Better resource cleanup

.gitignore

@@ -2,6 +2,7 @@
 .vs/
 bin/
 target/
+build/
 .classpath
 .project
 *.fxbuild

src/de/rogovskyy/reorderpdf/Main.fxml

@@ -8,6 +8,8 @@
 <?import java.lang.*?>
 <?import javafx.scene.layout.*?>
 <?import javafx.scene.layout.BorderPane?>
+<?import javafx.scene.layout.StackPane?>
+<?import javafx.scene.control.Label?>
 
 <BorderPane prefHeight="646.0" prefWidth="973.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="de.rogovskyy.reorderpdf.MainController">
    <top>
@@ -54,7 +56,12 @@
         <items>
           <AnchorPane minHeight="0.0" minWidth="0.0" prefHeight="160.0" prefWidth="100.0">
                <children>
-                  <ListView fx:id="pagesView" AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0" />
+               	  <StackPane AnchorPane.bottomAnchor="0.0" AnchorPane.leftAnchor="0.0" AnchorPane.rightAnchor="0.0" AnchorPane.topAnchor="0.0">
+               	  	<children>
+               	  		<ListView fx:id="pagesView" />
+               	  		<Label fx:id="infoTxt" alignment="CENTER" prefHeight="210.0" prefWidth="147.0" text="After adding PDF or image files, you can reorder them freely." textAlignment="CENTER" wrapText="true" />
+               	  	</children>
+               	  </StackPane>
                </children>
                <padding>
                   <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />

src/de/rogovskyy/reorderpdf/Main.java

@@ -2,17 +2,20 @@
 
 import javafx.application.Application;
 import javafx.fxml.FXMLLoader;
+import javafx.scene.Parent;
 import javafx.scene.Scene;
-import javafx.scene.layout.BorderPane;
 import javafx.stage.Stage;
 
 public class Main extends Application {
+	private MainController mainController;
+
 	@Override
 	public void start(Stage primaryStage) {
 		try {
-			BorderPane root = (BorderPane) FXMLLoader.load(getClass().getResource("Main.fxml"));
+			FXMLLoader loader = new FXMLLoader(getClass().getResource("Main.fxml"));
+			Parent root = loader.load();
+			mainController = loader.getController();
 			Scene scene = new Scene(root, 800, 600);
-			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
 			primaryStage.setScene(scene);
 			primaryStage.setTitle("ReorderPDF");
 			primaryStage.show();
@@ -24,4 +27,10 @@ public void start(Stage primaryStage) {
 	public static void main(String[] args) {
 		launch(args);
 	}
+
+	@Override
+	public void stop() throws Exception {
+		if (mainController != null)
+			mainController.close();
+	}
 }

src/de/rogovskyy/reorderpdf/MainController.java

@@ -14,6 +14,7 @@
 import javafx.scene.control.Alert.AlertType;
 import javafx.scene.control.Button;
 import javafx.scene.control.ButtonType;
+import javafx.scene.control.Label;
 import javafx.scene.control.ListView;
 import javafx.scene.layout.Background;
 import javafx.scene.layout.BackgroundImage;
@@ -27,6 +28,9 @@
 public class MainController {
 	private final PagesManager mgr = new PagesManager();
 
+	@FXML
+	public Label infoTxt;
+
 	@FXML
 	public ListView<DocumentPage> pagesView;
 
@@ -62,7 +66,8 @@ public void initialize() {
 		downBtn.disableProperty().bind(dependsOnSelected((i, s) -> i == -1 || i == mgr.getDocumentPages().size() - 1));
 		removeBtn.disableProperty().bind(dependsOnSelected((i, s) -> s == null));
 		saveBtn.disableProperty().bind(Bindings.equal(Bindings.size(mgr.documentPagesProperty()), 0));
-
+		infoTxt.visibleProperty().bind(Bindings.equal(Bindings.size(mgr.documentPagesProperty()), 0));
+
 		addBtn.setOnAction((ae) -> {
 			FileChooser fileChooser = new FileChooser();
 			fileChooser.getExtensionFilters().addAll(new ExtensionFilter("PDF File", "*.pdf"),
@@ -125,7 +130,7 @@ public void initialize() {
 
 		removeBtn.setOnAction((ae) -> {
 			int i = pagesView.getSelectionModel().getSelectedIndex();
-			mgr.getDocumentPages().remove(i);
+			mgr.remove(i);
 			if (mgr.getDocumentPages().size() > 0) {
 				pagesView.getSelectionModel().select(i);
 				pagesView.requestFocus();
@@ -149,4 +154,8 @@ private Background getBackgroundFromSelectedItm() {
 				new BackgroundImage(selected.getImage(), BackgroundRepeat.NO_REPEAT, BackgroundRepeat.NO_REPEAT,
 						BackgroundPosition.CENTER, new BackgroundSize(0, 0, false, false, true, false)));
 	}
+
+	public void close() {
+		mgr.close();
+	}
 }

