Merge remote-tracking branches 'origin/feature/sorting' and 'origin/feature/even-only-sort-strategy' into feature/ui

app/src/main/java/ru/project/sorting/BubbleSortStrategy.java

@@ -0,0 +1,24 @@
+package ru.project.sorting;
+
+import ru.project.list.MyList;
+import java.util.Comparator;
+
+public class BubbleSortStrategy<T> implements SortStrategy<T> {
+
+    @Override
+    public void sort(MyList<T> list, Comparator<T> comparator) {
+        if (list == null || list.size() <= 1) {
+            return;
+        }
+        int n = list.size();
+        for (int i = 0; i < n - 1; i++) {
+            for (int j = 0; j < n - i - 1; j++) {
+                if (comparator.compare(list.get(j), list.get(j + 1)) > 0) {
+                    T temp = list.get(j);
+                    list.set(j, list.get(j + 1));
+                    list.set(j + 1, temp);
+                }
+            }
+        }
+    }
+}

app/src/main/java/ru/project/sorting/EvenOnlyMergeSortStrategy.java

@@ -0,0 +1,84 @@
+package ru.project.sorting;
+
+import ru.project.list.MyList;
+import java.util.ArrayList;
+import java.util.Comparator;
+import java.util.List;
+import java.util.function.ToIntFunction;
+
+public class EvenOnlyMergeSortStrategy<T> implements SortStrategy<T> {
+
+    private final ToIntFunction<T> valueExtractor;
+
+    public EvenOnlyMergeSortStrategy(ToIntFunction<T> valueExtractor) {
+        this.valueExtractor = valueExtractor;
+    }
+
+    @Override
+    public void sort(MyList<T> list, Comparator<T> comparator) {
+        if (list == null || list.size() <= 1) {
+            return;
+        }
+
+        List<Integer> evenIndices = new ArrayList<>();
+        List<T> evenElements = new ArrayList<>();
+
+        for (int i = 0; i < list.size(); i++) {
+            T element = list.get(i);
+            int value = valueExtractor.applyAsInt(element);
+            if (value % 2 == 0) {
+                evenIndices.add(i);
+                evenElements.add(element);
+            }
+        }
+
+        if (evenElements.size() <= 1) {
+            return;
+        }
+
+        List<T> sortedEven = mergeSort(evenElements, comparator);
+
+        for (int j = 0; j < evenIndices.size(); j++) {
+            list.set(evenIndices.get(j), sortedEven.get(j));
+        }
+    }
+
+    private List<T> mergeSort(List<T> list, Comparator<T> comparator) {
+        if (list.size() <= 1) {
+            return list;
+        }
+
+        int mid = list.size() / 2;
+        List<T> left = mergeSort(list.subList(0, mid), comparator);
+        List<T> right = mergeSort(list.subList(mid, list.size()), comparator);
+
+        return merge(left, right, comparator);
+    }
+
+    private List<T> merge(List<T> left, List<T> right, Comparator<T> comparator) {
+        List<T> result = new ArrayList<>();
+        int i = 0, j = 0;
+
+        while (i < left.size() && j < right.size()) {
+            if (comparator.compare(left.get(i), right.get(j)) <= 0) {
+                result.add(left.get(i));
+                i++;
+            } else {
+                result.add(right.get(j));
+                j++;
+            }
+        }
+
+        while (i < left.size()) {
+            result.add(left.get(i));
+            i++;
+        }
+
+        while (j < right.size()) {
+            result.add(right.get(j));
+            j++;
+        }
+
+        return result;
+    }
+}

