com.bytezone.dm3270.orders.StartFieldExtendedOrder 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.attributes.StartFieldAttribute;
import com.bytezone.dm3270.display.DisplayScreen;
import com.bytezone.dm3270.display.Pen;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

public class StartFieldExtendedOrder extends Order {

  private StartFieldAttribute startFieldAttribute;
  private final List attributes = new ArrayList<>();
  private int location = -1;

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

    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 bptr = 2;
    int ptr = offset + 2;

    while (totalAttributePairs-- > 0) {
      Optional opt = Attribute.getAttribute(buffer[ptr], buffer[ptr + 1]);
      assert opt.isPresent();
      Attribute attribute = opt.get();

      // There has to be a StartFieldAttribute, but it could be anywhere in the list
      if (attribute.getAttributeType() == Attribute.AttributeType.START_FIELD) {
        startFieldAttribute = (StartFieldAttribute) attribute;
      } else {
        attributes.add(attribute);
      }

      this.buffer[bptr++] = buffer[ptr++];
      this.buffer[bptr++] = buffer[ptr++];
    }

    assert startFieldAttribute != null;
    startFieldAttribute.setExtended();
  }

  @Override
  public void process(DisplayScreen screen) {
    Pen pen = screen.getPen();
    location = pen.getPosition();
    pen.startField(startFieldAttribute);

    for (Attribute attribute : attributes) {
      pen.addAttribute(attribute);
    }

    pen.moveRight();
  }

  @Override
  public String toString() {
    StringBuilder text = new StringBuilder();
    String locationText = location >= 0 ? String.format("(%04d)", location) : "";
    text.append(String.format("SFE : %s %s", startFieldAttribute, locationText));

    for (Attribute attr : attributes) {
      text.append(String.format("\n      %-34s", attr));
    }

    return text.toString();
  }

}