/*
Copyright 2007 Infordata S.p.A.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

/*
!!V 15/07/97 rel. 1.02c- XIDataOrd includes 0x1F char.
    ***
    30/06/98 rel. _.___- Swing, JBuilder2 e VSS.
 */
 
 
package net.infordata.em.tn5250;


import java.io.IOException;
import java.io.InputStream;

import net.infordata.em.crt5250.XIEbcdicTranslator;
import net.infordata.em.tnprot.XITelnet;



///////////////////////////////////////////////////////////////////////////////

/**
 * 5250 Data Order
 *
 * @version  
 * @author   Valentino Proietti - Infordata S.p.A.
 */
public class XIDataOrd extends XI5250Ord {

  protected String ivData;
  protected byte   ivColor;

  /**
   * see http://publibfp.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/co2e2001/15.6.2?SHELF=&DT=19950629163252&CASE=
   * and IBM SA21-9247-6 pg. 2.13
   */
  public static final boolean isDataCharacter(int bb) {
    // 0x1F instead of 0x20 and keep 0xFF chars
//    return (bb == 0x00 || bb == 0x1C || bb == 0x1E || bb == 0x0E || bb == 0x0F ||
//        (bb >= 0x1F && bb <= 0xFF));
    switch (bb) {
      case XI5250Emulator.ORD_IC:
      case XI5250Emulator.ORD_RA:
      case XI5250Emulator.ORD_SBA:
      case XI5250Emulator.ORD_SF:
      case XI5250Emulator.ORD_SOH:
      case XI5250Emulator.ORD_MC:
      case XI5250Emulator.ORD_EA:
      case XI5250Emulator.ORD_TD:
      case XI5250Emulator.ORD_WEA:
      case XI5250Emulator.ORD_WDSF:
      case XI5250Emulator.ESC:
        return false;
      default:
        return true;
    }
  }

  @Override
  protected void readFrom5250Stream(InputStream inStream) throws IOException {
    XIEbcdicTranslator translator = ivEmulator.getTranslator();
    int bb;

    ivColor = 0;
    StringBuilder sb = new StringBuilder(128);

    for (int i = 0;  ; i++) {
      inStream.mark(1);
      bb = inStream.read();

      if (bb == -1)
        break;

      // see IBM SA21-9247-6 pg. 2.13
      if (isDataCharacter(bb)) {
        // is it a color ?
        if (bb > 0x1F && bb <= 0x3F) {
          if (i == 0)
            ivColor = (byte)bb;
          else {
            // cut string if different color
            inStream.reset();
            break;
          }
        }
        else
          sb.append(translator.toChar((byte)bb));
      }
      else {
        inStream.reset();
        break;
      }
    }
    ivData = sb.toString();
  }


  @Override
  protected void execute() {
    if (ivColor != 0) {
      ivEmulator.setDefAttr(XITelnet.toInt(ivColor));
      ivEmulator.drawString(String.valueOf(XI5250Emulator.ATTRIBUTE_PLACE_HOLDER),
                            ivEmulator.getSBACol(), ivEmulator.getSBARow());
      ivEmulator.setSBA(ivEmulator.getSBA() + 1);
    }
    ivEmulator.drawString(ivData, ivEmulator.getSBACol(), ivEmulator.getSBARow());
    ivEmulator.setSBA(ivEmulator.getSBA() + ivData.length());
  }


  @Override
  public String toString() {
    return super.toString() + " [" + XITelnet.toHex(ivColor) + "," + ",\"" + ivData + "\"" + "]";
  }
}