started internationalization

src/main/java/de/neemann/digital/core/BurnException.java

@@ -1,10 +1,12 @@
 package de.neemann.digital.core;
 
+import de.neemann.digital.lang.Lang;
+
 /**
  * @author hneemann
  */
 public class BurnException extends NodeException {
     public BurnException(Node node, ObservableValue... values) {
-        super("burnException", node, values);
+        super(Lang.get("err_burnError"), node, values);
     }
 }

src/main/java/de/neemann/digital/core/Model.java

@@ -1,6 +1,7 @@
 package de.neemann.digital.core;
 
 import de.neemann.digital.core.wiring.Clock;
+import de.neemann.digital.lang.Lang;
 
 import java.util.ArrayList;
 import java.util.Collection;
@@ -34,7 +35,7 @@ public class Model {
 
     public <T extends Node> T add(T node) {
         if (isInitialized)
-            throw new RuntimeException("is already initialized!");
+            throw new RuntimeException(Lang.get("err_isAlreadyInitialized"));
 
         nodes.add(node);
         node.setModel(this);
@@ -82,7 +83,7 @@ public class Model {
         int counter = 0;
         while (needsUpdate()) {
             if (counter++ > maxCounter) {
-                throw new NodeException("seemsToOscillate", nodesToUpdateNext.get(0));
+                throw new NodeException(Lang.get("err_seemsToOscillate"), nodesToUpdateNext.get(0));
             }
             doMicroStep(noise);
         }
@@ -102,7 +103,7 @@ public class Model {
      */
     public void doMicroStep(boolean noise) throws NodeException {
         if (!isInitialized)
-            throw new RuntimeException("notInitialized!");
+            throw new RuntimeException(Lang.get("err_notInitialized"));
 
         fireEvent(ModelEvent.STEP);
 

src/main/java/de/neemann/digital/core/ObservableValue.java

@@ -1,5 +1,7 @@
 package de.neemann.digital.core;
 
+import de.neemann.digital.lang.Lang;
+
 import java.util.ArrayList;
 
 /**
@@ -97,7 +99,7 @@ public class ObservableValue extends Value {
 
     public ObservableValue checkBits(int bits, Node node) throws BitsException {
         if (this.bits != bits) {
-            throw new BitsException("needs " + bits + " bits, found " + this.bits, node, this);
+            throw new BitsException(Lang.get("err_needs_N0_bits_found_N2_bits", bits, this.bits), node, this);
         }
         return this;
     }

src/main/java/de/neemann/digital/core/SpeedTest.java

@@ -1,6 +1,7 @@
 package de.neemann.digital.core;
 
 import de.neemann.digital.core.wiring.Clock;
+import de.neemann.digital.lang.Lang;
 
 import java.util.ArrayList;
 
@@ -18,9 +19,9 @@ public class SpeedTest {
     public double calculate() throws NodeException {
         ArrayList<Clock> clocks = model.getClocks();
         if (clocks.isEmpty())
-            throw new NodeException("NoClockFound", null);
+            throw new NodeException(Lang.get("err_noClockFound"), null);
         else if (clocks.size() > 1)
-            throw new NodeException("MoreThenOneClocksFound", null);
+            throw new NodeException(Lang.get("err_moreThenOneClocksFound"), null);
 
 
         Clock clock = clocks.get(0);

src/main/java/de/neemann/digital/core/element/AttributeKey.java

@@ -1,26 +1,30 @@
 package de.neemann.digital.core.element;
 
+import de.neemann.digital.core.memory.DataField;
+import de.neemann.digital.lang.Lang;
+
 /**
  * @author hneemann
  */
 public class AttributeKey<VALUE> {
 
