display an error when image fails to be analyzed

img-core/src/main/kotlin/dev/nuculabs/imagetagger/core/AnalyzedImage.kt

@@ -15,6 +15,7 @@ class AnalyzedImage(private val file: File, imageTagsPrediction: IImageTagsPredi
     private var predictedTags: List<String> = emptyList()
     private val logger: Logger = Logger.getLogger("AnalyzedImage")
     private var error: String = ""
+    private var hasError: Boolean = false
 
     /**
      * Initializes the analyzed image and predicts its tags.
@@ -23,24 +24,39 @@ class AnalyzedImage(private val file: File, imageTagsPrediction: IImageTagsPredi
         try {
             bufferedImage = ImageIO.read(File(file.absolutePath))
             predictedTags = imageTagsPrediction.predictTags(bufferedImage!!)
+        } catch (e: NullPointerException) {
+            val message = "Error while predicting image: invalid image type or type not supported."
+            logger.warning(message)
+            hasError = true
+            error = message
         } catch (e: Exception) {
-            logger.warning("Error while predicting images $e")
+            val message = "Error loading image $e"
+            logger.warning(message)
+            hasError = true
             error = e.message.toString()
         }
     }
 
+    /**
+     * Returns a boolean indicating if the image analysis has errors.
+     * The flag is `True` if it has errors, `False` otherwise.
+     */
+    fun hasError(): Boolean {
+        return hasError
+    }
+
     /**
      * Returns the prediction error
      */
     fun errorMessage(): String {
-        return error;
+        return error
     }
 
     /**
      * Returns the absolute file path of the image.
      */
     fun absolutePath(): String {
-        return file.absolutePath;
+        return file.absolutePath
     }
 
     /**

img-ui/src/main/kotlin/dev/nuculabs/imagetagger/ui/controls/ImageTagsEntryControl.kt

@@ -60,8 +60,13 @@ class ImageTagsEntryControl(private val image: AnalyzedImage) : HBox() {
         } catch (exception: IOException) {
             throw RuntimeException(exception)
         }
-        setImage(image.absolutePath())
-        setText(image.tags())
+        setImage(image)
+        if (image.hasError()) {
+            setText(listOf(image.errorMessage()))
+        } else {
+            setText(image.tags())
+        }
+
 
         setupEventHandlers()
     }
@@ -95,13 +100,20 @@ class ImageTagsEntryControl(private val image: AnalyzedImage) : HBox() {
     /**
      * Setter for setting the image.
      */
-    private fun setImage(imagePath: String) {
-        val file = File(imagePath)
-        file.inputStream().use {
-            imageView.image = Image(it, 244.0, 244.0, true, true)
+    private fun setImage(analyzedImage: AnalyzedImage) {
+        val file = File(analyzedImage.absolutePath())
+        if (analyzedImage.hasError()) {
+            fileNameLabel.text = "Failed: ${file.name}"
+            fileNameLabel.styleClass.add("errorLabel")
+            imageView.image = Image(this.javaClass.getResourceAsStream("images/failed.png"))
             imageView.isCache = true
+        } else {
+            file.inputStream().use {
+                imageView.image = Image(it, 244.0, 244.0, true, true)
+                imageView.isCache = true
+            }
+            fileNameLabel.text = "File: ${file.name}"
         }
-        fileNameLabel.text = "File: ${file.name}"
     }
 
     /**

img-ui/src/main/resources/dev/nuculabs/imagetagger/ui/controls/image-tags-entry.css

@@ -0,0 +1,5 @@
+
+.errorLabel {
+    -fx-text-background-color: red;
+    -fx-font-family: "Inter Bold"
+}

img-ui/src/main/resources/dev/nuculabs/imagetagger/ui/controls/image-tags-entry.fxml

@@ -6,8 +6,8 @@
 
 <?import javafx.scene.image.ImageView?>
 <?import org.kordamp.ikonli.javafx.FontIcon?>
-<fx:root type="javafx.scene.layout.HBox" xmlns:fx="http://javafx.com/fxml">
-    <StackPane style="-fx-background-color: lightgray;" prefWidth="244" prefHeight="244">
+<fx:root type="javafx.scene.layout.HBox" xmlns:fx="http://javafx.com/fxml" stylesheets="@image-tags-entry.css">
+    <StackPane prefWidth="244" prefHeight="244">
         <ImageView fx:id="imageView"/>
     </StackPane>
     <VBox>