@Nullable
private LocalQuickFix[] createNPEFixes(
PsiExpression qualifier, PsiExpression expression, boolean onTheFly) {
if (qualifier == null || expression == null) return null;
if (qualifier instanceof PsiMethodCallExpression) return null;
if (qualifier instanceof PsiLiteralExpression
&& ((PsiLiteralExpression) qualifier).getValue() == null) return null;
try {
final List<LocalQuickFix> fixes = new SmartList<LocalQuickFix>();
if (PsiUtil.getLanguageLevel(qualifier).isAtLeast(LanguageLevel.JDK_1_4)) {
final Project project = qualifier.getProject();
final PsiElementFactory elementFactory =
JavaPsiFacade.getInstance(project).getElementFactory();
final PsiBinaryExpression binary =
(PsiBinaryExpression) elementFactory.createExpressionFromText("a != null", null);
binary.getLOperand().replace(qualifier);
fixes.add(new AddAssertStatementFix(binary));
}
addSurroundWithIfFix(qualifier, fixes, onTheFly);
if (ReplaceWithTernaryOperatorFix.isAvailable(qualifier, expression)) {
fixes.add(new ReplaceWithTernaryOperatorFix(qualifier));
}
return fixes.toArray(new LocalQuickFix[fixes.size()]);
} catch (IncorrectOperationException e) {
LOG.error(e);
return null;
}
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
if (!FileModificationService.getInstance()
.preparePsiElementForWrite(descriptor.getPsiElement())) return;
final PsiElement psiElement = descriptor.getPsiElement();
if (psiElement instanceof PsiInstanceOfExpression) {
try {
final PsiExpression compareToNull =
JavaPsiFacade.getInstance(psiElement.getProject())
.getElementFactory()
.createExpressionFromText(
((PsiInstanceOfExpression) psiElement).getOperand().getText() + " != null",
psiElement.getParent());
psiElement.replace(compareToNull);
} catch (IncorrectOperationException e) {
LOG.error(e);
}
}
}