-    public static final AttributeKey<Integer> Bits = new AttributeKey<>("Data Bits", 1);
-    public static final AttributeKey<Integer> InputCount = new AttributeKey<>("Number of Inputs", 2);
-    public static final AttributeKey<String> Label = new AttributeKey<>("Label", "");
-    public static final AttributeKey<Integer> Value = new AttributeKey<>("Value", 1);
-    public static final AttributeKey<Integer> Default = new AttributeKey<>("Default", 0);
-    public static final AttributeKey<java.awt.Color> Color = new AttributeKey<>("Color", java.awt.Color.RED);
-    public static final AttributeKey<String> InputSplit = new AttributeKey<>("Input Splitting", "");
-    public static final AttributeKey<String> OutputSplit = new AttributeKey<>("Output Splitting", "");
-    public static final AttributeKey<Integer> Frequency = new AttributeKey<>("Frequency", 1);
-    public static final AttributeKey<Integer> SelectorBits = new AttributeKey<>("Selector Bits", 1);
-    public static final AttributeKey<Boolean> Signed = new AttributeKey<>("Signed", false);
+    public static final AttributeKey<Integer> Bits = new AttributeKey<>(Lang.get("key_dataBits"), 1);
+    public static final AttributeKey<Integer> InputCount = new AttributeKey<>(Lang.get("key_numberInputs"), 2);
+    public static final AttributeKey<String> Label = new AttributeKey<>(Lang.get("key_label"), "");
+    public static final AttributeKey<Integer> Value = new AttributeKey<>(Lang.get("key_value"), 1);
+    public static final AttributeKey<Integer> Default = new AttributeKey<>(Lang.get("key_default"), 0);
+    public static final AttributeKey<java.awt.Color> Color = new AttributeKey<>(Lang.get("key_color"), java.awt.Color.RED);
+    public static final AttributeKey<String> InputSplit = new AttributeKey<>(Lang.get("key_inputSplitting"), "");
+    public static final AttributeKey<String> OutputSplit = new AttributeKey<>(Lang.get("key_outputSplitting"), "");
+    public static final AttributeKey<Integer> Frequency = new AttributeKey<>(Lang.get("key_frequency"), 1);
+    public static final AttributeKey<Integer> SelectorBits = new AttributeKey<>(Lang.get("key_selectorBits"), 1);
+    public static final AttributeKey<Boolean> Signed = new AttributeKey<>(Lang.get("key_signed"), false);
+    public static final AttributeKey<DataField> Data = new AttributeKey<>(Lang.get("key_data"), DataField.DEFAULT);
 
     private final String name;
     private final VALUE def;
 
-    public AttributeKey(String name, VALUE def) {
+    private AttributeKey(String name, VALUE def) {
         this.name = name;
         if (def == null)
             throw new NullPointerException();

src/main/java/de/neemann/digital/core/flipflops/JK_FF.java

@@ -54,18 +54,9 @@ public class JK_FF extends Node implements Element {
 
     @Override
     public void setInputs(ObservableValue... inputs) throws BitsException {
-        jVal = inputs[0].addObserver(this);
-        clockVal = inputs[1].addObserver(this);
-        kVal = inputs[2].addObserver(this);
-
-        if (jVal.getBits() != 1)
-            throw new BitsException("wrongBitCount", this, jVal);
-
-        if (kVal.getBits() != 1)
-            throw new BitsException("wrongBitCount", this, kVal);
-
-        if (clockVal.getBits() != 1)
-            throw new BitsException("carryIsABit", this, clockVal);
+        jVal = inputs[0].addObserver(this).checkBits(1, this);
+        clockVal = inputs[1].addObserver(this).checkBits(1, this);
+        kVal = inputs[2].addObserver(this).checkBits(1, this);
     }
 
     @Override

src/main/java/de/neemann/digital/core/flipflops/RS_FF.java

@@ -53,18 +53,9 @@ public class RS_FF extends Node implements Element {
 
     @Override
     public void setInputs(ObservableValue... inputs) throws BitsException {
-        jVal = inputs[0].addObserver(this);
-        clockVal = inputs[1].addObserver(this);
-        kVal = inputs[2].addObserver(this);
-
-        if (jVal.getBits() != 1)
-            throw new BitsException("wrongBitCount", this, jVal);
-
-        if (kVal.getBits() != 1)
-            throw new BitsException("wrongBitCount", this, kVal);
-
-        if (clockVal.getBits() != 1)
-            throw new BitsException("carryIsABit", this, clockVal);
+        jVal = inputs[0].addObserver(this).checkBits(1, this);
+        clockVal = inputs[1].addObserver(this).checkBits(1, this);
+        kVal = inputs[2].addObserver(this).checkBits(1, this);
     }
 