app/src/main/java/ru/project/sorting/EvenOnlySortStrategy.java

@@ -0,0 +1,94 @@
+package ru.project.sorting;
+
+import ru.project.collection.MyLinkedList;
+import ru.project.collection.MyList;
+
+import java.util.Comparator;
+import java.util.function.ToIntFunction;
+
+public class EvenOnlySortStrategy<T> implements SortStrategy<T> {
+
+    private SortStrategy<T> sortStrategy;
+    private ToIntFunction<T> valueExtractor;
+
+    public EvenOnlySortStrategy() {
+    }
+
+    public EvenOnlySortStrategy(SortStrategy<T> sortStrategy) {
+        setSortStrategy(sortStrategy);
+    }
+
+    public EvenOnlySortStrategy(
+            SortStrategy<T> sortStrategy,
+            ToIntFunction<T> valueExtractor
+    ) {
+        setSortStrategy(sortStrategy);
+        setValueExtractor(valueExtractor);
+    }
+
+    public void setSortStrategy(SortStrategy<T> sortStrategy) {
+        if (sortStrategy == null) {
+            throw new IllegalArgumentException("Sort strategy must not be null");
+        }
+
+        this.sortStrategy = sortStrategy;
+    }
+
+    public void setValueExtractor(ToIntFunction<T> valueExtractor) {
+        if (valueExtractor == null) {
+            throw new IllegalArgumentException("Value extractor must not be null");
+        }
+
+        this.valueExtractor = valueExtractor;
+    }
+
+    @Override
+    public void sort(MyList<T> list, Comparator<T> comparator) {
+        if (sortStrategy == null) {
+            throw new IllegalStateException("Sort strategy is not set");
+        }
+
+        if (valueExtractor == null) {
+            throw new IllegalStateException("Value extractor is not set");
+        }
+
+        if (list == null || list.size() <= 1) {
+            return;
+        }
+
+        int evenCount = 0;
+
+        for (int i = 0; i < list.size(); i++) {
+            T element = list.get(i);
+
+            if (valueExtractor.applyAsInt(element) % 2 == 0) {
+                evenCount++;
+            }
+        }
+
+        if (evenCount <= 1) {
+            return;
+        }
+
+        MyList<T> evenElements = new MyLinkedList<>();
+        int[] evenIndexes = new int[evenCount];
+
+        int evenIndex = 0;
+
+        for (int i = 0; i < list.size(); i++) {
+            T element = list.get(i);
+
+            if (valueExtractor.applyAsInt(element) % 2 == 0) {
+                evenElements.add(element);
+                evenIndexes[evenIndex] = i;
+                evenIndex++;
+            }
+        }
+
+        sortStrategy.sort(evenElements, comparator);
+
+        for (int i = 0; i < evenIndexes.length; i++) {
+            list.set(evenIndexes[i], evenElements.get(i));
+        }
+    }
+}

app/src/main/java/ru/project/sorting/MergeSortStrategy.java

@@ -0,0 +1,67 @@
+package ru.project.sorting;
+
+import ru.project.collection.MyList;
+
+import java.util.Comparator;
+
+public class MergeSortStrategy<T> implements SortStrategy<T> {
+
+    @Override
+    public void sort(MyList<T> list, Comparator<T> comparator) {
+        if (list == null || list.size() <= 1) {
+            return;
+        }
+        mergeSort(list, 0, list.size() - 1, comparator);
+    }
+
+    private void mergeSort(MyList<T> list, int left, int right, Comparator<T> comparator) {
+        if (left >= right) {
+            return;
+        }
+        int mid = (left + right) / 2;
+        mergeSort(list, left, mid, comparator);
+        mergeSort(list, mid + 1, right, comparator);
+        merge(list, left, mid, right, comparator);
+    }
+
+    private void merge(MyList<T> list, int left, int mid, int right, Comparator<T> comparator) {
+        int leftSize = mid - left + 1;
+        int rightSize = right - mid;
+
+        @SuppressWarnings("unchecked")
+        T[] leftArray = (T[]) new Object[leftSize];
+        @SuppressWarnings("unchecked")
+        T[] rightArray = (T[]) new Object[rightSize];
+
+        for (int i = 0; i < leftSize; i++) {
+            leftArray[i] = list.get(left + i);
+        }
+        for (int j = 0; j < rightSize; j++) {
+            rightArray[j] = list.get(mid + 1 + j);
+        }
+
+        int i = 0, j = 0, k = left;
+
+        while (i < leftSize && j < rightSize) {
+            if (comparator.compare(leftArray[i], rightArray[j]) <= 0) {
+                list.set(k, leftArray[i]);
+                i++;
+            } else {
+                list.set(k, rightArray[j]);
+                j++;
+            }
+            k++;
+        }
+
+        while (i < leftSize) {
+            list.set(k, leftArray[i]);
+            i++;
+            k++;
+        }
+        while (j < rightSize) {
+            list.set(k, rightArray[j]);
+            j++;
+            k++;
+        }
+    }
+}

app/src/main/java/ru/project/sorting/SortStrategy.java

@@ -0,0 +1,9 @@
+package ru.project.sorting;
+
+import ru.project.collection.MyList;
+
+import java.util.Comparator;
+
+public interface SortStrategy<T> {
+    void sort(MyList<T> list, Comparator<T> comparator);
+}

app/src/main/java/ru/project/sorting/StudentAverageGradeComparator.java

@@ -0,0 +1,12 @@
+package ru.project.sorting;
+
+import ru.project.student.Student;
+import java.util.Comparator;
+
+public class StudentAverageGradeComparator implements Comparator<Student> {
+
+    @Override
+    public int compare(Student s1, Student s2) {
+        return Double.compare(s1.getAverageGrade(), s2.getAverageGrade());
+    }
+}

app/src/main/java/ru/project/sorting/StudentGroupComparator.java

@@ -0,0 +1,12 @@
+package ru.project.sorting;
+
+import ru.project.student.Student;
+import java.util.Comparator;
+
+public class StudentGroupComparator implements Comparator<Student> {
+
+    @Override
+    public int compare(Student s1, Student s2) {
+        return s1.getGroupNumber().compareTo(s2.getGroupNumber());
+    }
+}

