1 files changed, 29 insertions, 0 deletions
diff --git a/sources/shared/remotecall/RemoteCall.java b/sources/shared/remotecall/RemoteCall.java
new file mode 100644
index 0000000..8703f00
--- /dev/null
+++ b/sources/shared/remotecall/RemoteCall.java
@@ -0,0 +1,29 @@
+package shared.remotecall;
+
+import java.io.*;
+
+/**
+ * This is the abstract base class of all other classes of the shared.remotecall package.
+ * Its defining some common methods.
+ * @author buetow
+ *
+ */
+public abstract class RemoteCall {
+  /**
+   * This is a help method for writeObject of the child classes, needed for ojbect serialization (sending part).
+   * It checks if object is defined. If yes, it will be written to the given object output stream with a leading
+   * flag with the value true. Otherwise only the false flag will be written to the object output stream.
+   * @param objectOutputStream Specifies the output stream.
+   * @throws IOException
+   */
+  protected final void writeObjectIfDefined(ObjectOutputStream objectOutputStream, Object object)
+  throws IOException {
+    if (object == null) {
+      objectOutputStream.writeBoolean(false);
+
+    } else {
+      objectOutputStream.writeBoolean(true);
+      objectOutputStream.writeObject(object);
+    }
+  }
+}