     @Override

src/main/java/de/neemann/digital/core/flipflops/T_FF.java

@@ -47,10 +47,7 @@ public class T_FF extends Node implements Element {
 
     @Override
     public void setInputs(ObservableValue... inputs) throws BitsException {
-        clockVal = inputs[0].addObserver(this);
-
-        if (clockVal.getBits() != 1)
-            throw new BitsException("carryIsABit", this, clockVal);
+        clockVal = inputs[0].addObserver(this).checkBits(1, this);
     }
 
     @Override

src/main/java/de/neemann/digital/core/io/Const.java

@@ -7,6 +7,7 @@ import de.neemann.digital.core.element.AttributeKey;
 import de.neemann.digital.core.element.Element;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.element.ElementTypeDescription;
+import de.neemann.digital.lang.Lang;
 
 /**
  * @author hneemann
@@ -26,7 +27,7 @@ public class Const implements Element {
 
     @Override
     public void setInputs(ObservableValue... inputs) throws NodeException {
-        throw new NodeException("no inputs available!", null);
+        throw new NodeException(Lang.get("err_noInputsAvailable"), null);
     }
 
     @Override

src/main/java/de/neemann/digital/core/io/In.java

@@ -7,6 +7,7 @@ import de.neemann.digital.core.element.AttributeKey;
 import de.neemann.digital.core.element.Element;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.element.ElementTypeDescription;
+import de.neemann.digital.lang.Lang;
 
 /**
  * @author hneemann
@@ -27,7 +28,7 @@ public class In implements Element {
 
     @Override
     public void setInputs(ObservableValue... inputs) throws NodeException {
-        throw new NodeException("no inputs available!", null);
+        throw new NodeException(Lang.get("err_noInputsAvailable"), null);
     }
 
     @Override

src/main/java/de/neemann/digital/core/io/Out.java

@@ -25,14 +25,16 @@ public class Out implements Element {
             .addAttribute(AttributeKey.Label)
             .addAttribute(AttributeKey.Color);
 
+    private final int bits;
     private ObservableValue value;
 
     public Out(ElementAttributes attributes) {
+        bits = attributes.getBits();
     }
 
     @Override
     public void setInputs(ObservableValue... inputs) throws NodeException {
-        value = inputs[0];
+        value = inputs[0].checkBits(bits, null);
     }
 
     @Override

src/main/java/de/neemann/digital/core/memory/DataField.java

@@ -0,0 +1,24 @@
+package de.neemann.digital.core.memory;
+
+/**
+ * @author hneemann
+ */
+public class DataField {
+
+    public static final DataField DEFAULT = new DataField();
+
+    private long[] data;
+
+    public void setData(int addr, long value) {
+        if (addr < data.length)
+            data[addr] = value;
+    }
+
+    public long getData(int addr) {
+        if (addr >= data.length)
+            return 0;
+        else
+            return data[addr];
+    }
+
+}

src/main/java/de/neemann/digital/core/memory/LookUpTable.java

@@ -0,0 +1,72 @@
+package de.neemann.digital.core.memory;
+
+import de.neemann.digital.core.Node;
+import de.neemann.digital.core.NodeException;
+import de.neemann.digital.core.ObservableValue;
+import de.neemann.digital.core.element.AttributeKey;
+import de.neemann.digital.core.element.Element;
+import de.neemann.digital.core.element.ElementAttributes;
+import de.neemann.digital.core.element.ElementTypeDescription;
+
+/**
+ * @author hneemann
+ */
+public class LookUpTable extends Node implements Element {
+
+
+    public static final ElementTypeDescription DESCRIPTION = new ElementTypeDescription(LookUpTable.class) {
+        @Override
+        public String[] getInputNames(ElementAttributes elementAttributes) {
+            int size = elementAttributes.get(AttributeKey.InputCount);
+            String[] names = new String[size];
+            for (int i = 0; i < size; i++)
+                names[i] = "in_" + i;
+            return names;
+        }
+    }
+            .addAttribute(AttributeKey.Bits)
+            .addAttribute(AttributeKey.InputCount)
+            .addAttribute(AttributeKey.Data)
+            .setShortName("LUT");
+
+    private final DataField data;
+    private final int bits;
+    private final ObservableValue output;
+    private ObservableValue[] inputs;
+    private int addr;
+
+    public LookUpTable(ElementAttributes attr) {
+        bits = attr.get(AttributeKey.Bits);
+        output = new ObservableValue("out", bits);
+        data = attr.get(AttributeKey.Data);
+    }
+
+    @Override
+    public void setInputs(ObservableValue... inputs) throws NodeException {
+        this.inputs = inputs;
+        for (int i = 0; i < inputs.length; i++)
+            inputs[i].checkBits(1, this).addObserver(this);
+    }
+
+    @Override
+    public ObservableValue[] getOutputs() {
+        return new ObservableValue[]{output};
+    }
+
+    @Override
+    public void readInputs() throws NodeException {
+        addr = 0;
+        int mask = 1;
+        for (int i = 0; i < inputs.length; i++) {
+            if (inputs[i].getValue() > 0)
+                addr = addr | mask;
+            mask = mask * 2;
+        }
+    }
+
+    @Override
+    public void writeOutputs() throws NodeException {
+        output.setValue(data.getData(addr));
+    }
+
+}

