use parentId to express child-parent relation

platform/platform-api/src/com/intellij/openapi/options/ConfigurableEP.java

@@ -53,7 +53,7 @@ public class ConfigurableEP<T extends UnnamedConfigurable> extends AbstractExten
 
   public String getDisplayName() {
     if (displayName != null) return displayName;
-    LOG.assertTrue(bundle != null, "Bundle missed for " + this);
+    LOG.assertTrue(bundle != null, "Bundle missed for " + instanceClass);
     final ResourceBundle resourceBundle = AbstractBundle.getResourceBundle(bundle, myPluginDescriptor.getPluginClassLoader());
     return displayName = CommonBundle.message(resourceBundle, key);
   }
@@ -68,6 +68,9 @@ public class ConfigurableEP<T extends UnnamedConfigurable> extends AbstractExten
   @Attribute("childrenEPName")
   public String childrenEPName;
 
+  @Attribute("parentId")
+  public String parentId;
+
   public ConfigurableEP[] getChildren() {
     for (ConfigurableEP child : children) {
       child.myPicoContainer = myPicoContainer;
@@ -146,6 +149,11 @@ public class ConfigurableEP<T extends UnnamedConfigurable> extends AbstractExten
     return null;
   }
 
+  @Override
+  public String toString() {
+    return getDisplayName();
+  }
+
   private class InstanceFromProviderFactory extends AtomicNotNullLazyValue<ConfigurableProvider> implements NullableFactory<T> {
     public T create() {
       return (T)getValue().createConfigurable();

platform/platform-impl/src/com/intellij/openapi/options/ex/ConfigurableWrapper.java

@@ -134,6 +134,20 @@ public class ConfigurableWrapper implements SearchableConfigurable {
     return myEp.id == null ? myEp.instanceClass : myEp.id;
   }
 
+
+  public String getParentId() {
+    return myEp.parentId;
+  }
+
+  public ConfigurableWrapper addChild(Configurable configurable) {
+    return new CompositeWrapper(myEp, configurable);
+  }
+
+  @Override
+  public String toString() {
+    return getDisplayName();
+  }
+
   @Nullable
   @Override
   public Runnable enableSearch(String option) {
@@ -143,11 +157,10 @@ public class ConfigurableWrapper implements SearchableConfigurable {
 
   private static class CompositeWrapper extends ConfigurableWrapper implements Configurable.Composite {
 
-    private final Configurable[] myKids;
+    private Configurable[] myKids;
 
-    public CompositeWrapper(ConfigurableEP ep) {
+    public CompositeWrapper(ConfigurableEP ep, Configurable... kids) {
       super(ep);
-      Configurable[] kids;
       if (ep.children == null) {
         kids = EMPTY_ARRAY;
       }
@@ -171,5 +184,11 @@ public class ConfigurableWrapper implements SearchableConfigurable {
     public Configurable[] getConfigurables() {
       return myKids;
     }
+
+    @Override
+    public ConfigurableWrapper addChild(Configurable configurable) {
+      myKids = ArrayUtil.append(myKids, configurable);
+      return this;
+    }
   }
 }