@Nullable
static HighlightInfo checkCannotWriteToFinal(
@NotNull PsiExpression expression, @NotNull PsiFile containingFile) {
PsiReferenceExpression reference = null;
boolean readBeforeWrite = false;
if (expression instanceof PsiAssignmentExpression) {
final PsiAssignmentExpression assignmentExpression = (PsiAssignmentExpression) expression;
final PsiExpression left =
PsiUtil.skipParenthesizedExprDown(assignmentExpression.getLExpression());
if (left instanceof PsiReferenceExpression) {
reference = (PsiReferenceExpression) left;
}
readBeforeWrite = assignmentExpression.getOperationTokenType() != JavaTokenType.EQ;
} else if (expression instanceof PsiPostfixExpression) {
final PsiExpression operand =
PsiUtil.skipParenthesizedExprDown(((PsiPostfixExpression) expression).getOperand());
final IElementType sign = ((PsiPostfixExpression) expression).getOperationTokenType();
if (operand instanceof PsiReferenceExpression
&& (sign == JavaTokenType.PLUSPLUS || sign == JavaTokenType.MINUSMINUS)) {
reference = (PsiReferenceExpression) operand;
}
readBeforeWrite = true;
} else if (expression instanceof PsiPrefixExpression) {
final PsiExpression operand =
PsiUtil.skipParenthesizedExprDown(((PsiPrefixExpression) expression).getOperand());
final IElementType sign = ((PsiPrefixExpression) expression).getOperationTokenType();
if (operand instanceof PsiReferenceExpression
&& (sign == JavaTokenType.PLUSPLUS || sign == JavaTokenType.MINUSMINUS)) {
reference = (PsiReferenceExpression) operand;
}
readBeforeWrite = true;
}
final PsiElement resolved = reference == null ? null : reference.resolve();
PsiVariable variable = resolved instanceof PsiVariable ? (PsiVariable) resolved : null;
if (variable == null || !variable.hasModifierProperty(PsiModifier.FINAL)) return null;
final boolean canWrite =
canWriteToFinal(variable, expression, reference, containingFile)
&& checkWriteToFinalInsideLambda(variable, reference) == null;
if (readBeforeWrite || !canWrite) {
final String name = variable.getName();
String description =
canWrite
? JavaErrorMessages.message("variable.not.initialized", name)
: JavaErrorMessages.message("assignment.to.final.variable", name);
final HighlightInfo highlightInfo =
HighlightInfo.newHighlightInfo(HighlightInfoType.ERROR)
.range(reference.getTextRange())
.descriptionAndTooltip(description)
.create();
final PsiElement innerClass = getInnerClassVariableReferencedFrom(variable, expression);
if (innerClass == null || variable instanceof PsiField) {
QuickFixAction.registerQuickFixAction(
highlightInfo,
QUICK_FIX_FACTORY.createModifierListFix(variable, PsiModifier.FINAL, false, false));
} else {
QuickFixAction.registerQuickFixAction(
highlightInfo,
QUICK_FIX_FACTORY.createVariableAccessFromInnerClassFix(variable, innerClass));
}
return highlightInfo;
}
return null;
}
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
if (!myField.isValid()) return; // weird. should not get here when field becomes invalid
final Collection<PsiReference> refs = ReferencesSearch.search(myField).findAll();
if (refs.isEmpty()) return;
Set<PsiReference> refsSet = new HashSet<PsiReference>(refs);
PsiCodeBlock anchorBlock = findAnchorBlock(refs);
if (anchorBlock == null)
return; // was assert, but need to fix the case when obsolete inspection highlighting is
// left
if (!CodeInsightUtil.preparePsiElementsForWrite(anchorBlock)) return;
final PsiElementFactory elementFactory =
JavaPsiFacade.getInstance(project).getElementFactory();
final JavaCodeStyleManager styleManager = JavaCodeStyleManager.getInstance(project);
final String propertyName =
styleManager.variableNameToPropertyName(myField.getName(), VariableKind.FIELD);
String localName =
styleManager.propertyNameToVariableName(propertyName, VariableKind.LOCAL_VARIABLE);
localName = RefactoringUtil.suggestUniqueVariableName(localName, anchorBlock, myField);
PsiElement firstElement = getFirstElement(refs);
boolean mayBeFinal = mayBeFinal(refsSet, firstElement);
PsiElement newDeclaration = null;
try {
final PsiElement anchor = getAnchorElement(anchorBlock, firstElement);
if (anchor instanceof PsiExpressionStatement
&& ((PsiExpressionStatement) anchor).getExpression()
instanceof PsiAssignmentExpression) {
final PsiAssignmentExpression expression =
(PsiAssignmentExpression) ((PsiExpressionStatement) anchor).getExpression();
if (expression.getOperationTokenType() == JavaTokenType.EQ
&& expression.getLExpression() instanceof PsiReferenceExpression
&& ((PsiReference) expression.getLExpression()).isReferenceTo(myField)) {
final PsiExpression initializer = expression.getRExpression();
final PsiDeclarationStatement decl =
elementFactory.createVariableDeclarationStatement(
localName, myField.getType(), initializer);
if (!mayBeFinal) {
PsiUtil.setModifierProperty(
((PsiModifierListOwner) decl.getDeclaredElements()[0]), PsiModifier.FINAL, false);
}
newDeclaration = anchor.replace(decl);
refsSet.remove(expression.getLExpression());
retargetReferences(elementFactory, localName, refsSet);
} else {
newDeclaration =
addDeclarationWithFieldInitializerAndRetargetReferences(
elementFactory, localName, anchorBlock, anchor, refsSet);
}
} else {
newDeclaration =
addDeclarationWithFieldInitializerAndRetargetReferences(
elementFactory, localName, anchorBlock, anchor, refsSet);
}
} catch (IncorrectOperationException e) {
LOG.error(e);
}
if (newDeclaration != null) {
final PsiFile psiFile = myField.getContainingFile();
final Editor editor = FileEditorManager.getInstance(project).getSelectedTextEditor();
if (editor != null && IJSwingUtilities.hasFocus(editor.getComponent())) {
final PsiFile file =
PsiDocumentManager.getInstance(project).getPsiFile(editor.getDocument());
if (file == psiFile) {
editor.getCaretModel().moveToOffset(newDeclaration.getTextOffset());
editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
}
}
}
try {
myField.normalizeDeclaration();
myField.delete();
} catch (IncorrectOperationException e) {
LOG.error(e);
}
}