12670 - Prevent essential components being accidentally deleted

vassal-app/src/main/java/VASSAL/build/Buildable.java

@@ -54,4 +54,30 @@ public interface Buildable {
    * @return an XML element from which this component can be built
    */
   Element getBuildElement(Document doc);
+
+  /**
+   * Is this component a reqired component within its parent?
+   *
+   * @return  true if component is mandatory
+   */
+  default boolean isMandatory() {
+    return false;
+  }
+
+  /**
+   * Is this component allowed to be moved around the Configure Tree?
+   * @return true is component is movable
+   */
+  default boolean isMovable() {
+    return true;
+  }
+
+  /**
+   * Does this component need to be unique within it's parent?
+   * @return
+   */
+  default boolean isUnique() {
+    return false;
+  }
+
 }

vassal-app/src/main/java/VASSAL/build/GameModule.java

@@ -53,10 +53,7 @@
 import VASSAL.build.module.WizardSupport;
 import VASSAL.build.module.documentation.HelpFile;
 import VASSAL.build.module.folder.ModuleSubFolder;
-import VASSAL.build.module.gamepieceimage.ColorManager;
-import VASSAL.build.module.gamepieceimage.FontManager;
 import VASSAL.build.module.gamepieceimage.GamePieceImageDefinitions;
-import VASSAL.build.module.gamepieceimage.GamePieceLayoutsContainer;
 import VASSAL.build.module.index.IndexManager;
 import VASSAL.build.module.map.CounterDetailViewer;
 import VASSAL.build.module.metadata.AbstractMetaData;
@@ -89,7 +86,7 @@
 import VASSAL.configure.CompoundValidityChecker;
 import VASSAL.configure.ConfigureTree;
 import VASSAL.configure.MandatoryComponent;
-import VASSAL.configure.SingleChildInstance;
+import VASSAL.configure.RecursiveSingleChildInstance;
 import VASSAL.configure.StringArrayConfigurer;
 import VASSAL.configure.StringConfigurer;
 import VASSAL.configure.TextConfigurer;
@@ -106,7 +103,6 @@
 import VASSAL.launch.PlayerWindow;
 import VASSAL.preferences.PositionOption;
 import VASSAL.preferences.Prefs;
-import VASSAL.script.ScriptContainer;
 import VASSAL.script.expression.Expression;
 import VASSAL.tools.ArchiveWriter;
 import VASSAL.tools.CRCUtils;
@@ -130,6 +126,7 @@
 import VASSAL.tools.menu.MenuManager;
 import VASSAL.tools.swing.SwingUtils;
 import VASSAL.tools.version.VersionUtils;
+
 import org.apache.commons.codec.digest.DigestUtils;
 import org.apache.commons.lang3.ArrayUtils;
 import org.apache.commons.lang3.StringUtils;
@@ -680,23 +677,7 @@ public void windowClosing(WindowEvent e) {
     validator = new CompoundValidityChecker(
       new MandatoryComponent(this, Documentation.class),
       new MandatoryComponent(this, GlobalOptions.class))
-      .append(new SingleChildInstance(this, ChessClockControl.class))
-      .append(new SingleChildInstance(this, Documentation.class))
-      .append(new SingleChildInstance(this, GlobalOptions.class))
-      .append(new SingleChildInstance(this, PrototypesContainer.class))
-      .append(new SingleChildInstance(this, ColorManager.class))
-      .append(new SingleChildInstance(this, FontManager.class))
-      .append(new SingleChildInstance(this, GamePieceImageDefinitions.class))
-      .append(new SingleChildInstance(this, GamePieceLayoutsContainer.class))
-      .append(new SingleChildInstance(this, ScriptContainer.class))
-      .append(new SingleChildInstance(this, GlobalTranslatableMessages.class))
-      .append(new SingleChildInstance(this, GlobalProperties.class))
-      .append(new SingleChildInstance(this, Language.class))
-      .append(new SingleChildInstance(this, Documentation.class))
-      .append(new SingleChildInstance(this, PlayerRoster.class))
-      .append(new SingleChildInstance(this, Chatter.class))
-      .append(new SingleChildInstance(this, KeyNamer.class))
-      .append(new SingleChildInstance(this, Localization.class));
+      .append(new RecursiveSingleChildInstance());
 
     addCommandEncoder(new ChangePropertyCommandEncoder(propsContainer));
   }

vassal-app/src/main/java/VASSAL/build/module/Chatter.java

@@ -848,6 +848,16 @@ public void dropActionChanged(DropTargetDragEvent event) {
   public void drop(DropTargetDropEvent dtde) {
     GameModule.getGameModule().getGameState().dropFile(dtde);
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }
 
 

vassal-app/src/main/java/VASSAL/build/module/ChessClockControl.java

@@ -1006,4 +1006,10 @@ public void mousePressed(MouseEvent e) {
       }
     }
   }
+
+  /** There can be only one! */
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/Documentation.java

