commit 48c5f610023e83e1c1a493850e7046dea4f77ed9
Author: Bronson Graansma <bgraansma@compassion.ca>
Date:   Tue Jul 9 09:01:57 2019 -0400

    first commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..395dde9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.iml
+.idea/
+target/
\ No newline at end of file
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..3655e9e
--- /dev/null
+++ b/pom.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.ingvonic</groupId>
+    <artifactId>pdfCombiner</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.pdfbox</groupId>
+            <artifactId>pdfbox</artifactId>
+            <version>2.0.15</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <artifactId>maven-jar-plugin</artifactId>
+                <version>3.0.0</version>
+                <configuration>
+                    <finalName>PdfCombiner</finalName>
+                    <archive>
+                        <manifest>
+                            <mainClass>PdfCombiner</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>2.4.3</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <minimizeJar>true</minimizeJar>
+                            <shadedArtifactAttached>false</shadedArtifactAttached>
+                            <createDependencyReducedPom>false</createDependencyReducedPom>
+                            <filters>
+                                <filter>
+                                    <artifact>org.apache.pdfbox:pdfbox</artifact>
+                                    <includes>
+                                        <include>**</include>
+                                    </includes>
+                                </filter>
+                                <filter>
+                                    <artifact>commons-logging:commons-logging</artifact>
+                                    <includes>
+                                        <include>**</include>
+                                    </includes>
+                                </filter>
+                            </filters>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <artifactId>maven-dependency-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>copy-dependencies</id>
+                        <phase>prepare-package</phase>
+                        <goals>
+                            <goal>copy-dependencies</goal>
+                        </goals>
+                        <configuration>
+                            <outputDirectory>${project.build.directory}/classes/lib</outputDirectory>
+                            <overWriteReleases>true</overWriteReleases>
+                            <overWriteSnapshots>true</overWriteSnapshots>
+                            <overWriteIfNewer>true</overWriteIfNewer>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>
\ No newline at end of file
diff --git a/src/main/java/FileJList.java b/src/main/java/FileJList.java
new file mode 100644
index 0000000..4cbe81a
--- /dev/null
+++ b/src/main/java/FileJList.java
@@ -0,0 +1,95 @@
+import javax.swing.*;
+import java.awt.datatransfer.DataFlavor;
+import java.awt.datatransfer.StringSelection;
+import java.awt.datatransfer.Transferable;
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A JList that has files as elements, and can be reordered via drag and drop.
+ *
+ * created on 2019-07-05
+ */
+class FileJList extends JList<String> {
+
+    private DefaultListModel<String> view;
+    private List<File> model;
+
+    FileJList() {
+        super();
+
+        view = new DefaultListModel<>();
+        model = new ArrayList<>();
+
+        setModel(view);
+        setDragEnabled(true);
+        setDropMode(DropMode.INSERT);
+        setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
+        setTransferHandler(new DragAndDrop());
+    }
+
+    List<File> getElements() {
+        return new ArrayList<>(model);
+    }
+
+    boolean isEmpty() {
+        return model.isEmpty() && view.isEmpty();
+    }
+
+    void addElement(int i, File file) {
+        model.add(i, file);
+        view.addElement(file.getName());
+    }
+
+    void addElement(File file) {
+        model.add(file);
+        view.addElement(file.getName());
+    }
+
+    File getElement(int i) {
+        return model.get(i);
+    }
+
+    File removeElement(int i) {
+        view.remove(i);
+        return model.remove(i);
+    }
+
+    void clear() {
+        view.clear();
+        model.clear();
+    }
+
+    private class DragAndDrop extends TransferHandler {
+        private int index;
+
+        @Override
+        public int getSourceActions(JComponent comp) {
+            return MOVE;
+        }
+
+        @Override
+        public Transferable createTransferable(JComponent comp) {
+            index = getSelectedIndex();
+            return new StringSelection(getSelectedValue());
+        }
+
+        @Override
+        public void exportDone(JComponent comp, Transferable trans, int action) {
+            removeElement(action == MOVE ? index + 1 : index);
+        }
+
+        @Override
+        public boolean canImport(TransferHandler.TransferSupport support) {
+            return support.isDataFlavorSupported(DataFlavor.stringFlavor);
+        }
+
+        @Override
+        public boolean importData(TransferHandler.TransferSupport support) {
+            JList.DropLocation dl = (JList.DropLocation) support.getDropLocation();
+            addElement(dl.getIndex(), model.get(index));
+            return true;
+        }
+    }
+}
diff --git a/src/main/java/PdfCombiner.java b/src/main/java/PdfCombiner.java
new file mode 100644
index 0000000..f66fee3
--- /dev/null
+++ b/src/main/java/PdfCombiner.java
@@ -0,0 +1,135 @@
+import org.apache.pdfbox.io.MemoryUsageSetting;
+import org.apache.pdfbox.multipdf.PDFMergerUtility;
+
+import javax.swing.*;
+import javax.swing.filechooser.FileNameExtensionFilter;
+import java.awt.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.Arrays;
+
+/**
+ * Simple GUI to quickly merge multiple pdf files into a single pdf file.
