@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;
}
}
private static PsiMethodReferenceExpression createMethodReference(
PsiMethodReferenceExpression expression, PsiTypeElement typeElement) {
final PsiType type = typeElement.getType();
final PsiElementFactory elementFactory =
JavaPsiFacade.getElementFactory(expression.getProject());
final PsiMethodReferenceExpression copy = (PsiMethodReferenceExpression) expression.copy();
copy.getQualifierType()
.replace(elementFactory.createTypeElement(((PsiClassType) type).rawType()));
return copy;
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
PsiElement element = descriptor.getStartElement();
if (!(element instanceof PsiLoopStatement)) return;
PsiLoopStatement loop = (PsiLoopStatement) element;
IteratorDeclaration declaration;
declaration = IteratorDeclaration.fromLoop(loop);
if (declaration == null) return;
PsiStatement body = loop.getBody();
if (!(body instanceof PsiBlockStatement)) return;
PsiStatement[] statements = ((PsiBlockStatement) body).getCodeBlock().getStatements();
PsiElementFactory factory = JavaPsiFacade.getElementFactory(project);
String replacement = null;
CommentTracker ct = new CommentTracker();
if (statements.length == 2 && statements[1] instanceof PsiIfStatement) {
PsiVariable variable = declaration.getNextElementVariable(statements[0]);
if (variable == null) return;
PsiExpression condition = ((PsiIfStatement) statements[1]).getCondition();
if (condition == null) return;
replacement = generateRemoveIf(declaration, ct, condition, variable.getName());
} else if (statements.length == 1 && statements[0] instanceof PsiIfStatement) {
PsiExpression condition = ((PsiIfStatement) statements[0]).getCondition();
if (condition == null) return;
PsiElement ref = declaration.findOnlyIteratorRef(condition);
if (ref != null) {
PsiElement call = ref.getParent().getParent();
if (!declaration.isIteratorMethodCall(call, "next")) return;
PsiType type = ((PsiExpression) call).getType();
JavaCodeStyleManager javaCodeStyleManager = JavaCodeStyleManager.getInstance(project);
SuggestedNameInfo info =
javaCodeStyleManager.suggestVariableName(VariableKind.PARAMETER, null, null, type);
if (info.names.length == 0) {
info =
javaCodeStyleManager.suggestVariableName(
VariableKind.PARAMETER, "value", null, type);
}
String paramName =
javaCodeStyleManager.suggestUniqueVariableName(info, condition, true).names[0];
ct.replace(call, factory.createIdentifier(paramName));
replacement = generateRemoveIf(declaration, ct, condition, paramName);
}
}
if (replacement == null) return;
ct.delete(declaration.getIterator());
PsiElement result = ct.replaceAndRestoreComments(loop, replacement);
LambdaCanBeMethodReferenceInspection.replaceAllLambdasWithMethodReferences(result);
CodeStyleManager.getInstance(project).reformat(result);
}