private static boolean isCollectCall(PsiStatement body, final PsiParameter parameter) {
PsiIfStatement ifStatement = extractIfStatement(body);
final PsiMethodCallExpression methodCallExpression = extractAddCall(body, ifStatement);
if (methodCallExpression != null) {
final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression();
final PsiExpression qualifierExpression = methodExpression.getQualifierExpression();
PsiClass qualifierClass = null;
if (qualifierExpression instanceof PsiReferenceExpression) {
if (ReferencesSearch.search(parameter, new LocalSearchScope(qualifierExpression))
.findFirst()
!= null) {
return false;
}
final PsiElement resolve = ((PsiReferenceExpression) qualifierExpression).resolve();
if (resolve instanceof PsiVariable) {
if (ReferencesSearch.search(
resolve, new LocalSearchScope(methodCallExpression.getArgumentList()))
.findFirst()
!= null) {
return false;
}
}
qualifierClass = PsiUtil.resolveClassInType(qualifierExpression.getType());
} else if (qualifierExpression == null) {
final PsiClass enclosingClass = PsiTreeUtil.getParentOfType(body, PsiClass.class);
if (PsiUtil.getEnclosingStaticElement(body, enclosingClass) == null) {
qualifierClass = enclosingClass;
}
}
if (qualifierClass != null
&& InheritanceUtil.isInheritor(
qualifierClass, false, CommonClassNames.JAVA_UTIL_COLLECTION)) {
while (ifStatement != null && PsiTreeUtil.isAncestor(body, ifStatement, false)) {
final PsiExpression condition = ifStatement.getCondition();
if (condition != null
&& isConditionDependsOnUpdatedCollections(condition, qualifierExpression))
return false;
ifStatement = PsiTreeUtil.getParentOfType(ifStatement, PsiIfStatement.class);
}
final PsiElement resolve = methodExpression.resolve();
if (resolve instanceof PsiMethod
&& "add".equals(((PsiMethod) resolve).getName())
&& ((PsiMethod) resolve).getParameterList().getParametersCount() == 1) {
final PsiExpression[] args = methodCallExpression.getArgumentList().getExpressions();
if (args.length == 1) {
if (args[0] instanceof PsiCallExpression) {
final PsiMethod method = ((PsiCallExpression) args[0]).resolveMethod();
return method != null && !method.hasTypeParameters() && !isThrowsCompatible(method);
}
return true;
}
}
}
}
return false;
}
private static String createFiltersChainText(
PsiStatement body, PsiParameter parameter, PsiIfStatement ifStatement) {
final List<String> filters = new ArrayList<String>();
while (ifStatement != null && PsiTreeUtil.isAncestor(body, ifStatement, false)) {
final PsiExpression condition = ifStatement.getCondition();
if (condition != null) {
filters.add(
".filter("
+ compoundLambdaOrMethodReference(
parameter,
condition,
"java.util.function.Predicate",
new PsiType[] {parameter.getType()})
+ ")");
}
ifStatement = PsiTreeUtil.getParentOfType(ifStatement, PsiIfStatement.class);
}
Collections.reverse(filters);
return StringUtil.join(filters, "");
}
private static void simplifyRedundantCast(PsiElement result) {
final PsiMethodReferenceExpression methodReferenceExpression =
PsiTreeUtil.findChildOfType(result, PsiMethodReferenceExpression.class);
if (methodReferenceExpression != null) {
final PsiElement parent = methodReferenceExpression.getParent();
if (parent instanceof PsiTypeCastExpression) {
if (RedundantCastUtil.isCastRedundant((PsiTypeCastExpression) parent)) {
final PsiExpression operand = ((PsiTypeCastExpression) parent).getOperand();
LOG.assertTrue(operand != null);
parent.replace(operand);
}
}
}
}
private static void restoreComments(PsiForeachStatement foreachStatement, PsiStatement body) {
final PsiElement parent = foreachStatement.getParent();
for (PsiElement comment : PsiTreeUtil.findChildrenOfType(body, PsiComment.class)) {
parent.addBefore(comment, foreachStatement);
}
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
final PsiForeachStatement foreachStatement =
PsiTreeUtil.getParentOfType(descriptor.getPsiElement(), PsiForeachStatement.class);
if (foreachStatement != null) {
if (!FileModificationService.getInstance().preparePsiElementForWrite(foreachStatement))
return;
final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
PsiStatement body = foreachStatement.getBody();
final PsiExpression iteratedValue = foreachStatement.getIteratedValue();
if (body != null && iteratedValue != null) {
final PsiParameter parameter = foreachStatement.getIterationParameter();
final PsiIfStatement ifStatement = extractIfStatement(body);
final PsiMethodCallExpression methodCallExpression = extractAddCall(body, ifStatement);
if (methodCallExpression == null) return;
if (isAddAllCall(foreachStatement, body)) {
restoreComments(foreachStatement, body);
final PsiExpression qualifierExpression =