src/main/java/de/neemann/digital/core/wiring/Clock.java

@@ -5,6 +5,7 @@ import de.neemann.digital.core.element.AttributeKey;
 import de.neemann.digital.core.element.Element;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.element.ElementTypeDescription;
+import de.neemann.digital.lang.Lang;
 import de.process.utils.gui.ErrorMessage;
 
 import javax.swing.*;
@@ -29,7 +30,7 @@ public class Clock implements Element {
 
     @Override
     public void setInputs(ObservableValue... inputs) throws NodeException {
-        throw new NodeException("no inputs available!", null);
+        throw new NodeException(Lang.get("err_noInputsAvailable"), null);
     }
 
     @Override

src/main/java/de/neemann/digital/core/wiring/Multiplexer.java

@@ -7,6 +7,7 @@ import de.neemann.digital.core.basic.FanIn;
 import de.neemann.digital.core.element.AttributeKey;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.element.ElementTypeDescription;
+import de.neemann.digital.lang.Lang;
 
 import java.util.Arrays;
 
@@ -56,6 +57,6 @@ public class Multiplexer extends FanIn {
         super.setInputs(in);
 
         if (in.length != (1 << selectorBits))
-            throw new BitsException("selectorInputCountMismatch", this, selector);
+            throw new BitsException(Lang.get("err_selectorInputCountMismatch"), this, selector);
     }
 }

src/main/java/de/neemann/digital/core/wiring/Splitter.java

@@ -5,6 +5,7 @@ import de.neemann.digital.core.element.AttributeKey;
 import de.neemann.digital.core.element.Element;
 import de.neemann.digital.core.element.ElementAttributes;
 import de.neemann.digital.core.element.ElementTypeDescription;
+import de.neemann.digital.lang.Lang;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -50,13 +51,13 @@ public class Splitter implements Element {
     @Override
     public void setInputs(ObservableValue... inputs) throws NodeException {
         if (inPorts.getBits() != outPorts.getBits())
-            throw new BitsException("splitterBitsMismatch", null, combine(inputs, outputs));
+            throw new BitsException(Lang.get("err_splitterBitsMismatch"), null, combine(inputs, outputs));
 
         this.inputs = inputs;
         for (int i = 0; i < inputs.length; i++) {
             Port inPort = inPorts.getPort(i);
             if (inPort.getBits() != inputs[i].getBits())
-                throw new BitsException("splitterBitsMismatch", null, inputs[i]);
+                throw new BitsException(Lang.get("err_splitterBitsMismatch"), null, inputs[i]);
         }
 
         for (Port out : outPorts)

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

@@ -2,6 +2,7 @@ package de.neemann.digital.gui.components;
 
 import de.neemann.digital.core.element.AttributeKey;
 import de.neemann.digital.core.element.ElementAttributes;
+import de.neemann.digital.lang.Lang;
 import de.process.utils.gui.ErrorMessage;
 
 import javax.swing.*;
@@ -17,7 +18,7 @@ public class AttributeDialog extends JDialog {
     private final ArrayList<EditorHolder> editors;
 
     public AttributeDialog(Point pos, ArrayList<AttributeKey> list, ElementAttributes elementAttributes) {
-        super((Frame) null, "Attributes", true);
+        super((Frame) null, Lang.get("attr_dialogTitle"), true);
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 
         JPanel panel = new JPanel(new GridLayout(0, 2));
@@ -30,17 +31,17 @@ public class AttributeDialog extends JDialog {
             panel.add(new JLabel(key.getName() + ":  "));
             Editor e = EditorFactory.INSTANCE.create(key.getValueClass(), elementAttributes.get(key));
             editors.add(new EditorHolder(e, key));
-            panel.add(e.getComponent());
+            panel.add(e.getComponent(elementAttributes));
         }
 
