IDEA-165790 Stream API migration: support distinct() with collect(toList())

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/afterDistinctCollect.java

@@ -0,0 +1,12 @@
+// "Replace with collect" "true"
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class Main {
+  List<String> test(List<String> list) {
+      List<String> result = list.stream().distinct().filter(s -> !s.contains("foo")).collect(Collectors.toList());
+      return result;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/afterDistinctCollectLimit.java

@@ -0,0 +1,13 @@
+// "Replace with collect" "true"
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class Main {
+  List<String> test(Map<String, List<String>> map, int limit) {
+      List<String> list = map.entrySet().stream().filter(entry -> entry.getValue() != null).flatMap(entry -> entry.getValue().stream()).distinct().limit(limit).collect(Collectors.toList());
+      return list;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeDistinctCollect.java

@@ -0,0 +1,20 @@
+// "Replace with collect" "true"
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+  List<String> test(List<String> list) {
+    List<String> result = new ArrayList<>();
+    for(String s : li<caret>st) {
+      if(result.contains(s)) {
+        continue;
+      }
+      if(s.contains("foo")) {
+        continue;
+      }
+      result.add(s);
+    }
+    return result;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeDistinctCollectLimit.java

@@ -0,0 +1,22 @@
+// "Replace with collect" "true"
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  List<String> test(Map<String, List<String>> map, int limit) {
+    List<String> list = new ArrayList<>();
+    for (Map.Entry<String, List<String>> entry : map.<caret>entrySet()) {
+      if(entry.getValue() != null) {
+        for(String str : entry.getValue()) {
+          if (!list.contains(str)) {
+            list.add(str);
+          }
+          if (list.size() >= limit) return list;
+        }
+      }
+    }
+    return list;
+  }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/streamApiMigration/beforeDistinctCollectWrongItem.java

@@ -0,0 +1,20 @@
+// "Replace with collect" "false"
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Main {
+  List<String> test(List<String> list) {
+    List<String> result = new ArrayList<>();
+    for (String s : li<caret>st) {
+      if (result.contains(s)) {
+        continue;
+      }
+      if (s.contains("foo")) {
+        continue;
+      }
+      result.add(s + s);
+    }
+    return result;
+  }
+}