diff --git a/src/main/java/nl/andrewlalis/erme/EntityRelationMappingEditor.java b/src/main/java/nl/andrewlalis/erme/EntityRelationMappingEditor.java
index e50e30b..48a8243 100644
--- a/src/main/java/nl/andrewlalis/erme/EntityRelationMappingEditor.java
+++ b/src/main/java/nl/andrewlalis/erme/EntityRelationMappingEditor.java
@@ -7,30 +7,30 @@ import nl.andrewlalis.erme.view.EditorFrame;
 import java.nio.charset.StandardCharsets;
 
 public class EntityRelationMappingEditor {
-    public static final String VERSION = "1.3.1";
-    private static EditorFrame frame;
+	public static final String VERSION = "1.3.1";
+	private static EditorFrame frame;
 
-    public static EditorFrame getFrame() {
-        return frame;
-    }
+	public static EditorFrame getFrame() {
+		return frame;
+	}
 
-    public static void main(String[] args) {
-        if (!FlatLightLaf.install()) {
-            System.err.println("Could not install FlatLight Look and Feel.");
-        }
-        final boolean includeAdminActions = shouldIncludeAdminActions(args);
-        if (includeAdminActions) {
-            System.out.println("Admin actions have been enabled.");
-        }
-        frame = new EditorFrame(includeAdminActions);
-        frame.setVisible(true);
-    }
+	public static void main(String[] args) {
+		if (!FlatLightLaf.install()) {
+			System.err.println("Could not install FlatLight Look and Feel.");
+		}
+		final boolean includeAdminActions = shouldIncludeAdminActions(args);
+		if (includeAdminActions) {
+			System.out.println("Admin actions have been enabled.");
+		}
+		frame = new EditorFrame(includeAdminActions);
+		frame.setVisible(true);
+	}
 
-    private static boolean shouldIncludeAdminActions(String[] args) {
-        if (args.length < 1) {
-            return false;
-        }
-        byte[] pw = args[0].getBytes(StandardCharsets.UTF_8);
-        return Hash.matches(pw, "admin_hash.txt");
-    }
+	private static boolean shouldIncludeAdminActions(String[] args) {
+		if (args.length < 1) {
+			return false;
+		}
+		byte[] pw = args[0].getBytes(StandardCharsets.UTF_8);
+		return Hash.matches(pw, "admin_hash.txt");
+	}
 }
diff --git a/src/main/java/nl/andrewlalis/erme/control/actions/LolcatAction.java b/src/main/java/nl/andrewlalis/erme/control/actions/LolcatAction.java
index 7fc7d94..d3a9925 100644
--- a/src/main/java/nl/andrewlalis/erme/control/actions/LolcatAction.java
+++ b/src/main/java/nl/andrewlalis/erme/control/actions/LolcatAction.java
@@ -7,21 +7,21 @@ import javax.swing.*;
 import java.awt.event.ActionEvent;
 
 public class LolcatAction extends AbstractAction {
-    private static LolcatAction instance;
-    public static LolcatAction getInstance() {
-        if (instance == null) {
-            instance = new LolcatAction();
-        }
-        return instance;
-    }
+	private static LolcatAction instance;
+	public static LolcatAction getInstance() {
+		if (instance == null) {
+			instance = new LolcatAction();
+		}
+		return instance;
+	}
 
-    public LolcatAction() {
-        super("Toggle Lolcat Mode");
-    }
+	public LolcatAction() {
+		super("Toggle Lolcat Mode");
+	}
 
-    @Override
-    public void actionPerformed(ActionEvent actionEvent) {
-        AttributeViewModel.setLolcatMode(((AbstractButton)actionEvent.getSource()).getModel().isSelected());
-        EntityRelationMappingEditor.getFrame().getContentPane().repaint();
-    }
+	@Override
+	public void actionPerformed(ActionEvent actionEvent) {
+		AttributeViewModel.setLolcatMode(((AbstractButton)actionEvent.getSource()).getModel().isSelected());
+		EntityRelationMappingEditor.getFrame().getContentPane().repaint();
+	}
 }
diff --git a/src/main/java/nl/andrewlalis/erme/view/view_models/AttributeViewModel.java b/src/main/java/nl/andrewlalis/erme/view/view_models/AttributeViewModel.java
index e82d6c6..595b866 100644
--- a/src/main/java/nl/andrewlalis/erme/view/view_models/AttributeViewModel.java
+++ b/src/main/java/nl/andrewlalis/erme/view/view_models/AttributeViewModel.java
@@ -15,98 +15,98 @@ import java.text.AttributedString;
  * View model for rendering a single attribute of a relation.
  */
 public class AttributeViewModel implements ViewModel {
-    public static final int PADDING_X = 5;
-    public static final int PADDING_Y = 5;
-    public static final Color BACKGROUND_COLOR = Color.LIGHT_GRAY;
-    public static final Color FONT_COLOR = Color.BLACK;
-    public static final float FK_FONT_SIZE = 11.0f;
-    private static final float LOLCAT_SAT = 0.75f;
-    private static final float LOLCAT_BRIGHT = 1f;
-    private static boolean lolcatMode;
-    private final Attribute attribute;
+	public static final int PADDING_X = 5;
+	public static final int PADDING_Y = 5;
+	public static final Color BACKGROUND_COLOR = Color.LIGHT_GRAY;
+	public static final Color FONT_COLOR = Color.BLACK;
+	public static final float FK_FONT_SIZE = 11.0f;
+	private static final float LOLCAT_SAT = 0.75f;
+	private static final float LOLCAT_BRIGHT = 1f;
+	private static boolean lolcatMode;
+	private final Attribute attribute;
 
