Howto validate image upload in PlayFramework 1?

After searching a little in PlayFramework's source code, I've stumbled upon ImageIO ibrary already used in Play. Cannot understand, why such easy checks have not been added to the core library...

Here's the check part, I've created for :

• dimension check,
• type check,

• size check.

  package validators;
  
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  
  import javax.imageio.ImageIO;
  
  import play.Logger;
  import play.data.validation.Check;
  import play.db.jpa.Blob;
  import play.i18n.Messages;
  
  public class ImageValidator extends Check {
  
    public final static int MAX_SIZE = 4048;
    public final static int MAX_HEIGHT = 1920;
  
    @Override
    public boolean isSatisfied(Object parent, Object image) {
  
      if (!(image instanceof Blob)) {
          return false;
      }
  
      if (!((Blob) image).type().equals("image/jpeg") && !((Blob) image).type().equals("image/png")) {
          return false;
      }
  
      // size check
      if (((Blob) image).getFile().getLength() > MAX_SIZE) {
          return false;
      }
  
  
      try {
          BufferedImage source = ImageIO.read(((Blob) image).getFile());
          int width = source.getWidth();
          int height = source.getHeight();
  
          if (width > MAX_WIDTH || height > MAX_HEIGHT) {
              return false;
          }
      } catch (IOException exption) {
          return false;
      }
  
  
      return true;
      }
  }