IDEA-160789 Migration to Stream API: replace with mapToInt/Long/Double().sum() when possible

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

@@ -0,0 +1,10 @@
+// "Replace with sum()" "true"
+
+import java.util.Arrays;
+
+public class Main {
+  public long test(String[] array) {
+      long i = Arrays.stream(array).filter(a -> a.startsWith("xyz")).mapToLong(String::length).sum();
+      return i;
+  }
+}

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

@@ -0,0 +1,11 @@
+// "Replace with sum()" "true"
+
+import java.util.Arrays;
+
+public class Main {
+  public double test(String[][] array) {
+    double d = 10;
+      d += Arrays.stream(array).filter(arr -> arr != null).flatMap(Arrays::stream).filter(a -> a.startsWith("xyz")).mapToDouble(a -> 1.0 / a.length()).sum();
+    return d;
+  }
+}

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

@@ -0,0 +1,12 @@
+// "Replace with sum()" "true"
+
+public class Main {
+  public long test(String[] array) {
+    long i = 0;
+    for(String a : ar<caret>ray) {
+      if(a.startsWith("xyz"))
+        i = i + a.length();
+    }
+    return i;
+  }
+}

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

@@ -0,0 +1,12 @@
+// "Replace with sum()" "false"
+
+public class Main {
+  public long test(String[] array) {
+    float i = 0;
+    for(String a : ar<caret>ray) {
+      if(a.startsWith("xyz"))
+        i = i + a.length();
+    }
+    return i;
+  }
+}

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

@@ -0,0 +1,16 @@
+// "Replace with sum()" "true"
+
+public class Main {
+  public double test(String[][] array) {
+    double d = 10;
+    for(String[] arr : arra<caret>y) {
+      if(arr != null) {
+        for (String a : arr) {
+          if (a.startsWith("xyz"))
+            d = d + 1.0/a.length();
+        }
+      }
+    }
+    return d;
+  }
+}