new inference: accept deep nested lambdas (IDEA-125264)

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/newLambda/DeepNestedLambdaExpressionsNoFormalParams.java

@@ -0,0 +1,70 @@
+
+import java.util.List;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+
+abstract class Simplified {
+  public List<Integer> gerFirstTriangles() {
+    return flatMap(() -> flatMap(() -> map(z -> 1))).collect(Collectors.toList());
+  }
+
+  abstract <R> R flatMap(Supplier<R> mapper);
+  abstract <R> Stream<R> map(Function<Integer, R> mapper);
+}
+
+class PythagoreanTriangles {
+
+  static class Triplet<T,U,R>{
+    private T t;
+    private U u;
+    private R r;
+
+    public Triplet(T t, U u, R r){
+      this.t = t;
+      this.u = u;
+      this.r = r;
+    }
+
+    @Override
+    public String toString() {
+      return t.toString() + "," + u.toString() + "," + r.toString();
+    }
+  }
+
+  public void pythagoreanTriangles(Integer num){
+    Stream<Integer> numbers = IntStream.rangeClosed(1,num).boxed();
+
+    Stream<Triplet<Integer, Integer, Integer>> triangles = numbers.flatMap(x -> {
+      return IntStream.rangeClosed(1, x).boxed().flatMap(y -> {
+        return IntStream.rangeClosed(1, y).boxed().filter(z -> {
+          return x * x == y * y + z * z;
+        }).map(z1 -> new Triplet<Integer, Integer, Integer>(x, y, z1));
+      });
+    });
+
+    triangles.forEach(System.out::println);
+
+  }
+
+  public List<Triplet<Integer, Integer, Integer>> gerFirstTriangles(long num){
+    Stream<Integer> infinity = Stream.iterate(1, (n) -> n + 1);
+    return infinity.flatMap(x -> {
+      return IntStream.rangeClosed(1, x).boxed().flatMap(y -> {
+        return IntStream.rangeClosed(1, y).boxed().filter(z -> {
+          return x * x == y * y + z * z;
+        }).map(z1 -> new Triplet<Integer, Integer, Integer>(x, y, z1));
+      });
+    }).limit(num).collect(Collectors.toList());
+  }
+
+
+  public static void main(String[] args) {
+    PythagoreanTriangles triangles = new PythagoreanTriangles();
+    triangles.pythagoreanTriangles(10);
+    triangles.gerFirstTriangles(5l).forEach(System.out::println);
+  }
+}