HomeWork 20

hw20.txt

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+Lorem ipsum dolor sit amet, consectetur adipiscing elit.
+Praesent id dolor a lorem tempus tincidunt ut vel orci.
+Nulla tincidunt fringilla turpis, ac eleifend nibh mollis id.
+Aliquam vestibulum laoreet enim sit amet rhoncus.
+Nullam pellentesque convallis velit varius euismod.
+Fusce vulputate nisi vel lectus volutpat porttitor.
+Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos.
+Aenean at porta velit, sed dapibus sapien.
+Morbi ultricies magna quis odio venenatis, sit amet fringilla augue sollicitudin.
+Phasellus dictum et justo ac vestibulum. Aliquam venenatis bibendum libero ac aliquet.
+Curabitur lorem libero, elementum non ultrices a, interdum ut eros.
+Quisque aliquet vestibulum odio id efficitur.
+Donec elementum vel lectus quis accumsan. Aenean in nunc fermentum, vulputate diam id, posuere ex.
+Cras nibh ex, venenatis quis mi a, aliquam maximus ligula.

src/main/java/ru/otus/java/basic/homeworks/ru/otus/java/basic/homeworks/homework20/Application.java

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+package ru.otus.java.basic.homeworks.ru.otus.java.basic.homeworks.homework20;
+
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.util.Scanner;
+
+public class Application {
+    public static void main(String[] args) throws IOException {
+        String[] items;
+        try (Scanner scanner = new Scanner(System.in)) {
+            do {
+                System.out.println("Enter the file name and sequence. For example: text.txt abc");
+                String enterString = scanner.nextLine();
+                items = enterString.trim().split(" ");
+                if (items.length != 2) {
+                    System.out.println("Incorrect input");
+                } else {
+                    break;
+                }
+            } while (true);
+        }
+        int count = countingSequence(items[0], items[1]);
+        if (count != -1) {
+            System.out.println("In the '" + items[0] + "' file, the sequence is repeated " + count + " times");
+        }
+    }
+
+    public static int countingSequence(String fileName, String sequence) {
+        if (sequence.isEmpty()) {
+            return 0;
+        }
+        StringBuilder buffer = new StringBuilder();
+        buffer.append(" ".repeat(sequence.length()));
+        int count = 0;
+
+        try (FileReader fileReader = new FileReader(fileName, StandardCharsets.UTF_8)) {
+            int c;
+            while ((c = fileReader.read()) != -1) {
+                roll(buffer);
+                buffer.append((char) c);
+                if (compareSequence(buffer, sequence)) {
+                    count++;
+                }
+            }
+            return count;
+        } catch (FileNotFoundException e) {
+            System.out.println("The file '" + fileName + "' is not found");
+            return -1;
+        } catch (IOException e) {
+            System.out.println("I/O error");
+            return -1;
+        }
+    }
+
+    private static boolean compareSequence(StringBuilder buffer, String sequence) {
+        return buffer.toString().equals(sequence);
+    }
+
+    private static void roll(StringBuilder buffer) {
+        if (buffer.length() > 1) {
+            buffer.deleteCharAt(0);
+        }
+    }
+}