Implemented main functionality

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

pom.xml

@@ -8,5 +8,87 @@
     <artifactId>exif-image-rotation-tool</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.7.0</version>
+                <configuration>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <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}/lib</outputDirectory>
+                            <overWriteReleases>false</overWriteReleases>
+                            <overWriteSnapshots>false</overWriteSnapshots>
+                            <overWriteIfNewer>true</overWriteIfNewer>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-jar-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <classpathPrefix>lib/</classpathPrefix>
+                            <mainClass>org.lalber.tools.exifrotation.Main</mainClass>
+                        </manifest>
+                    </archive>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <archive>
+                        <manifest>
+                            <mainClass>org.lalber.tools.exifrotation.Main</mainClass>
+                        </manifest>
+                    </archive>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>make-assembly</id> <!-- this is used for inheritance merges -->
+                        <phase>package</phase> <!-- bind to the packaging phase -->
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+    <repositories>
+        <repository>
+            <id>javaxt.com</id>
+            <url>http://www.javaxt.com/maven</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>javaxt</groupId>
+            <artifactId>javaxt-core</artifactId>
+            <version>1.9.0</version>
+        </dependency>
+    </dependencies>
 
 </project>

src/main/java/org/lalber/tools/exifrotation/Main.java

@@ -0,0 +1,83 @@
+package org.lalber.tools.exifrotation;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import javax.swing.*;
+import javax.swing.border.EtchedBorder;
+import javax.swing.border.TitledBorder;
+import javaxt.io.Image;
+
+/**
+ * @author Lucas Alber
+ */
+public class Main {
+
+    /**
+     * Main entry point to application.
+     *
+     * @param args not used.
+     */
+    public static void main(String[] args) {
+        File folder = showFileSelectionDialog();
+        if (folder == null) return;
+
+        JPanel mainPanel = new JPanel();
+        mainPanel.setBorder(new TitledBorder(new EtchedBorder(), "Process:"));
+
+        JTextArea textArea = new JTextArea(16, 58);
+        textArea.setEditable(false);
+        JScrollPane scroll = new JScrollPane(textArea);
+        scroll.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
+
+        mainPanel.add(scroll);
+
+        JFrame frame = new JFrame();
+        frame.setTitle("Exif Image-Rotation Tool");
+        frame.add(mainPanel);
+        frame.pack();
+        frame.setLocationRelativeTo(null);
+        frame.setVisible(true);
+
+        try {
+            Files.walk(folder.toPath())
+                    .filter(Main::isImage)
+                    .forEach(p -> {
+                        textArea.append("Processing: " + p.getFileName().toString() + "\n");
+                        Image img = new Image(p.toFile());
+                        img.rotate();
+                        img.saveAs(p.toFile());
+                    });
+
+        } catch (IOException e) {
+            System.err.println("Error processing images!");
+            e.printStackTrace();
+        }
+
+        textArea.append("FINISHED!");
+    }
+
+    /**
+     * Shows a Dialog to choose a Directory.
+     * @return the directory or null if the dialog was closed
+     */
+    private static File showFileSelectionDialog() {
+        JFileChooser fileChooser = new JFileChooser();
+        fileChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
+        if (fileChooser.showDialog(null, "OK") != JFileChooser.APPROVE_OPTION)
+            return null;
+        return fileChooser.getSelectedFile();
+    }
+
+    private static boolean isImage(Path p) {
+        try {
+            String content = Files.probeContentType(p);
+            if (content == null) return false;
+            return content.split("/")[0].equals("image");
+        } catch (IOException e) {
+            e.printStackTrace();
+            return false;
+        }
+    }
+}