src/de/rogovskyy/reorderpdf/model/PDFReference.java

@@ -0,0 +1,7 @@
+package de.rogovskyy.reorderpdf.model;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+
+public interface PDFReference {
+	PDDocument getPdf();
+}

src/de/rogovskyy/reorderpdf/model/PagesManager.java

@@ -8,16 +8,18 @@
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
 
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
 import org.apache.pdfbox.pdmodel.PDDocument;
 
 import javafx.beans.property.SimpleListProperty;
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 
 public class PagesManager {
+	private static final Log log = LogFactory.getLog(PagesManager.class);
 	public static final String[] SUPPORTED_IMG_EXTS = { ".jpg", ".jpeg", ".png" };
 
-	// TODO add pdf closing
 	private final SimpleListProperty<DocumentPage> documentPages = new SimpleListProperty<>(
 			FXCollections.observableArrayList());
 
@@ -67,14 +69,14 @@ public void unpackPDF(int itemIndex) {
 		// convert them first and add all at once to update UI only once
 		WholeDocumentPage pdfPage = ((WholeDocumentPage) page);
 		PDDocument pdf = pdfPage.getPdf();
-		List<PDFPage> newPages = IntStream.range(0, pdf.getNumberOfPages()).mapToObj((i) -> new PDFPage(pdfPage.toString(), pdf, i))
-				.collect(Collectors.toList());
+		List<SinglePDFPage> newPages = IntStream.range(0, pdf.getNumberOfPages())
+				.mapToObj((i) -> new SinglePDFPage(pdfPage.toString(), pdf, i)).collect(Collectors.toList());
 		documentPages.remove(itemIndex);
 		documentPages.addAll(itemIndex, newPages);
 	}
 
 	public void save(File selectedFile) throws IOException {
-		if(documentPages.size()==0)
+		if (documentPages.size() == 0)
 			throw new IOException("You need to add at least one page");
 		PDDocument pdf = new PDDocument();
 		for (DocumentPage documentPage : documentPages) {
@@ -83,4 +85,40 @@ public void save(File selectedFile) throws IOException {
 		pdf.save(selectedFile);
 	}
 
+	public void remove(int i) {
+		if (i < 0 || i >= documentPages.size())
+			throw new IndexOutOfBoundsException();
+		PDDocument referencedDoc;
+		DocumentPage page = documentPages.get(i);
+		if (page instanceof PDFReference)
+			referencedDoc = ((PDFReference) page).getPdf();
+		else
+			referencedDoc = null;
+
+		documentPages.remove(i);
+
+		// if the removed page referenced a PDDocument, we need to make sure to close it if no references
+		// to it are left
+		if (referencedDoc != null && !documentPages.stream()
+				.anyMatch((p) -> p instanceof PDFReference && ((PDFReference) p).getPdf() == referencedDoc)) {
+			try {
+				referencedDoc.close();
+			} catch (IOException e) {
+				log.debug("Error while closing PDF document", e);
+			}
+		}
+	}
+
+	public void close() {
+		for (DocumentPage page : documentPages) {
+			if(page instanceof PDFReference) {
+				try {
+					((PDFReference) page).getPdf().close();
+				} catch (IOException e) {
+					log.debug("Error while closing PDF document", e);
+				}
+			}
+		}
+	}
+
 }

src/de/rogovskyy/reorderpdf/model/PDFPage.java → src/de/rogovskyy/reorderpdf/model/SinglePDFPage.java

@@ -11,16 +11,16 @@
 import javafx.embed.swing.SwingFXUtils;
 import javafx.scene.image.Image;
 
-public class PDFPage implements DocumentPage {
-	private static final Log log = LogFactory.getLog(PDFPage.class);
+public class SinglePDFPage implements DocumentPage, PDFReference {
+	private static final Log log = LogFactory.getLog(SinglePDFPage.class);
 
 	private final String name;
 	private final PDDocument pdf;
 	private final int pageNum;
 	private final PDPage page;
 	private final Image rendered;
 
-	public PDFPage(String name, PDDocument pdf, int pageNum) {
+	public SinglePDFPage(String name, PDDocument pdf, int pageNum) {
 		this.name = name;
 		this.pdf = pdf;
 		this.pageNum = pageNum;

src/de/rogovskyy/reorderpdf/model/WholeDocumentPage.java

@@ -11,7 +11,7 @@
 import javafx.embed.swing.SwingFXUtils;
 import javafx.scene.image.Image;
 
-public class WholeDocumentPage implements DocumentPage{
+public class WholeDocumentPage implements DocumentPage, PDFReference{
 	private static final Log log = LogFactory.getLog(WholeDocumentPage.class);
 
 	private final String docName;