+ *
+ * created on 2019-06-25
+ */
+public class PdfCombiner extends JFrame {
+    private FileJList list;
+    private JFileChooser chooser;
+
+    public static void main(String... args) {
+        EventQueue.invokeLater(PdfCombiner::new);
+    }
+
+    private PdfCombiner() {
+        chooser = new JFileChooser();
+        list = new FileJList();
+
+        chooser.setFileFilter(new FileNameExtensionFilter("Portable Document Format", "pdf"));
+
+        setTitle("PDF Combiner");
+        setLocationRelativeTo(null);
+        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+
+        initialize();
+
+        pack();
+
+        setMinimumSize(getSize());
+        setVisible(true);
+    }
+
+    private void initialize() {
+        setLayout(new BorderLayout());
+
+        JScrollPane scroller = new JScrollPane();
+        scroller.setHorizontalScrollBarPolicy(ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
+        scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
+        scroller.setViewportView(list);
+        scroller.setMinimumSize(new Dimension(100, 100));
+
+        add(scroller, BorderLayout.CENTER);
+
+        JPanel bottom = new JPanel(new GridLayout());
+
+        JButton addButton = new JButton("+");
+        addButton.addActionListener(l -> add());
+        bottom.add(addButton);
+
+        JButton removeButton = new JButton("-");
+        removeButton.addActionListener(l -> remove());
+        bottom.add(removeButton);
+
+        JButton clearButton = new JButton("Clear");
+        clearButton.addActionListener(l -> list.clear());
+        bottom.add(clearButton);
+
+        JButton saveButton = new JButton("Save");
+        saveButton.addActionListener(l -> save());
+        bottom.add(saveButton);
+
+        add(bottom, BorderLayout.SOUTH);
+    }
+
+    private void remove() {
+        int[] indices = list.getSelectedIndices();
+
+        if(!list.isEmpty() && indices.length > 0) {
+            Arrays.sort(indices);
+
+            for(int i = indices.length - 1; i >= 0; i--) {
+                list.removeElement(indices[i]);
+            }
+        }
+    }
+
+    private void save() {
+        if(!list.isEmpty()) try {
+            PDFMergerUtility merger = new PDFMergerUtility();
+            for(File pdf : list.getElements()) {
+                merger.addSource(pdf);
+            }
+
+            chooser.setMultiSelectionEnabled(false);
+            chooser.showSaveDialog(this);
+
+            String fileName = chooser.getSelectedFile().getAbsolutePath();
+
+            if(!fileName.toLowerCase().endsWith(".pdf")) {
+                fileName += ".pdf";
+            }
+
+            merger.setDestinationFileName(fileName);
+            merger.mergeDocuments(MemoryUsageSetting.setupTempFileOnly());
+        } catch(FileNotFoundException e) {
+            warn("One or more of the selected files could not be found.");
+        } catch(IOException e) {
+            warn("An error occurred while saving.");
+            e.printStackTrace();
+        } else {
+            warn("No PDFs were provided.");
+        }
+    }
+
+    private void add() {
+        chooser.setMultiSelectionEnabled(true);
+        chooser.showOpenDialog(this);
+
+        for(File pdf : chooser.getSelectedFiles()) {
+            if(!list.getElements().contains(pdf)) {
+                list.addElement(pdf);
+            }
+        }
+    }
+
+    private void warn(String message) {
+        JOptionPane.showConfirmDialog(
+                this,
+                message,
+                "Error",
+                JOptionPane.DEFAULT_OPTION, JOptionPane.PLAIN_MESSAGE,
+                null
+        );
+    }
+}