turn TransportLayer into an interface

1 files changed, 8 insertions, 32 deletions

diff --git a/src/main/kotlin/TransportLayer.kt b/src/main/kotlin/TransportLayer.kt
index 514f78b..d4a9b12 100644
--- a/src/main/kotlin/TransportLayer.kt
+++ b/src/main/kotlin/TransportLayer.kt
@@ -1,43 +1,19 @@
 import java.io.Closeable
 
 /**
- * [TransportLayer] is an abstract class for network transport-layer operations. A class that implements this
- * class' abstract methods, once instantiated, establishes and manages a connection with a remote endpoint defined by an
- * address and a port and allows to send and receive network messages (also called "payloads").
+ * [TransportLayer] is an interface for network transport-layer operations. A class that implements these methods, once
+ * instantiated, establishes and manages a connection with a remote endpoint defined by an address and a port and allows
+ * to send and receive network messages (also called "payloads").
  *
  * The address of the remote endpoint can be an IP address (v4 or v6) or a domain name, in which case it is resolved to
  * an IP address right before initializing the connection. Every constructor should throw an [UnresolvableHostException]
- * if the remote address is a domain name, but it cannot be resolved.
+ * if the remote address is formatted as an actual domain name, but it cannot be resolved (e.g. it doesn't exist, or it
+ * contains forbidden characters).
  *
  * Depending on the specific given implementation, the constructor of this class might throw other exceptions (e.g. the
  * [java.net.Socket] constructor in [TransportLayerJavaNet]).
  */
-abstract class TransportLayer : Closeable {
-    val address: String
-    val port: UShort
-
-    /**
-     * Classic constructor.
-     *
-     * @throws UnresolvableHostException if the remote address is a domain name, but it cannot be resolved.
-     */
-    constructor(address: String, port: UShort) {
-        this.address = address
-        this.port = port
-    }
-
-    /**
-     * This constructor allows addresses specified using one of the styles specified in dial(2). See
-     * [nineAddressToValues].
-     *
-     * @throws UnresolvableHostException if the remote address is a domain name, but it cannot be resolved.
-     */
-    constructor(fullAddress: String) {
-        val ap = nineAddressToValues(fullAddress)
-        this.address = ap.first
-        this.port = ap.second
-    }
-
+interface TransportLayer : Closeable {
     /**
      * Close the connection.
      */
@@ -48,7 +24,7 @@ abstract class TransportLayer : Closeable {
      *
      * @throws java.io.IOException if the message could not be correctly transmitted.
      */
-    abstract fun transmit(payload: Array<UByte>)
+    fun transmit(payload: Array<UByte>)
 /*
     /**
      * Receive a payload until a byte occurs, which marks the end of the message. The byte is discarded after being read
@@ -70,5 +46,5 @@ abstract class TransportLayer : Closeable {
      * @return the received payload.
      * @throws java.io.IOException if the message could not be correctly received.
      */
-    abstract fun receive(length: ULong): Array<UByte>
+    fun receive(length: ULong): Array<UByte>
 }
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