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/*
* 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;
}
}
}
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