• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 179
  • Last Modified:

Beginner: combining two nearly identical classes?

How can I combine these two nearly identical classes?
  class MyMsgAAA
  {
    private int msglen = 0;
    private byte[] MyMsg = new byte[500];

    /*constructor*/
    public MyMsgAAA(byte[] ba)
    {
      //Now build the message
      this.add(0x01);
      ...
      add some bytes special to AAA messages
      ...
      //message itself (.add escapes any special bytes)
      for (int i = 0; i < ba.Length; i++)
      {
        this.add(ba[i]);
      }
    }


    /* THE REST HERE IS IDENTICAL */
    public void add(byte b)
    {
      MyMsg[msglen++] = b;
    }
    //Return message
    public byte[] msg
    {
      get
      {
        byte[] target = new byte[this.msglen];
        Array.Copy(MyMsg, target, msglen);
        return target;
      }
    }
  }

Open in new window

  class MyMsgBBB
  {
    private int msglen = 0;
    private byte[] MyMsg = new byte[500];

    /*constructor*/
    public MyMsgBBB(byte[] ba)
    {
      //Now build the message
      this.add(0x01);
      ...
      add some bytes special to BBB messages
      ...
      //message itself (.add escapes any special bytes)
      for (int i = 0; i < ba.Length; i++)
      {
        this.add(ba[i]);
      }
    }


    /* THE REST HERE IS IDENTICAL */
    public void add(byte b)
    {
      MyMsg[msglen++] = b;
    }
    //Return message
    public byte[] msg
    {
      get
      {
        byte[] target = new byte[this.msglen];
        Array.Copy(MyMsg, target, msglen);
        return target;
      }
    }
  }

Open in new window

In general, I want to call
MyMsgXXX(various parameters)

Open in new window

If the parameter types were always different I could just make different constructors for the same class. But what if some messages have the same type of parameter (such as in example above)?
0
deleyd
Asked:
deleyd
  • 2
  • 2
1 Solution
 
käµfm³d 👽Commented:
I would say make a common base class which encapsulates the common functionality. You can provide specialized constructors in each child if need be.
0
 
deleydAuthor Commented:
Example?
0
 
käµfm³d 👽Commented:
Somehow I knew that's what your next question would be  ; )
class MyMsgBase
{
    protected int msglen = 0;
    protected byte[] MyMsg = new byte[500];

    public MyMsgBase()
    {
        //Now build the message
        this.add(0x01);
    }

    /* THE REST HERE IS IDENTICAL */
    public void add(byte b)
    {
        MyMsg[msglen++] = b;
    }

    //Return message
    public byte[] msg
    {
        get
        {
            byte[] target = new byte[this.msglen];
            Array.Copy(MyMsg, target, msglen);
            return target;
        }
    }
}

class MyMsgAAA : MyMsgBase
{
    /*constructor*/
    public MyMsgAAA(byte[] ba) : base()
    {
        //...
        //add some bytes special to AAA messages
        //...

        //message itself (.add escapes any special bytes)
        for (int i = 0; i < ba.Length; i++)
        {
            base.add(ba[i]);
        }
    }
}

class MyMsgBBB : MyMsgBase
{
    /*constructor*/
    public MyMsgBBB(byte[] ba) : base()
    {
        //...
        //add some bytes special to BBB messages
        //...

        //message itself (.add escapes any special bytes)
        for (int i = 0; i < ba.Length; i++)
        {
            this.add(ba[i]);
        }
    }
}

Open in new window

0
 
deleydAuthor Commented:
:)
0

Featured Post

How to Use the Help Bell

Need to boost the visibility of your question for solutions? Use the Experts Exchange Help Bell to confirm priority levels and contact subject-matter experts for question attention.  Check out this how-to article for more information.

  • 2
  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now