Updated IPCPpacket and created PCP static class

IPCPpacket
- packets now must implement byte[] header()
PCP
- class contains static util variables, like PORT
- static subclasses contain version specific variables

PCP/src/main/java/PCP/PCP.java

@@ -0,0 +1,36 @@
+/*
+ * this is a school project under "The Unlicence".
+ */
+package PCP;
+
+
+/**
+ * static class utilities and most used values in the PCP protocol.
+ * @author Jacopo_Wolf
+ */
+public final class PCP
+{
+
+    /**
+    * primary port to check for the server
+    */
+    public static final int PORT = 53101;
+
+
+    /**
+     * PCP-Minimal
+     * @author Jacopo_Wolf
+     */
+    public static class Min
+    {
+        /**
+        * maximum lenght of a single package
+        */
+        public static final int MAX_PACKET_LENGHT = 2048;
+    }
+
+
+    // private constructor to avoid initialization 
+    private PCP(){}
+
+}

PCP/src/main/java/PCP/packets/IPCPpacket.java

@@ -13,26 +13,31 @@
  */
 public interface IPCPpacket
 {
-    /**
-     * maximum lenght of a single package
-     */
-    public static final int MAX_PACKET_LENGHT = 2048;
+
 
     /**
      * @return the opcode of this packet
      */
     OpCode getOpCode();
 
     /**
-     * Converts the packet to bytes to be sent.
-     * returs multiple byte arrays if the package exceeds maximum lenght.
-     * @return the collection of byte arrays payload to send.
+     * generates and returns the header of this particular packet. 
+     * header's lenght is never superior to PACKET_MAX_LENGHT
+     * @return the header of this packet
      */
-    Collection<byte[]> toBytes();
+    byte[] header();
 
     /**
-     * @return the total size of this packet
+     * calculates the total size of the packet, headers and payload included.
+     * @return the total size of this packet.
      */
     int size();
+
+    /**
+     * Converts the packet to bytes to be sent.
+     * returs multiple byte arrays if the package exceeds maximum lenght.
+     * @return the collection of byte arrays payload to send.
+     */
+    Collection<byte[]> toBytes();
 
 }

PCP/src/main/java/PCP/packets/PCPGroupUsersList.java

@@ -4,7 +4,7 @@
 package PCP.packets;
 
 import PCP.*;
-import java.nio.charset.StandardCharsets;
+import java.nio.charset.*;
 import java.util.*;
 
 
@@ -82,11 +82,11 @@ public Collection<byte[]> toBytes()
         int NpacketsToSent = 
                 (
                     this.jsonContent.length() /
-                    (IPCPpacket.MAX_PACKET_LENGHT - 4)
+                    (PCP.Min.MAX_PACKET_LENGHT - 4)
                 ) 
                 + 1 ;
 
-        int messageRelativeMaxLenght = IPCPpacket.MAX_PACKET_LENGHT - 4;
+        int messageRelativeMaxLenght = PCP.Min.MAX_PACKET_LENGHT - 4;
 
 
         int messagePointer = 0;

PCP/src/main/java/PCP/packets/PCPMsgUserToGroupPacket.java

@@ -5,7 +5,7 @@
 package PCP.packets;
 
 import PCP.*;
-import java.nio.charset.StandardCharsets;
+import java.nio.charset.*;
 import java.util.*;
 
 /**
@@ -70,11 +70,11 @@ public Collection<byte[]> toBytes()
         int NpacketsToSent = 
                 (
                     this.message.length() / 
-                    (IPCPpacket.MAX_PACKET_LENGHT - 4)
+                    (PCP.MAX_PACKET_LENGHT - 4)
                 ) 
                 + 1 ;
 
-        int messageRelativeMaxLenght = IPCPpacket.MAX_PACKET_LENGHT - 4;
+        int messageRelativeMaxLenght = PCP.MAX_PACKET_LENGHT - 4;
 
 
         int messagePointer = 0;