-        JButton okButton = new JButton(new AbstractAction("ok") {
+        JButton okButton = new JButton(new AbstractAction(Lang.get("ok")) {
             @Override
             public void actionPerformed(ActionEvent e) {
                 try {
                     setEditedValues(elementAttributes);
                     dispose();
                 } catch (RuntimeException err) {
-                    new ErrorMessage("Error editing a value").addCause(err).setComponent(AttributeDialog.this).show();
+                    new ErrorMessage(Lang.get("msg_errorEditingValue")).addCause(err).setComponent(AttributeDialog.this).show();
                 }
             }
         });

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

@@ -1,5 +1,7 @@
 package de.neemann.digital.gui.components;
 
+import de.neemann.digital.core.element.ElementAttributes;
+
 import java.awt.*;
 
 /**
@@ -7,7 +9,7 @@ import java.awt.*;
  */
 public interface Editor<T> {
 
-    Component getComponent();
+    Component getComponent(ElementAttributes elementAttributes);
 
     T getValue();
 }

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

@@ -1,5 +1,9 @@
 package de.neemann.digital.gui.components;
 
+import de.neemann.digital.core.element.ElementAttributes;
+import de.neemann.digital.core.memory.DataField;
+import de.neemann.digital.lang.Lang;
+
 import javax.swing.*;
 import java.awt.*;
 import java.awt.event.ActionEvent;
@@ -19,6 +23,7 @@ public final class EditorFactory {
         add(Integer.class, IntegerEditor.class);
         add(Color.class, ColorEditor.class);
         add(Boolean.class, BooleanEditor.class);
+        add(DataField.class, DataFieldEditor.class);
     }
 
     public <T> void add(Class<T> clazz, Class<? extends Editor<T>> editor) {
@@ -47,7 +52,7 @@ public final class EditorFactory {
         }
 
         @Override
-        public Component getComponent() {
+        public Component getComponent(ElementAttributes attr) {
             return text;
         }
 
@@ -67,7 +72,7 @@ public final class EditorFactory {
         }
 
         @Override
-        public Component getComponent() {
+        public Component getComponent(ElementAttributes attr) {
             return comboBox;
         }
 
@@ -91,7 +96,7 @@ public final class EditorFactory {
         }
 
         @Override
-        public Component getComponent() {
+        public Component getComponent(ElementAttributes attr) {
             return bool;
         }
 
@@ -112,7 +117,7 @@ public final class EditorFactory {
             button = new JButton(new AbstractAction() {
                 @Override
                 public void actionPerformed(ActionEvent e) {
-                    Color col = JColorChooser.showDialog(button, "Color", color);
+                    Color col = JColorChooser.showDialog(button, Lang.get("msg_color"), color);
                     if (col != null) {
                         color = col;
                         button.setBackground(color);
@@ -123,7 +128,7 @@ public final class EditorFactory {
         }
 
         @Override
-        public Component getComponent() {
+        public Component getComponent(ElementAttributes attr) {
             return button;
         }
 
@@ -133,4 +138,25 @@ public final class EditorFactory {
         }
     }
 
+    private static class DataFieldEditor implements Editor<DataField> {
+
+        private final DataField data;
+
+        public DataFieldEditor(DataField data) {
+            this.data = data;
+        }
+
+        @Override
+        public Component getComponent(ElementAttributes attr) {
+            JPanel panel = new JPanel(new FlowLayout());
+            panel.add(new JButton(Lang.get("btn_edit")));
+            panel.add(new JButton(Lang.get("btn_load")));
+            return panel;
+        }
+
+        @Override
+        public DataField getValue() {
+            return data;
+        }
+    }
 }

