com.bytezone.dm3270.commands.WriteStructuredFieldCommand 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.commands;

import com.bytezone.dm3270.Charset;
import com.bytezone.dm3270.buffers.Buffer;
import com.bytezone.dm3270.buffers.MultiBuffer;
import com.bytezone.dm3270.display.Screen;
import com.bytezone.dm3270.structuredfields.DefaultStructuredField;
import com.bytezone.dm3270.structuredfields.EraseResetSF;
import com.bytezone.dm3270.structuredfields.Outbound3270DS;
import com.bytezone.dm3270.structuredfields.ReadPartitionSF;
import com.bytezone.dm3270.structuredfields.SetReplyModeSF;
import com.bytezone.dm3270.structuredfields.StructuredField;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class WriteStructuredFieldCommand extends Command {

  private static final Logger LOG = LoggerFactory.getLogger(WriteStructuredFieldCommand.class);

  private static final String LINE =
      "\n-------------------------------------------------------------------------";

  private final List structuredFields =
      new ArrayList<>();
  private final List replies = new ArrayList<>();
  private final Charset charset;

  public WriteStructuredFieldCommand(byte[] buffer, int offset, int length, Charset charset) {
    super(buffer, offset, length);
    this.charset = charset;

    assert buffer[offset] == Command.WRITE_STRUCTURED_FIELD_11
        || buffer[offset] == Command.WRITE_STRUCTURED_FIELD_F3;

    int ptr = offset + 1;
    int max = offset + length;

    while (ptr < max) {
      int size = Buffer.unsignedShort(buffer, ptr) - 2;
      ptr += 2;

      switch (buffer[ptr]) {
        // wrapper for original write commands - W. EW, EWA, EAU
        case StructuredField.OUTBOUND_3270DS:
          structuredFields.add(new Outbound3270DS(buffer, ptr, size, charset));
          break;

        // wrapper for original read commands - RB, RM, RMA
        case StructuredField.READ_PARTITION:
          structuredFields.add(new ReadPartitionSF(buffer, ptr, size, charset));
          break;

        case StructuredField.RESET_PARTITION:
          LOG.warn("SF_RESET_PARTITION (00) not written yet");
          structuredFields.add(new DefaultStructuredField(buffer, ptr, size, charset));
          break;

        case StructuredField.SET_REPLY_MODE:
          structuredFields.add(new SetReplyModeSF(buffer, ptr, size, charset));
          break;

        case StructuredField.ACTIVATE_PARTITION:
          LOG.warn("SF_ACTIVATE_PARTITION (0E) not written yet");
          structuredFields.add(new DefaultStructuredField(buffer, ptr, size, charset));
          break;

        case StructuredField.ERASE_RESET:
          structuredFields.add(new EraseResetSF(buffer, ptr, size, charset));
          break;

        default:
          structuredFields.add(new DefaultStructuredField(buffer, ptr, size, charset));
          break;
      }

      ptr += size;
    }
  }

  @Override
  public void process(Screen screen) {
    replies.clear();

    for (StructuredField structuredField : structuredFields) {
      structuredField.process(screen);
      Optional reply = structuredField.getReply();
      reply.ifPresent(replies::add);
    }
  }

  @Override
  public Optional getReply() {
    if (replies.size() == 0) {
      return Optional.empty();
    }

    if (replies.size() == 1) {
      return Optional.of(replies.get(0));
    }

    MultiBuffer multiBuffer = new MultiBuffer(charset);
    for (Buffer reply : replies) {
      multiBuffer.addBuffer(reply);
    }

    return Optional.of(multiBuffer);
  }

  @Override
  public String getName() {
    return "Write SF";
  }

  @Override
  public String toString() {
    StringBuilder text =
        new StringBuilder(String.format("WSF (%d):", structuredFields.size()));

    for (StructuredField sf : structuredFields) {
      text.append(LINE);
      text.append("\n");
      text.append(sf);
    }

    if (structuredFields.size() > 0) {
      text.append(LINE);
    }

    return text.toString();
  }

}