> resolveClass(String className)
             throws ClassNotFoundException {
         for (Class<?> c : primitiveClasses) {
@@ -63,6 +114,19 @@ public class SerializerHelper {
         return Class.forName(className);
     }
 
+    /**
+     * Deserializes a class reference serialized by
+     * {@link #writeClass(ObjectOutputStream, Class)}. Supports null class
+     * references.
+     * 
+     * @param in
+     *            {@code ObjectInputStream} to read from.
+     * @return Class reference to the resolved class
+     * @throws ClassNotFoundException
+     *             If the class could not be resolved.
+     * @throws IOException
+     *             Rethrows IOExceptions from the ObjectInputStream
+     */
     public static Class<?> readClass(ObjectInputStream in) throws IOException,
             ClassNotFoundException {
         String className = (String) in.readObject();