Stream API migration: replace with findFirst().ifPresent() chain

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

@@ -0,0 +1,13 @@
+// "Replace with findFirst()" "true"
+
+import java.util.*;
+
+public class Main {
+  public Integer[] testFindFirstIfPresent(List<List<String>> data) {
+    List<Integer> result = new ArrayList<>();
+    for (List<String> list : data) {
+        list.stream().filter(str -> !str.isEmpty()).findFirst().ifPresent(str -> result.add(str.length()));
+    }
+    return result.toArray(new Integer[result.size()]);
+  }
+}

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

@@ -0,0 +1,18 @@
+// "Replace with findFirst()" "true"
+
+import java.util.*;
+
+public class Main {
+  public Integer[] testFindFirstIfPresent(List<List<String>> data) {
+    List<Integer> result = new ArrayList<>();
+    for (List<String> list : data) {
+      for (String str : lis<caret>t) {
+        if (!str.isEmpty()) {
+          result.add(str.length());
+          break;
+        }
+      }
+    }
+    return result.toArray(new Integer[result.size()]);
+  }
+}

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

@@ -0,0 +1,20 @@
+// "Replace with findFirst()" "false"
+
+import java.util.*;
+
+// The result will have block-lambda so we don't suggest the replacement here
+public class Main {
+  public Integer[] testFindFirstIfPresent(List<List<String>> data) {
+    List<Integer> result = new ArrayList<>();
+    for (List<String> list : data) {
+      for (String str : lis<caret>t) {
+        if (!str.isEmpty()) {
+          result.add(str.length());
+          System.out.println(str);
+          break;
+        }
+      }
+    }
+    return result.toArray(new Integer[result.size()]);
+  }
+}