IDEA-162945 Stream API migration: support cases where variable is modified and reassigned

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

@@ -0,0 +1,11 @@
+// "Replace with sum()" "true"
+
+import java.io.BufferedReader;
+import java.io.IOException;
+
+public class Main {
+  void test(BufferedReader br) throws IOException {
+      long count = br.lines().map(String::trim).mapToLong(String::length).sum();
+      System.out.println(count);
+  }
+}

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

@@ -0,0 +1,12 @@
+// "Replace with collect" "true"
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class Main {
+  public void test(Map<String, String[]> map) {
+      List<String> result = map.entrySet().stream().filter(entry -> entry.getKey().startsWith("x")).map(Map.Entry::getValue).flatMap(Arrays::stream).map(String::trim).collect(Collectors.toList());
+  }
+}

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

@@ -0,0 +1,15 @@
+// "Replace with sum()" "false"
+
+import java.io.BufferedReader;
+import java.io.IOException;
+
+public class Main {
+  void test(BufferedReader br) throws IOException {
+    String line = "";
+    long count = 0;
+    wh<caret>ile((line = br.readLine()) != null) {
+      count+=(line = line.trim()).length();
+    }
+    System.out.println(count);
+  }
+}

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

@@ -1,4 +1,4 @@
-// "Replace with sum()" "false"
+// "Replace with sum()" "true"
 
 import java.io.BufferedReader;
 import java.io.IOException;

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

@@ -0,0 +1,19 @@
+// "Replace with collect" "true"
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class Main {
+  public void test(Map<String, String[]> map) {
+    List<String> result = new ArrayList<>();
+    for(Map.Entry<String, String[]> entry: m<caret>ap.entrySet()) {
+      if(entry.getKey().startsWith("x")) {
+        String[] arr = entry.getValue();
+        for (String str : arr) {
+          str = str.trim();
+          result.add(str);
+        }
+      }
+    }
+  }
+}