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/*
* 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);
if (aClass.isEnum()) {
return;
}
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;
}
}
}
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