-    public AttributeViewModel(Attribute attribute) {
-        this.attribute = attribute;
-    }
+	public AttributeViewModel(Attribute attribute) {
+		this.attribute = attribute;
+	}
 
-    public static boolean getLolcatMode() {
-        return lolcatMode;
-    }
+	public static boolean getLolcatMode() {
+		return lolcatMode;
+	}
 
-    public static void setLolcatMode(boolean lolcatMode) {
-        AttributeViewModel.lolcatMode = lolcatMode;
-    }
+	public static void setLolcatMode(boolean lolcatMode) {
+		AttributeViewModel.lolcatMode = lolcatMode;
+	}
 
-    @Override
-    public void draw(Graphics2D g) {
-        AttributedString as = this.getAttributedString(g);
-        Rectangle r = this.getBounds(g, as);
-        g.setColor(this.getBackgroundColor(r.x + r.width / 2, r.y + r.height / 2, g));
-        g.fillRect(r.x, r.y, r.width, r.height);
-        g.setColor(FONT_COLOR);
-        g.drawRect(r.x, r.y, r.width, r.height);
-        g.drawString(as.getIterator(), r.x + PADDING_X, r.y + (r.height - PADDING_Y));
-        if (this.attribute instanceof ForeignKeyAttribute) {
-            ForeignKeyAttribute fkAttribute = (ForeignKeyAttribute) this.attribute;
-            Font originalFont = g.getFont();
-            g.setFont(g.getFont().deriveFont(Font.ITALIC, FK_FONT_SIZE));
-            g.drawString(fkAttribute.getFullReferenceName(), r.x + PADDING_X, r.y - PADDING_Y);
-            g.setFont(originalFont);
-        }
-    }
+	@Override
+	public void draw(Graphics2D g) {
+		AttributedString as = this.getAttributedString(g);
+		Rectangle r = this.getBounds(g, as);
+		g.setColor(this.getBackgroundColor(r.x + r.width / 2, r.y + r.height / 2, g));
+		g.fillRect(r.x, r.y, r.width, r.height);
+		g.setColor(FONT_COLOR);
+		g.drawRect(r.x, r.y, r.width, r.height);
+		g.drawString(as.getIterator(), r.x + PADDING_X, r.y + (r.height - PADDING_Y));
+		if (this.attribute instanceof ForeignKeyAttribute) {
+			ForeignKeyAttribute fkAttribute = (ForeignKeyAttribute) this.attribute;
+			Font originalFont = g.getFont();
+			g.setFont(g.getFont().deriveFont(Font.ITALIC, FK_FONT_SIZE));
+			g.drawString(fkAttribute.getFullReferenceName(), r.x + PADDING_X, r.y - PADDING_Y);
+			g.setFont(originalFont);
+		}
+	}
 
-    private Color getBackgroundColor(int x, int y, Graphics2D g) {
-        if (!lolcatMode) return BACKGROUND_COLOR;
-        Dimension viewportSize = ((DiagramPanel)EntityRelationMappingEditor.getFrame().getContentPane()).getModel().getRelationBounds().getSize();
+	private Color getBackgroundColor(int x, int y, Graphics2D g) {
+		if (!lolcatMode) return BACKGROUND_COLOR;
+		Dimension viewportSize = ((DiagramPanel)EntityRelationMappingEditor.getFrame().getContentPane()).getModel().getRelationBounds().getSize();
 
-        double dx = viewportSize.width;
-        double dy = viewportSize.height;
-        double mag = Math.sqrt(dx * dx + dy * dy);
-        dx /= mag;
-        dy /= mag;
+		double dx = viewportSize.width;
+		double dy = viewportSize.height;
+		double mag = Math.sqrt(dx * dx + dy * dy);
+		dx /= mag;
+		dy /= mag;
 
-        double lambda = (dx * x + dy * y);
-        double diag_val = Math.sqrt(Math.pow(dx * lambda, 2) + Math.pow(dy * lambda, 2)) / mag;
+		double lambda = (dx * x + dy * y);
+		double diag_val = Math.sqrt(Math.pow(dx * lambda, 2) + Math.pow(dy * lambda, 2)) / mag;
 