@@ -151,4 +151,14 @@ public void setAttribute(String name, Object value) {
   public String getAttributeValueString(String name) {
     return null;
   }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/GlobalOptions.java

@@ -949,4 +949,14 @@ public void addImageNamesRecursively(Collection<String> s) {
       s.add(c.getValueString());
     }
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/KeyNamer.java

@@ -110,4 +110,14 @@ public static String getKeyString(KeyStroke k) {
     }
     return StringUtils.capitalize(sb.toString().replace(' ', '_'));
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/Map.java

@@ -89,7 +89,6 @@
 import VASSAL.configure.MandatoryComponent;
 import VASSAL.configure.NamedHotKeyConfigurer;
 import VASSAL.configure.PlayerIdFormattedExpressionConfigurer;
-import VASSAL.configure.SingleChildInstance;
 import VASSAL.configure.UniquelyNamedChildren;
 import VASSAL.configure.VisibilityCondition;
 import VASSAL.counters.BasicPiece;
@@ -965,20 +964,6 @@ public void addTo(Buildable b) {
       new MandatoryComponent(this, BoardPicker.class),
       new MandatoryComponent(this, StackMetrics.class))
       .append(idMgr)
-      .append(new SingleChildInstance(this, Zoomer.class))
-      .append(new SingleChildInstance(this, HighlightLastMoved.class))
-      .append(new SingleChildInstance(this, Scroller.class))
-      .append(new SingleChildInstance(this, ForwardToChatter.class))
-      .append(new SingleChildInstance(this, MenuDisplayer.class))
-      .append(new SingleChildInstance(this, MapCenterer.class))
-      .append(new SingleChildInstance(this, StackExpander.class))
-      .append(new SingleChildInstance(this, PieceMover.class))
-      .append(new SingleChildInstance(this, KeyBufferer.class))
-      .append(new SingleChildInstance(this, ForwardToKeyBuffer.class))
-      .append(new SingleChildInstance(this, GlobalProperties.class))
-      .append(new SingleChildInstance(this, SelectionHighlighters.class))
-      .append(new SingleChildInstance(this, LayeredPieceCollection.class))
-      .append(new SingleChildInstance(this, BoardPicker.class))
       .append(new UniquelyNamedChildren(this, MapShader.class));
 
     final DragGestureListener dgl = dge -> {

vassal-app/src/main/java/VASSAL/build/module/PlayerRoster.java

@@ -1031,4 +1031,14 @@ public ComponentI18nData getI18nData() {
     c.setAttributeTranslatable(SIDES, true);
     return c;
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/PrototypesContainer.java

@@ -193,4 +193,14 @@ public ComponentI18nData getI18nData() {
     data.setPrefix(""); //$NON-NLS-1$
     return data;
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/gamepieceimage/ColorManager.java

@@ -279,4 +279,14 @@ public String[] getColorDisplayNames() {
     }
     return names.toArray(new String[0]);
   }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/gamepieceimage/FontManager.java

@@ -160,4 +160,14 @@ public String[] getFontNames() {
     }
     return names.toArray(new String[0]);
   }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/gamepieceimage/GamePieceImageDefinitions.java

@@ -158,4 +158,14 @@ public GamePieceImage getGenericDefn(String defnName) {
     return definitions.getGenericDefn(defnName);
 
   }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/gamepieceimage/GamePieceLayoutsContainer.java

@@ -123,5 +123,15 @@ public GamePieceImage getGenericDefn(String defnName) {
     }
     return null;
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }
 

vassal-app/src/main/java/VASSAL/build/module/map/BoardPicker.java

@@ -897,4 +897,14 @@ public void repaint() {
   public String[] getAttributeNames() {
     return new String[0];
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/map/ForwardToChatter.java

@@ -73,4 +73,14 @@ private void process(KeyEvent e) {
       GameModule.getGameModule().getChatter().keyCommand(SwingUtils.getKeyStrokeForEvent(e));
     }
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/map/ForwardToKeyBuffer.java

@@ -101,4 +101,14 @@ protected void process(KeyEvent e) {
       }
     }
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/map/HighlightLastMoved.java

@@ -233,4 +233,14 @@ public static String getConfigureTypeName() {
   public Class<?>[] getAllowableConfigureComponents() {
     return new Class<?>[0];
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/map/ImageSaver.java

@@ -458,4 +458,14 @@ public static String getConfigureTypeName() {
   public Class<?>[] getAllowableConfigureComponents() {
     return new Class<?>[0];
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/map/KeyBufferer.java

@@ -680,4 +680,14 @@ public void draw(Graphics g, Map map) {
   public boolean drawAboveCounters() {
     return true;
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }

vassal-app/src/main/java/VASSAL/build/module/map/LayeredPieceCollection.java

@@ -318,4 +318,14 @@ public List<String> getPropertyList() {
     l.addAll(Arrays.asList(collection.layerOrder));
     return l;
   }
+
+  @Override
+  public boolean isMandatory() {
+    return true;
+  }
+
+  @Override
+  public boolean isUnique() {
+    return true;
+  }
 }