Simplify the process of getting the component

buffer/src/main/java/io/netty/buffer/CompositeByteBuf.java

@@ -582,15 +582,11 @@ public class CompositeByteBuf extends AbstractByteBuf {
                     + capacity());
         }
         
-        List<ByteBuf> components = decompose(index, 1);
+        int componentId = componentId(index);
-        switch (components.size()) {
+
-        case 0:
+        //Return the component byte buffer
-            return Unpooled.EMPTY_BUFFER;
+        return components[componentId].duplicate();
-        case 1:
+        
-            return components.get(0);
-        default:
-            throw new IOException("Index " + index + " is part of " + components.size() + " buffers!");
-        }
     }
 
     @Override