| /* |
| * Copyright 2003-2008 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.performance; |
| |
| import com.intellij.psi.*; |
| import com.intellij.psi.util.PsiUtil; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.InspectionGadgetsFix; |
| import com.siyeh.ig.fixes.ChangeModifierFix; |
| import com.siyeh.ig.psiutils.ClassUtils; |
| import com.siyeh.ig.psiutils.SideEffectChecker; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class FieldMayBeStaticInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message( |
| "field.may.be.static.display.name"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new FieldMayBeStaticVisitor(); |
| } |
| |
| @Override |
| @NotNull |
| protected String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message( |
| "field.may.be.static.problem.descriptor"); |
| } |
| |
| @Override |
| public InspectionGadgetsFix buildFix(Object... infos) { |
| return new ChangeModifierFix(PsiModifier.STATIC); |
| } |
| |
| private static class FieldMayBeStaticVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitField(@NotNull PsiField field) { |
| if (field.hasModifierProperty(PsiModifier.STATIC)) { |
| return; |
| } |
| if (!field.hasModifierProperty(PsiModifier.FINAL)) { |
| return; |
| } |
| final PsiExpression initializer = field.getInitializer(); |
| if (initializer == null) { |
| return; |
| } |
| if (SideEffectChecker.mayHaveSideEffects(initializer)) { |
| return; |
| } |
| if (!canBeStatic(initializer)) { |
| return; |
| } |
| final PsiType type = field.getType(); |
| if (!ClassUtils.isImmutable(type)) { |
| return; |
| } |
| final PsiClass containingClass = field.getContainingClass(); |
| if (containingClass != null |
| && !containingClass.hasModifierProperty(PsiModifier.STATIC) |
| && containingClass.getContainingClass() != null |
| && !PsiUtil.isCompileTimeConstant(field)) { |
| // inner class cannot have static declarations |
| return; |
| } |
| registerFieldError(field); |
| } |
| |
| private static boolean canBeStatic(PsiExpression initializer) { |
| final CanBeStaticVisitor canBeStaticVisitor = |
| new CanBeStaticVisitor(); |
| initializer.accept(canBeStaticVisitor); |
| return canBeStaticVisitor.canBeStatic(); |
| } |
| } |
| } |