methodCallExpression.getMethodExpression().getQualifierExpression();
final String qualifierText =
qualifierExpression != null ? qualifierExpression.getText() : "";
final String callText =
StringUtil.getQualifiedName(
qualifierText, "addAll(" + getIteratedValueText(iteratedValue) + ");");
PsiElement result =
foreachStatement.replace(
elementFactory.createStatementFromText(callText, foreachStatement));
reformatWhenNeeded(project, result);
return;
}
final StringBuilder builder =
new StringBuilder(getIteratedValueText(iteratedValue) + ".stream()");
builder.append(createFiltersChainText(body, parameter, ifStatement));
builder.append(
createMapperFunctionalExpressionText(
parameter, methodCallExpression.getArgumentList().getExpressions()[0]));
builder.append(".collect(java.util.stream.Collectors.");
PsiElement result = null;
try {
final PsiExpression qualifierExpression =
methodCallExpression.getMethodExpression().getQualifierExpression();
if (qualifierExpression instanceof PsiReferenceExpression) {
final PsiElement resolve = ((PsiReferenceExpression) qualifierExpression).resolve();
if (resolve instanceof PsiVariable) {
if (resolve instanceof PsiLocalVariable
&& foreachStatement.equals(
PsiTreeUtil.skipSiblingsForward(
resolve.getParent(), PsiWhiteSpace.class))) {
final PsiExpression initializer = ((PsiVariable) resolve).getInitializer();
if (initializer instanceof PsiNewExpression) {
final PsiExpressionList argumentList =
((PsiNewExpression) initializer).getArgumentList();
if (argumentList != null && argumentList.getExpressions().length == 0) {
restoreComments(foreachStatement, body);
final String callText =
builder.toString()
+ createInitializerReplacementText(
((PsiVariable) resolve).getType(), initializer)
+ ")";
result =
initializer.replace(
elementFactory.createExpressionFromText(callText, null));
simplifyRedundantCast(result);
foreachStatement.delete();
return;
}
}
}
}
}
restoreComments(foreachStatement, body);
final String qualifierText =
qualifierExpression != null ? qualifierExpression.getText() : "";
final String callText =
StringUtil.getQualifiedName(
qualifierText, "addAll(" + builder.toString() + "toList()));");
result =
foreachStatement.replace(
elementFactory.createStatementFromText(callText, foreachStatement));
simplifyRedundantCast(result);
} finally {
reformatWhenNeeded(project, result);
}
}
}
}
@Override
public void applyFix(@NotNull Project project, @NotNull ProblemDescriptor descriptor) {
final PsiForeachStatement foreachStatement =
PsiTreeUtil.getParentOfType(descriptor.getPsiElement(), PsiForeachStatement.class);
if (foreachStatement != null) {
if (!FileModificationService.getInstance().preparePsiElementForWrite(foreachStatement))
return;
PsiStatement body = foreachStatement.getBody();
final PsiExpression iteratedValue = foreachStatement.getIteratedValue();
if (body != null && iteratedValue != null) {
restoreComments(foreachStatement, body);
final PsiParameter parameter = foreachStatement.getIterationParameter();
final PsiIfStatement ifStmt = extractIfStatement(body);
StringBuilder buffer = new StringBuilder(getIteratedValueText(iteratedValue));
if (ifStmt != null) {
final PsiStatement thenBranch = ifStmt.getThenBranch();
LOG.assertTrue(thenBranch != null);
buffer.append(".stream()");
buffer.append(createFiltersChainText(body, parameter, ifStmt));
body = thenBranch;
}
buffer.append(".").append(getForEachMethodName()).append("(");
final String functionalExpressionText =
createForEachFunctionalExpressionText(project, body, parameter);
final PsiElementFactory elementFactory = JavaPsiFacade.getElementFactory(project);
PsiExpressionStatement callStatement =
(PsiExpressionStatement)
elementFactory.createStatementFromText(
buffer.toString() + functionalExpressionText + ");", foreachStatement);
callStatement = (PsiExpressionStatement) foreachStatement.replace(callStatement);
final PsiExpressionList argumentList =
((PsiCallExpression) callStatement.getExpression()).getArgumentList();
LOG.assertTrue(argumentList != null, callStatement.getText());
final PsiExpression[] expressions = argumentList.getExpressions();
LOG.assertTrue(expressions.length == 1);
if (expressions[0] instanceof PsiFunctionalExpression
&& ((PsiFunctionalExpression) expressions[0]).getFunctionalInterfaceType() == null) {
callStatement =
(PsiExpressionStatement)
callStatement.replace(
elementFactory.createStatementFromText(
buffer.toString()
+ "("
+ parameter.getText()
+ ") -> "
+ wrapInBlock(body)
+ ");",
callStatement));
}
simplifyRedundantCast(callStatement);
CodeStyleManager.getInstance(project)
.reformat(
JavaCodeStyleManager.getInstance(project).shortenClassReferences(callStatement));
}
}
}