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 PsiIfStatement extractIfStatement(PsiStatement body) {
PsiIfStatement ifStmt = null;
if (body instanceof PsiIfStatement) {
ifStmt = (PsiIfStatement) body;
} else if (body instanceof PsiBlockStatement) {
final PsiStatement[] statements = ((PsiBlockStatement) body).getCodeBlock().getStatements();
if (statements.length == 1 && statements[0] instanceof PsiIfStatement) {
ifStmt = (PsiIfStatement) statements[0];
}
}
if (ifStmt != null && ifStmt.getElseBranch() == null && ifStmt.getCondition() != null) {
final PsiStatement thenBranch = ifStmt.getThenBranch();
if (thenBranch != null) {
final PsiIfStatement deeperThen = extractIfStatement(thenBranch);
return deeperThen != null ? deeperThen : ifStmt;
}
}
return null;
}
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 PsiMethodCallExpression extractAddCall(
PsiStatement body, PsiIfStatement ifStatement) {
if (ifStatement != null) {
final PsiStatement thenBranch = ifStatement.getThenBranch();
return extractAddCall(thenBranch, null);
}
PsiExpressionStatement stmt = null;
if (body instanceof PsiBlockStatement) {
final PsiStatement[] statements = ((PsiBlockStatement) body).getCodeBlock().getStatements();
if (statements.length == 1 && statements[0] instanceof PsiExpressionStatement) {
stmt = (PsiExpressionStatement) statements[0];
}
} else if (body instanceof PsiExpressionStatement) {
stmt = (PsiExpressionStatement) body;
}
if (stmt != null) {
final PsiExpression expression = stmt.getExpression();
if (expression instanceof PsiMethodCallExpression) {
return (PsiMethodCallExpression) expression;
}
}
return null;
}
@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));
}
}
}