| /* |
| * Copyright 2003-2005 Dave Griffith |
| * |
| * 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.performance; |
| |
| import com.intellij.psi.*; |
| import org.jetbrains.annotations.NotNull; |
| |
| class CanBeStaticVisitor extends JavaRecursiveElementVisitor { |
| private boolean canBeStatic = true; |
| |
| @Override |
| public void visitElement(@NotNull PsiElement element) { |
| if (canBeStatic) { |
| super.visitElement(element); |
| } |
| } |
| |
| @Override |
| public void visitReferenceExpression(@NotNull PsiReferenceExpression ref) { |
| if (!canBeStatic) { |
| return; |
| } |
| super.visitReferenceExpression(ref); |
| final PsiElement element = ref.resolve(); |
| if (element instanceof PsiField) { |
| final PsiField field = (PsiField)element; |
| if (!field.hasModifierProperty(PsiModifier.STATIC)) { |
| canBeStatic = false; |
| } |
| } |
| else if (element instanceof PsiVariable) { |
| //can happen with initializers of inner classes referencing |
| //local variables or parameters from outer class |
| canBeStatic = false; |
| } |
| } |
| |
| public boolean canBeStatic() { |
| return canBeStatic; |
| } |
| } |