app/src/main/java/ru/project/sorting/StudentRecordBookComparator.java

@@ -0,0 +1,12 @@
+package ru.project.sorting;
+
+import ru.project.student.Student;
+import java.util.Comparator;
+
+public class StudentRecordBookComparator implements Comparator<Student> {
+
+    @Override
+    public int compare(Student s1, Student s2) {
+        return Integer.compare(s1.getRecordBookNumber(), s2.getRecordBookNumber());
+    }
+}

app/src/main/java/ru/project/student/Student.java

@@ -3,21 +3,32 @@ package ru.project.student;
 import java.util.Objects;
 
 public class Student {
+
+  public static final double MIN_AVERAGE_GRADE = 0.0;
+  public static final double MAX_AVERAGE_GRADE = 5.0;
+  public static final int MIN_RECORD_BOOK_NUMBER = 1;
+  public static final String GROUP_NUMBER_PATTERN = "^[A-Z][0-9]{2}$";
+
   private final String groupNumber;
   private final double averageGrade;
   private final int recordBookNumber;
 
   public Student(String groupNumber, double averageGrade, int recordBookNumber) {
-    if (groupNumber == null || !groupNumber.matches("^[A-Z][0-9]{2}$")) {
+    if (groupNumber == null || !groupNumber.matches(GROUP_NUMBER_PATTERN)) {
       throw new IllegalArgumentException(
-          "Group number must match format: one uppercase letter + two digits (e.g. A12)");
+          "Group number must match pattern: " + GROUP_NUMBER_PATTERN);
     }
-    if (averageGrade < 0.0 || averageGrade > 5.0) {
-      throw new IllegalArgumentException("Average grade must be between 0.0 and 5.0");
+    if (averageGrade < MIN_AVERAGE_GRADE || averageGrade > MAX_AVERAGE_GRADE) {
+      throw new IllegalArgumentException(
+          "Average grade must be between " + MIN_AVERAGE_GRADE + " and " + MAX_AVERAGE_GRADE);
     }
     if (recordBookNumber <= 0) {
       throw new IllegalArgumentException("Record book number must be positive");
     }
+    if (recordBookNumber < MIN_RECORD_BOOK_NUMBER) {
+      throw new IllegalArgumentException(
+          "Record book number must be at least " + MIN_RECORD_BOOK_NUMBER);
+    }
     this.groupNumber = groupNumber;
     this.averageGrade = averageGrade;
     this.recordBookNumber = recordBookNumber;
@@ -27,6 +38,10 @@ public class Student {
     return groupNumber;
   }
 
+  public double getAverageGrade() {
+    return averageGrade;
+  }
+
   public int getRecordBookNumber() {
     return recordBookNumber;
   }
@@ -39,11 +54,22 @@ public class Student {
     return new Student(this.groupNumber, averageGrade, this.recordBookNumber);
   }
 
-  public Student withRecordBookNumber(int recordBookNumber) {
-    return new Student(this.groupNumber, this.averageGrade, recordBookNumber);
+  public static double getMinAverageGrade() {
+    return MIN_AVERAGE_GRADE;
+  }
+
+  public static double getMaxAverageGrade() {
+    return MAX_AVERAGE_GRADE;
+  }
+
+  public static int getMinRecordBookNumber() {
+    return MIN_RECORD_BOOK_NUMBER;
+  }
+
+  public static String getGroupNumberPattern() {
+    return GROUP_NUMBER_PATTERN;
   }
 
-  @Override
   public String toString() {
     return "Student{"
         + "groupNumber='"
@@ -56,16 +82,19 @@ public class Student {
         + '}';
   }
 
+  @Override
+  public int hashCode() {
+    return Objects.hash(groupNumber, averageGrade, recordBookNumber);
+  }
+
   @Override
   public boolean equals(Object obj) {
     if (this == obj) {
       return true;
     }
-
     if (obj == null || getClass() != obj.getClass()) {
       return false;
     }
-
     if (this.hashCode() != obj.hashCode()) {
       return false;
     }
@@ -75,25 +104,4 @@ public class Student {
         && recordBookNumber == student.recordBookNumber
         && Objects.equals(groupNumber, student.groupNumber);
   }
-
-  @Override
-  public int hashCode() {
-    return Objects.hash(groupNumber, averageGrade, recordBookNumber);
-  }
-
-  public static double getMinAverageGrade() {
-    return 0.0;
-  }
-
-  public static double getMaxAverageGrade() {
-    return 5.0;
-  }
-
-  public static int getMinRecordBookNumber() {
-    return 1;
-  }
-
-  public static String getGroupNumberPattern() {
-    return "^[A-Z][0-9]{2}$";
-  }
 }