private static String createInitializerReplacementText(
PsiType varType, PsiExpression initializer) {
final PsiType initializerType = initializer.getType();
final PsiClassType rawType =
initializerType instanceof PsiClassType
? ((PsiClassType) initializerType).rawType()
: null;
final PsiClassType rawVarType =
varType instanceof PsiClassType ? ((PsiClassType) varType).rawType() : null;
if (rawType != null
&& rawVarType != null
&& rawType.equalsToText(CommonClassNames.JAVA_UTIL_ARRAY_LIST)
&& rawVarType.equalsToText(CommonClassNames.JAVA_UTIL_LIST)) {
return "toList()";
} else if (rawType != null
&& rawVarType != null
&& rawType.equalsToText(CommonClassNames.JAVA_UTIL_HASH_SET)
&& rawVarType.equalsToText(CommonClassNames.JAVA_UTIL_SET)) {
return "toSet()";
} else if (rawType != null) {
return "toCollection(" + rawType.getClassName() + "::new)";
} else {
return "toCollection(() -> " + initializer.getText() + ")";
}
}
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 getIteratedValueText(PsiExpression iteratedValue) {
return iteratedValue instanceof PsiCallExpression
|| iteratedValue instanceof PsiReferenceExpression
|| iteratedValue instanceof PsiQualifiedExpression
|| iteratedValue instanceof PsiParenthesizedExpression
? iteratedValue.getText()
: "(" + iteratedValue.getText() + ")";
}
private static String compoundLambdaOrMethodReference(
PsiParameter parameter,
PsiExpression expression,
String samQualifiedName,
PsiType[] samParamTypes) {
String result = "";
final Project project = parameter.getProject();
final JavaPsiFacade psiFacade = JavaPsiFacade.getInstance(project);
final PsiClass functionClass =
psiFacade.findClass(samQualifiedName, GlobalSearchScope.allScope(project));
for (int i = 0; i < samParamTypes.length; i++) {
if (samParamTypes[i] instanceof PsiPrimitiveType) {
samParamTypes[i] = ((PsiPrimitiveType) samParamTypes[i]).getBoxedType(expression);
}
}
final PsiClassType functionalInterfaceType =
functionClass != null
? psiFacade.getElementFactory().createType(functionClass, samParamTypes)
: null;
final PsiParameter[] parameters = {parameter};
final String methodReferenceText =
LambdaCanBeMethodReferenceInspection.convertToMethodReference(
expression, parameters, functionalInterfaceType, null);
if (methodReferenceText != null) {
LOG.assertTrue(functionalInterfaceType != null);
result += "(" + functionalInterfaceType.getCanonicalText() + ")" + methodReferenceText;
} else {
result += parameter.getName() + " -> " + expression.getText();
}
return result;
}
private static String createMapperFunctionalExpressionText(
PsiParameter parameter, PsiExpression expression) {
String iteration = "";
if (!isIdentityMapping(parameter, expression)) {
iteration += ".map(";
iteration +=
compoundLambdaOrMethodReference(
parameter,
expression,
"java.util.function.Function",
new PsiType[] {parameter.getType(), expression.getType()});
iteration += ")";
}
return iteration;
}
private static boolean isConditionDependsOnUpdatedCollections(
PsiExpression condition, PsiExpression qualifierExpression) {
final PsiElement collection =
qualifierExpression instanceof PsiReferenceExpression
? ((PsiReferenceExpression) qualifierExpression).resolve()
: null;
if (collection != null) {
return ReferencesSearch.search(collection, new LocalSearchScope(condition)).findFirst()
!= null;
}
final boolean[] dependsOnCollection = {false};
condition.accept(
new JavaRecursiveElementWalkingVisitor() {
@Override
public void visitMethodCallExpression(PsiMethodCallExpression expression) {
super.visitMethodCallExpression(expression);
final PsiExpression callQualifier =
expression.getMethodExpression().getQualifierExpression();
if (callQualifier == null
|| callQualifier instanceof PsiThisExpression
&& ((PsiThisExpression) callQualifier).getQualifier() == null
|| callQualifier instanceof PsiSuperExpression
&& ((PsiSuperExpression) callQualifier).getQualifier() == null) {
dependsOnCollection[0] = true;
}
}
@Override
public void visitThisExpression(PsiThisExpression expression) {
super.visitThisExpression(expression);
if (expression.getQualifier() == null
&& expression.getParent() instanceof PsiExpressionList) {
dependsOnCollection[0] = true;
}
}
@Override
public void visitClass(PsiClass aClass) {}
@Override
public void visitLambdaExpression(PsiLambdaExpression expression) {}
});
return dependsOnCollection[0];
}
@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);
}
}
}
}