Initial commit

1 files changed, 45 insertions, 0 deletions

diff --git a/src/main/java/com/lumaserv/bgp/protocol/attribute/AS4PathAttribute.java b/src/main/java/com/lumaserv/bgp/protocol/attribute/AS4PathAttribute.java
new file mode 100644
index 0000000..415dd5f
--- /dev/null
+++ b/src/main/java/com/lumaserv/bgp/protocol/attribute/AS4PathAttribute.java
@@ -0,0 +1,45 @@
+package com.lumaserv.bgp.protocol.attribute;
+
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class AS4PathAttribute implements PathAttribute {
+
+    List<Segment> segments = new ArrayList<>();
+
+    public AS4PathAttribute(byte typeCode, byte[] data) {
+        int offset = 0;
+        while (offset < data.length) {
+            Segment segment = new Segment().setType(data[offset]);
+            byte length = data[offset + 1];
+            for(int i=0; i<length; i++)
+                segment.asns.add(
+                        ((data[offset + 2 + (i * 4)] & 0xFF) << 24) |
+                        ((data[offset + 3 + (i * 4)] & 0xFF) << 16) |
+                        ((data[offset + 4 + (i * 4)] & 0xFF) << 8) |
+                        (data[offset + 5 + (i * 4)] & 0xFF)
+                );
+            offset += 2 + (length * 4);
+            segments.add(segment);
+        }
+    }
+
+    public byte getTypeCode() {
+        return 17;
+    }
+
+    public byte[] build() {
+        return new byte[0];
+    }
+
+    @Getter
+    @Setter
+    public static class Segment {
+        byte type;
+        List<Integer> asns = new ArrayList<>();
+    }
+
+}