From 264c0020e0e0045de7e266bf1f504e45da8de0bd Mon Sep 17 00:00:00 2001
From: Andrei Punko <andd3dfx@gmail.com>
Date: Sat, 26 Oct 2024 22:59:42 +0300
Subject: [PATCH] Remove ending space on each row from result of saving Matrix

---
 src/main/java/by/andd3dfx/util/FileUtil.java  | 27 ++++++++++---------
 .../java/by/andd3dfx/util/FileUtilTest.java   | 16 +++++------
 src/test/resources/matrix-not-original.txt    |  5 ++--
 src/test/resources/matrix-original.txt        |  4 +--
 4 files changed, 26 insertions(+), 26 deletions(-)

diff --git a/src/main/java/by/andd3dfx/util/FileUtil.java b/src/main/java/by/andd3dfx/util/FileUtil.java
index 16d91ad..4f0275d 100644
--- a/src/main/java/by/andd3dfx/util/FileUtil.java
+++ b/src/main/java/by/andd3dfx/util/FileUtil.java
@@ -2,11 +2,13 @@
 
 import by.andd3dfx.math.Interval;
 import by.andd3dfx.math.Matrix;
-import lombok.SneakyThrows;
 
 import java.io.FileWriter;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.function.Function;
+import java.util.stream.Collectors;
 
 /**
  * Util to serialize data into files
@@ -42,24 +44,25 @@ public static void saveFunc(Interval timeInterval, Function<Double, Double> xFun
         serialize(fileName, sb);
     }
 
-    @SneakyThrows
-    public static void save(Matrix m, String fileName, boolean rowsToColumns) {
-        var file = new FileWriter(fileName);
-        if (rowsToColumns) {
+    public static void save(Matrix m, String fileName, boolean rotate) {
+        var sb = new StringBuilder();
+        if (rotate) {
             for (int j = 0; j < m.getN(); j++) {
+                var list = new ArrayList<Double>();
                 for (int i = 0; i < m.getM(); i++) {
-                    file.write(m.get(i, j) + " ");
+                    list.add(m.get(i, j));
                 }
-                file.write("\n");
+                sb.append(list.stream().map(String::valueOf)
+                        .collect(Collectors.joining(" ")) + "\n");
             }
         } else {
             for (int i = 0; i < m.getM(); i++) {
-                for (int j = 0; j < m.getN(); j++) {
-                    file.write(m.get(i, j) + " ");
-                }
-                file.write("\n");
+                var string = Arrays.stream(m.get(i))
+                        .mapToObj(String::valueOf)
+                        .collect(Collectors.joining(" "));
+                sb.append(string + "\n");
             }
         }
-        file.close();
+        serialize(fileName, sb);
     }
 }
diff --git a/src/test/java/by/andd3dfx/util/FileUtilTest.java b/src/test/java/by/andd3dfx/util/FileUtilTest.java
index 84c372e..143c0b8 100644
--- a/src/test/java/by/andd3dfx/util/FileUtilTest.java
+++ b/src/test/java/by/andd3dfx/util/FileUtilTest.java
@@ -46,11 +46,9 @@ void saveFuncForParameterizedXAndY() throws IOException {
     @Test
     void saveMatrixInOriginalView() throws IOException {
         final var fileName = "matrix-original.txt";
-        var m = new Matrix(2, 2);
-        m.set(0, 0, 5);
-        m.set(0, 1, 6);
-        m.set(1, 0, 9);
-        m.set(1, 1, 1);
+        var m = new Matrix(2, 3);
+        m.set(0, new double[]{50, 51, 52});
+        m.set(1, new double[]{65, 66, 67});
 
         FileUtil.save(m, BUILD_PATH + fileName, false);
 
@@ -60,11 +58,9 @@ void saveMatrixInOriginalView() throws IOException {
     @Test
     void saveMatrixWithConversionRowsToColumns() throws IOException {
         final var fileName = "matrix-not-original.txt";
-        var m = new Matrix(2, 2);
-        m.set(0, 0, 5);
-        m.set(0, 1, 6);
-        m.set(1, 0, 9);
-        m.set(1, 1, 1);
+        var m = new Matrix(2, 3);
+        m.set(0, new double[]{50, 51, 52});
+        m.set(1, new double[]{65, 66, 67});
 
         FileUtil.save(m, BUILD_PATH + fileName, true);
 
diff --git a/src/test/resources/matrix-not-original.txt b/src/test/resources/matrix-not-original.txt
index 5836c44..e1ab380 100644
--- a/src/test/resources/matrix-not-original.txt
+++ b/src/test/resources/matrix-not-original.txt
@@ -1,2 +1,3 @@
-5.0 9.0 
-6.0 1.0 
+50.0 65.0
+51.0 66.0
+52.0 67.0
diff --git a/src/test/resources/matrix-original.txt b/src/test/resources/matrix-original.txt
index b2d478f..d322f05 100644
--- a/src/test/resources/matrix-original.txt
+++ b/src/test/resources/matrix-original.txt
@@ -1,2 +1,2 @@
-5.0 6.0 
-9.0 1.0 
+50.0 51.0 52.0
+65.0 66.0 67.0