made future serialized class versions backwards compatible.

3 files changed, 35 insertions, 0 deletions

diff --git a/sources/core/VSProcess.java b/sources/core/VSProcess.java
index c6456de..9842321 100644
--- a/sources/core/VSProcess.java
+++ b/sources/core/VSProcess.java
@@ -1024,12 +1024,18 @@ public class VSProcess extends VSPrefs implements VSSerializable {
             System.out.println("Serializing: VSProcess (num: " + processNum
                                + "; id: " + processID + ")");
 
+        /** For later backwards compatibility, to add more stuff */
+        objectOutputStream.writeObject(new Boolean(false));
+
         objectOutputStream.writeObject(new Integer(processID));
         objectOutputStream.writeObject(new Integer(protocolsToReset.size()));
         for (VSAbstractProtocol protocol : protocolsToReset) {
             objectOutputStream.writeObject(protocol.getClassname());
             protocol.serialize(serialize, objectOutputStream);
         }
+
+        /** For later backwards compatibility, to add more stuff */
+        objectOutputStream.writeObject(new Boolean(false));
     }
 
     /* (non-Javadoc)
@@ -1046,6 +1052,9 @@ public class VSProcess extends VSPrefs implements VSSerializable {
         if (VSSerialize.DEBUG)
             System.out.println("Deserializing: VSProcess");
 
+        /** For later backwards compatibility, to add more stuff */
+        objectInputStream.readObject();
+
         this.processID = ((Integer)
                           objectInputStream.readObject()).intValue();
         int numProtocols = ((Integer)
@@ -1057,6 +1066,9 @@ public class VSProcess extends VSPrefs implements VSSerializable {
             protocol.deserialize(serialize, objectInputStream);
         }
 
+        /** For later backwards compatibility, to add more stuff */
+        objectInputStream.readObject();
+
         serialize.setObject(processNum, "process", this);
     }
 }
diff --git a/sources/core/VSTask.java b/sources/core/VSTask.java
index 1b8f744..c1323e8 100644
--- a/sources/core/VSTask.java
+++ b/sources/core/VSTask.java
@@ -362,6 +362,9 @@ public class VSTask implements Comparable, VSSerializable {
     public synchronized void serialize(VSSerialize serialize,
                                        ObjectOutputStream objectOutputStream)
     throws IOException {
+        /** For later backwards compatibility, to add more stuff */
+        objectOutputStream.writeObject(new Boolean(false));
+
         objectOutputStream.writeObject(new Integer(process.getProcessNum()));
         objectOutputStream.writeObject(event.getClassname());
         objectOutputStream.writeObject(new Integer(event.getID()));
@@ -370,6 +373,9 @@ public class VSTask implements Comparable, VSSerializable {
         objectOutputStream.writeObject(new Long(taskTime));
         objectOutputStream.writeObject(new Boolean(isGlobalTimed));
         objectOutputStream.writeObject(new Boolean(isProgrammed));
+
+        /** For later backwards compatibility, to add more stuff */
+        objectOutputStream.writeObject(new Boolean(false));
     }
 
     /* (non-Javadoc)
@@ -383,6 +389,9 @@ public class VSTask implements Comparable, VSSerializable {
         if (VSSerialize.DEBUG)
             System.out.println("Deserializing: VSTask");
 
+        /** For later backwards compatibility, to add more stuff */
+        objectInputStream.readObject();
+
         int processNum = ((Integer) objectInputStream.readObject()).intValue();
         VSProcess process = (VSProcess)
                             serialize.getObject(processNum, "process");
@@ -412,6 +421,9 @@ public class VSTask implements Comparable, VSSerializable {
         serialize.setObject(taskNum, "task", this);
         init(taskTime, process, event, !isGlobalTimed.booleanValue());
         this.isProgrammed = isProgrammed.booleanValue();
+
+        /** For later backwards compatibility, to add more stuff */
+        objectInputStream.readObject();
     }
 }
 
diff --git a/sources/core/VSTaskManager.java b/sources/core/VSTaskManager.java
index 272a52c..d4ee83c 100644
--- a/sources/core/VSTaskManager.java
+++ b/sources/core/VSTaskManager.java
@@ -503,6 +503,8 @@ public class VSTaskManager implements VSSerializable {
     public synchronized void serialize(VSSerialize serialize,
                                        ObjectOutputStream objectOutputStream)
     throws IOException {
+        /** For later backwards compatibility, to add more stuff */
+        objectOutputStream.writeObject(new Boolean(false));
 
         ArrayList<VSTask> tasks = new ArrayList<VSTask>();
 
@@ -526,6 +528,9 @@ public class VSTaskManager implements VSSerializable {
         objectOutputStream.writeObject(new Integer(tasks.size()));
         for (VSTask task : tasks)
             task.serialize(serialize, objectOutputStream);
+
+        /** For later backwards compatibility, to add more stuff */
+        objectOutputStream.writeObject(new Boolean(false));
     }
 
     /* (non-Javadoc)
@@ -539,6 +544,9 @@ public class VSTaskManager implements VSSerializable {
         if (VSSerialize.DEBUG)
             System.out.println("Deserializing: VSTaskManager");
 
+        /** For later backwards compatibility, to add more stuff */
+        objectInputStream.readObject();
+
         globalTasks.clear();
 
         ArrayList<VSProcess> processes = simulatorCanvas.getProcesses();
@@ -552,5 +560,8 @@ public class VSTaskManager implements VSSerializable {
             VSTask task = new VSTask(serialize, objectInputStream);
             addTask(task, task.isProgrammed());
         }
+
+        /** For later backwards compatibility, to add more stuff */
+        objectInputStream.readObject();
     }
 }