| /* |
| * Copyright 2003-2014 Dave Griffith, Bas Leijdekkers |
| * |
| * 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.memory; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.InheritanceUtil; |
| import com.intellij.psi.util.PsiTreeUtil; |
| import com.siyeh.ig.psiutils.ParenthesesUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| class InnerClassReferenceVisitor extends JavaRecursiveElementVisitor { |
| |
| private final PsiClass innerClass; |
| private boolean referencesStaticallyAccessible = true; |
| |
| public InnerClassReferenceVisitor(@NotNull PsiClass innerClass) { |
| this.innerClass = innerClass; |
| } |
| |
| public boolean canInnerClassBeStatic() { |
| final PsiClass superClass = innerClass.getSuperClass(); |
| if (!isClassStaticallyAccessible(superClass)) { |
| return false; |
| } |
| return referencesStaticallyAccessible; |
| } |
| |
| private boolean isClassStaticallyAccessible(PsiClass aClass) { |
| if (PsiTreeUtil.isAncestor(innerClass, aClass, false) || aClass.hasModifierProperty(PsiModifier.STATIC)) { |
| return true; |
| } |
| final PsiClass containingClass = aClass.getContainingClass(); |
| return containingClass == null || InheritanceUtil.isInheritorOrSelf(innerClass, containingClass, true); |
| } |
| |
| @Override |
| public void visitThisExpression(@NotNull PsiThisExpression expression) { |
| if (!referencesStaticallyAccessible) { |
| return; |
| } |
| super.visitThisExpression(expression); |
| if (hasContainingClassQualifier(expression)) { |
| referencesStaticallyAccessible = false; |
| } |
| } |
| |
| @Override |
| public void visitSuperExpression(@NotNull PsiSuperExpression expression) { |
| if (!referencesStaticallyAccessible) { |
| return; |
| } |
| super.visitSuperExpression(expression); |
| if (hasContainingClassQualifier(expression)) { |
| referencesStaticallyAccessible = false; |
| } |
| } |
| |
| private boolean hasContainingClassQualifier(PsiQualifiedExpression expression) { |
| final PsiJavaCodeReferenceElement qualifier = expression.getQualifier(); |
| if (qualifier == null) { |
| return false; |
| } |
| return !innerClass.equals(qualifier.resolve()); |
| } |
| |
| @Override |
| public void visitReferenceExpression(PsiReferenceExpression expression) { |
| if (!referencesStaticallyAccessible) { |
| return; |
| } |
| super.visitReferenceExpression(expression); |
| final PsiExpression qualifierExpression = ParenthesesUtils.stripParentheses(expression.getQualifierExpression()); |
| if (qualifierExpression != null) { |
| return; |
| } |
| final PsiElement target = expression.resolve(); |
| if (target instanceof PsiLocalVariable || target instanceof PsiParameter) { |
| return; |
| } |
| if (target instanceof PsiMethod || target instanceof PsiField) { |
| final PsiMember member = (PsiMember)target; |
| if (member.hasModifierProperty(PsiModifier.STATIC) || PsiTreeUtil.isAncestor(innerClass, member, true)) { |
| return; |
| } |
| if (!member.hasModifierProperty(PsiModifier.PRIVATE)) { |
| final PsiClass containingClass = member.getContainingClass(); |
| if (InheritanceUtil.isInheritorOrSelf(innerClass, containingClass, true)) { |
| return; |
| } |
| } |
| referencesStaticallyAccessible = false; |
| } |
| } |
| |
| @Override |
| public void visitNewExpression(PsiNewExpression expression) { |
| if (!referencesStaticallyAccessible) { |
| return; |
| } |
| super.visitNewExpression(expression); |
| final PsiJavaCodeReferenceElement classReference = expression.getClassOrAnonymousClassReference(); |
| if (classReference == null) { |
| return; |
| } |
| final PsiElement target = classReference.resolve(); |
| if (!(target instanceof PsiClass)) { |
| return; |
| } |
| if (!isClassStaticallyAccessible((PsiClass)target)) { |
| referencesStaticallyAccessible = false; |
| } |
| } |
| } |