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

@@ -1,5 +1,6 @@
 package de.neemann.digital.gui.components;
 
+import de.neemann.digital.lang.Lang;
 import de.process.utils.gui.ToolTipAction;
 
 import javax.swing.*;
@@ -33,7 +34,7 @@ public class ElementOrderer<T> extends JDialog {
                     list.setSelectedIndex(i - 1);
                 }
             }
-        }.setToolTip("move item up").createJButton());
+        }.setToolTip(Lang.get("tt_moveItemUp")).createJButton());
         buttons.add(new ToolTipAction("\u2193") {
             @Override
             public void actionPerformed(ActionEvent e) {
@@ -44,7 +45,7 @@ public class ElementOrderer<T> extends JDialog {
                 }
 
             }
-        }.setToolTip("move item up").createJButton());
+        }.setToolTip(Lang.get("tt_moveItemDown")).createJButton());
         getContentPane().add(buttons, BorderLayout.EAST);
 
         pack();

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

@@ -1,6 +1,7 @@
 package de.neemann.digital.gui.components;
 
 import de.neemann.digital.core.ObservableValue;
+import de.neemann.digital.lang.Lang;
 
 import javax.swing.*;
 import java.awt.*;
@@ -15,7 +16,7 @@ public class SingleValueDialog extends JDialog {
     private String returnText;
 
     public SingleValueDialog(Point pos, String text) {
-        super((Frame) null, "Attributes", true);
+        super((Frame) null, Lang.get("attr_dialogTitle"), true);
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
 
         JTextField textField = new JTextField(30);

src/main/java/de/neemann/digital/gui/draw/library/ElementLibrary.java

@@ -13,6 +13,7 @@ import de.neemann.digital.core.flipflops.T_FF;
 import de.neemann.digital.core.io.Const;
 import de.neemann.digital.core.io.In;
 import de.neemann.digital.core.io.Out;
+import de.neemann.digital.core.memory.LookUpTable;
 import de.neemann.digital.core.wiring.*;
 
 import java.util.ArrayList;
@@ -36,7 +37,7 @@ public class ElementLibrary implements Iterable<ElementLibrary.ElementContainer>
         add(XOr.DESCRIPTION, "Logic");
         add(XNOr.DESCRIPTION, "Logic");
         add(Not.DESCRIPTION, "Logic");
-        add(Delay.DESCRIPTION, "Logic");
+        add(LookUpTable.DESCRIPTION, "Logic");
 
         add(In.DESCRIPTION, "IO");
         add(Out.DESCRIPTION, "IO");
@@ -50,6 +51,7 @@ public class ElementLibrary implements Iterable<ElementLibrary.ElementContainer>
 
         add(Splitter.DESCRIPTION, "Wires");
         add(Const.DESCRIPTION, "Wires");
+        add(Delay.DESCRIPTION, "Wires");
 
         add(RS_FF.DESCRIPTION, "FlipFlops");
         add(JK_FF.DESCRIPTION, "FlipFlops");

src/main/java/de/neemann/digital/lang/Lang.java

@@ -0,0 +1,44 @@
+package de.neemann.digital.lang;
+
+import java.text.MessageFormat;
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
+
+/**
+ * @author hneemann
+ */
+public class Lang {
+
+    private static class InstanceHolder {
+        static final Lang INSTANCE = new Lang();
+    }
+
+    public static String get(String key, Object... params) {
+        return InstanceHolder.INSTANCE.getKey(key, params);
+    }
+
+    private ResourceBundle bundle;
+
+    private Lang() {
+        Locale currentLocale = Locale.getDefault();
+        try {
+            bundle = ResourceBundle.getBundle("lang/lang", currentLocale);
+        } catch (MissingResourceException e) {
+            bundle = ResourceBundle.getBundle("lang/lang", Locale.ENGLISH);
+        }
+    }
+
+    private String getKey(String key, Object... params) {
+        try {
+            String str = bundle.getString(key);
+            if (params != null && params.length > 0)
+                str = MessageFormat.format(str, params);
+            return str;
+        } catch (MissingResourceException e) {
+            System.out.println(key + "=" + key.substring(key.indexOf("_") + 1));
+            return key + " is missing";
+        }
+    }
+
+}