-        return Color.getHSBColor((float) diag_val, LOLCAT_SAT, LOLCAT_BRIGHT);
-    }
+		return Color.getHSBColor((float) diag_val, LOLCAT_SAT, LOLCAT_BRIGHT);
+	}
 
-    @Override
-    public Rectangle getBounds(Graphics2D g) {
-        return this.getBounds(g, this.getAttributedString(g));
-    }
+	@Override
+	public Rectangle getBounds(Graphics2D g) {
+		return this.getBounds(g, this.getAttributedString(g));
+	}
 
-    private Rectangle getBounds(Graphics2D g, AttributedString as) {
-        final RelationViewModel relationViewModel = (RelationViewModel) this.attribute.getRelation().getViewModel();
-        int x = this.attribute.getRelation().getPosition().x + RelationViewModel.PADDING_X;
-        int y = this.attribute.getRelation().getPosition().y + relationViewModel.getNameBounds(g).height + RelationViewModel.ATTRIBUTE_SEPARATION;
-        int i = 0;
-        while (!this.attribute.getRelation().getAttributes().get(i).equals(this.attribute)) {
-            x += this.attribute.getRelation().getAttributes().get(i).getViewModel().getBounds(g).width;
-            i++;
-        }
-        Rectangle2D nameRect = g.getFontMetrics().getStringBounds(as.getIterator(), 0, this.attribute.getName().length(), g);
-        int width = (int) nameRect.getWidth() + (2 * PADDING_X);
-        int height = (int) nameRect.getHeight() + (2 * PADDING_Y);
-        if (this.attribute instanceof ForeignKeyAttribute) {
-            ForeignKeyAttribute fkAttribute = (ForeignKeyAttribute) this.attribute;
-            Font originalFont = g.getFont();
-            g.setFont(g.getFont().deriveFont(Font.ITALIC, FK_FONT_SIZE));
-            Rectangle referenceNameBounds = g.getFontMetrics().getStringBounds(fkAttribute.getFullReferenceName(), g).getBounds();
-            g.setFont(originalFont);
-            width = Math.max(width, referenceNameBounds.width + (2 * PADDING_X));
-        }
-        return new Rectangle(x, y, width, height);
-    }
+	private Rectangle getBounds(Graphics2D g, AttributedString as) {
+		final RelationViewModel relationViewModel = (RelationViewModel) this.attribute.getRelation().getViewModel();
+		int x = this.attribute.getRelation().getPosition().x + RelationViewModel.PADDING_X;
+		int y = this.attribute.getRelation().getPosition().y + relationViewModel.getNameBounds(g).height + RelationViewModel.ATTRIBUTE_SEPARATION;
+		int i = 0;
+		while (!this.attribute.getRelation().getAttributes().get(i).equals(this.attribute)) {
+			x += this.attribute.getRelation().getAttributes().get(i).getViewModel().getBounds(g).width;
+			i++;
+		}
+		Rectangle2D nameRect = g.getFontMetrics().getStringBounds(as.getIterator(), 0, this.attribute.getName().length(), g);
+		int width = (int) nameRect.getWidth() + (2 * PADDING_X);
+		int height = (int) nameRect.getHeight() + (2 * PADDING_Y);
+		if (this.attribute instanceof ForeignKeyAttribute) {
+			ForeignKeyAttribute fkAttribute = (ForeignKeyAttribute) this.attribute;
+			Font originalFont = g.getFont();
+			g.setFont(g.getFont().deriveFont(Font.ITALIC, FK_FONT_SIZE));
+			Rectangle referenceNameBounds = g.getFontMetrics().getStringBounds(fkAttribute.getFullReferenceName(), g).getBounds();
+			g.setFont(originalFont);
+			width = Math.max(width, referenceNameBounds.width + (2 * PADDING_X));
+		}
+		return new Rectangle(x, y, width, height);
+	}
 
-    private AttributedString getAttributedString(Graphics2D g) {
-        AttributedString as = new AttributedString(this.attribute.getName());
-        as.addAttribute(TextAttribute.FONT, g.getFont());
-        if (this.attribute.getType().equals(AttributeType.ID_KEY)) {
-            as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
-        } else if (this.attribute.getType().equals(AttributeType.PARTIAL_ID_KEY)) {
-            as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_LOW_DASHED);
-        }
-        return as;
-    }
+	private AttributedString getAttributedString(Graphics2D g) {
+		AttributedString as = new AttributedString(this.attribute.getName());
+		as.addAttribute(TextAttribute.FONT, g.getFont());
+		if (this.attribute.getType().equals(AttributeType.ID_KEY)) {
+			as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_ON);
+		} else if (this.attribute.getType().equals(AttributeType.PARTIAL_ID_KEY)) {
+			as.addAttribute(TextAttribute.UNDERLINE, TextAttribute.UNDERLINE_LOW_DASHED);
+		}
+		return as;
+	}
 }