added proper GPL notice to some files

src/main/java/de/neemann/digital/core/arithmetic/BarrelShifter.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2016 Helmut Neemann, Rüdiger Heintz
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
 package de.neemann.digital.core.arithmetic;
 
 import de.neemann.digital.core.*;
@@ -10,8 +15,6 @@ import static de.neemann.digital.core.element.PinInfo.input;
 
 /**
  * A barrel shifter
- *
- * @author heintz
  */
 public class BarrelShifter extends Node implements Element {
 

src/main/java/de/neemann/digital/core/arithmetic/BarrelShifterMode.java

@@ -1,7 +1,12 @@
+/*
+ * Copyright (c) 2016 Helmut Neemann, Rüdiger Heintz
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
 package de.neemann.digital.core.arithmetic;
 
 /**
- * @author heintz
+ * the barrel shifter mode
  */
 public enum BarrelShifterMode {
     /**

src/main/java/de/neemann/digital/core/arithmetic/LeftRightFormat.java

@@ -1,10 +1,15 @@
+/*
+ * Copyright (c) 2016 Helmut Neemann, Rüdiger Heintz
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
 package de.neemann.digital.core.arithmetic;
 
 
 import de.neemann.digital.core.ObservableValue;
 
 /**
- * @author heintz
+ * the barrel shifter direction
  */
 public enum LeftRightFormat {
     /**

src/main/java/de/neemann/digital/gui/components/SingleValueDialog.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2016 Helmut Neemann, Rüdiger Heintz
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
 package de.neemann.digital.gui.components;
 
 import de.neemann.digital.core.*;
@@ -19,9 +24,6 @@ import java.util.Arrays;
 /**
  * Dialog to edit a single value.
  * Used to enter a multi bit input value.
- *
- * @author hneemann
- * @author Rüdiger Heintz
  */
 public final class SingleValueDialog extends JDialog implements ModelStateObserverTyped {
 

src/test/java/de/neemann/digital/lang/TestLang.java

@@ -1,3 +1,8 @@
+/*
+ * Copyright (c) 2016 Helmut Neemann
+ * Use of this source code is governed by the GPL v3 license
+ * that can be found in the LICENSE file.
+ */
 package de.neemann.digital.lang;
 
 import de.neemann.digital.integration.Resources;
@@ -11,7 +16,6 @@ import java.util.HashSet;
 import java.util.Map;
 
 /**
- * Created by hneemann on 20.10.16.
  */
 public class TestLang extends TestCase {
     private static final String SOURCEPATH = "/home/hneemann/Dokumente/Java/digital/src/main/java";
@@ -52,7 +56,7 @@ public class TestLang extends TestCase {
         HashSet<String> keys = new HashSet<>();
         parseTree(new File(sources), keys);
         // check also test code. Is needed because documentation generation uses language key also.
-        parseTree(new File(Resources.getRoot(),"../java"), keys);
+        parseTree(new File(Resources.getRoot(), "../java"), keys);
 
         StringBuilder sb = new StringBuilder();
         for (String key : map.keySet()) {
@@ -64,8 +68,8 @@ public class TestLang extends TestCase {
                 }
             }
         }
-        if (sb.length()>0)
+        if (sb.length() > 0)
-            fail("there are unused language keys: "+sb.toString());
+            fail("there are unused language keys: " + sb.toString());
     }
 
     private void parseTree(File file, HashSet<String> keys) throws IOException {
@@ -85,6 +89,8 @@ public class TestLang extends TestCase {
     }
 
     private void checkSourceFile(File f, HashSet<String> keys) throws IOException {
+        int state = 0;
+
         try (BufferedReader r = new BufferedReader(new InputStreamReader(new FileInputStream(f), "utf-8"))) {
             int linecount = 0;
             String line;
@@ -95,8 +101,26 @@ public class TestLang extends TestCase {
                 } catch (AssertionFailedError e) {
                     throw new AssertionFailedError(e.getMessage() + " in line " + linecount);
                 }
+
+                switch (state) {
+                    case 0:
+                        if (line.trim().equals("* Use of this source code is governed by the GPL v3 license"))
+                            state = 1;
+                        break;
+                    case 1:
+                        if (line.trim().equals("* that can be found in the LICENSE file."))
+                            state = 2;
+                        else
+                            state = 0;
+                        break;
+                }
             }
         }
+        if (state != 2)
+            throw new IOException("found file without proper license notice: " + f+ "\n\n"
+                    +"Every java file must contain the lines\n\n"
+            +"* Use of this source code is governed by the GPL v3 license\n"
+            +"* that can be found in the LICENSE file.");
     }
 
     private static final String PATTERN = "Lang.get(\"";