com.bytezone.dm3270.extended.AbstractExtendedCommand Maven / Gradle / Ivy

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This is a trimmed down version of https://github.com/dmolony/dm3270 to be used as TN3270 client library

There is a newer version: 0.15-lib

package com.bytezone.dm3270.extended;

import com.bytezone.dm3270.buffers.AbstractReplyBuffer;
import com.bytezone.dm3270.display.Screen;

public abstract class AbstractExtendedCommand extends AbstractReplyBuffer {

  protected final CommandHeader commandHeader;

  public AbstractExtendedCommand(CommandHeader commandHeader) {
    this.commandHeader = commandHeader;
  }

  public AbstractExtendedCommand(CommandHeader commandHeader, byte[] buffer, int offset,
      int length) {
    super(buffer, offset, length);
    this.commandHeader = commandHeader;
  }

  @Override
  public byte[] getData() {
    byte[] buffer = new byte[data.length + 5];
    System.arraycopy(commandHeader.getData(), 0, buffer, 0, 5);
    System.arraycopy(data, 0, buffer, 5, data.length);
    return buffer;
  }

  @Override
  public int size() {
    return data.length + 5;
  }

  @Override
  public byte[] getTelnetData() {
    byte[] data = getData();                       // prepend the command header
    int length = data.length + countFF(data) + 2;  // add in expanded 0xFF and IAC/EOR
    byte[] buffer = new byte[length];
    copyAndExpand(data, buffer);
    buffer[--length] = (byte) 0xEF;                 // EOR
    buffer[--length] = (byte) 0xFF;                 // IAC
    return buffer;
  }

  public abstract String getName();

  @Override
  public void process(Screen screen) {
    commandHeader.process(screen);
  }

}