com.bytezone.dm3270.orders.ModifyFieldOrder 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: 0.9.1

package com.bytezone.dm3270.orders;

import com.bytezone.dm3270.attributes.Attribute;
import com.bytezone.dm3270.display.DisplayScreen;

import java.util.Optional;

public class ModifyFieldOrder extends Order {

  public ModifyFieldOrder(byte[] buffer, int offset) {
    assert buffer[offset] == Order.MODIFY_FIELD;

    int totalAttributePairs = buffer[offset + 1] & 0xFF;

    this.buffer = new byte[totalAttributePairs * 2 + 2];
    this.buffer[0] = buffer[offset];
    this.buffer[1] = buffer[offset + 1];

    int ptr = offset + 2;
    int bptr = 2;
    for (int i = 0; i < totalAttributePairs; i++) {
      Optional attribute =
          Attribute.getAttribute(buffer[ptr], buffer[ptr + 1]);
      assert attribute.isPresent();
      this.buffer[bptr++] = buffer[ptr++];
      this.buffer[bptr++] = buffer[ptr++];
    }
  }

  @Override
  public void process(DisplayScreen screen) {
  }

}