1 files changed, 91 insertions, 0 deletions
diff --git a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/classlayout/ClassWithOnlyPrivateConstructorsInspectionBase.java b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/classlayout/ClassWithOnlyPrivateConstructorsInspectionBase.java
new file mode 100644
index 000000000000..6d091699ce82
--- /dev/null
+++ b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/classlayout/ClassWithOnlyPrivateConstructorsInspectionBase.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2000-2014 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.siyeh.ig.classlayout;
+
+import com.intellij.psi.PsiClass;
+import com.intellij.psi.PsiMethod;
+import com.intellij.psi.PsiModifier;
+import com.siyeh.InspectionGadgetsBundle;
+import com.siyeh.ig.BaseInspection;
+import com.siyeh.ig.BaseInspectionVisitor;
+import org.jetbrains.annotations.Nls;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * @author Bas Leijdekkers
+ */
+public class ClassWithOnlyPrivateConstructorsInspectionBase extends BaseInspection {
+  @Nls
+  @NotNull
+  @Override
+  public String getDisplayName() {
+    return InspectionGadgetsBundle.message("class.with.only.private.constructors.display.name");
+  }
+
+  @NotNull
+  @Override
+  protected String buildErrorString(Object... infos) {
+    return InspectionGadgetsBundle.message("class.with.only.private.constructors.problem.descriptor");
+  }
+
+  @Override
+  public BaseInspectionVisitor buildVisitor() {
+    return new ClassWithOnlyPrivateConstructorsVisitor();
+  }
+
+  private static class ClassWithOnlyPrivateConstructorsVisitor extends BaseInspectionVisitor {
+
+    @Override
+    public void visitClass(PsiClass aClass) {
+      super.visitClass(aClass);
+      final PsiMethod[] constructors = aClass.getConstructors();
+      if (constructors.length == 0) {
+        return;
+      }
+      for (PsiMethod constructor : constructors) {
+        if (constructor.hasModifierProperty(PsiModifier.FINAL)) {
+          return;
+        }
+      }
+      final PsiClass[] innerClasses = aClass.getInnerClasses();
+      for (PsiClass innerClass : innerClasses) {
+        if (isExtendedByInnerClass(innerClass, aClass, new HashSet<PsiClass>())) {
+          return;
+        }
+      }
+      registerClassError(aClass, aClass);
+    }
+
+    private static boolean isExtendedByInnerClass(PsiClass innerClass, PsiClass superClass, Set<PsiClass> visited) {
+      if (!visited.add(innerClass)) {
+        return false;
+      }
+      if (innerClass.isInheritor(superClass, false)) {
+        return true;
+      }
+      final PsiClass[] innerClasses = innerClass.getInnerClasses();
+      for (PsiClass aClass : innerClasses) {
+        if (isExtendedByInnerClass(aClass, superClass, visited)) {
+          return true;
+        }
+      }
+      return false;
+    }
+  }
+}