Java I/O und NIO

<?xml version="1.0" encoding="UTF-8"?>
        <project xmlns="http://maven.apache.org/POM/4.0.0"
                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
            <modelVersion>4.0.0</modelVersion>
            <parent>
                <groupId>at.aydin.academy</groupId>
                <artifactId>17ionio-pair</artifactId>
                <version>1.0.0</version>
                <relativePath>../pom.xml</relativePath>
            </parent>
            <artifactId>nio-modern</artifactId>
            <packaging>jar</packaging>
            <name>NIO Modern</name>

            <dependencies>

<dependency>
    <groupId>org.junit.jupiter</groupId>
    <artifactId>junit-jupiter</artifactId>
    <scope>test</scope>
</dependency>

            </dependencies>
            <build>
                <plugins>
                    <plugin>
                        <groupId>org.apache.maven.plugins</groupId>
                        <artifactId>maven-compiler-plugin</artifactId>
                    </plugin>

                </plugins>
            </build>
        </project>

package at.aydin.lab.io.modern;

import java.io.*;
import java.nio.file.*;
import java.util.*;
import java.util.zip.*;

// Design Pattern: Adapter
// Zweck: Fachliche Dateioperationen werden hinter der modernen Path-/Files-API gebündelt.
public final class PathFileService {
    public long copy(Path source, Path target) throws IOException {
        Files.copy(source, target, StandardCopyOption.REPLACE_EXISTING);
        return Files.size(target);
    }

    public List<Path> find(Path root, String suffix) throws IOException {
        try (var paths = Files.walk(root)) {
            return paths.filter(Files::isRegularFile).filter(p -> p.getFileName().toString().endsWith(suffix)).sorted()
                    .toList();
        }
    }

    public void zip(Path source, Path zip) throws IOException {
        try (ZipOutputStream out = new ZipOutputStream(Files.newOutputStream(zip))) {
            out.putNextEntry(new ZipEntry(source.getFileName().toString()));
            Files.copy(source, out);
            out.closeEntry();
        }
    }
}

package at.aydin.lab.io.modern;

import org.junit.jupiter.api.Test;
import java.nio.file.*;
import static org.junit.jupiter.api.Assertions.*;

class PathFileServiceTest {
    @Test
    void copiesAndFinds() throws Exception {
        Path dir = Files.createTempDirectory("nio"), a = dir.resolve("a.txt"), b = dir.resolve("b.txt");
        Files.writeString(a, "abc");
        var s = new PathFileService();
        assertEquals(3, s.copy(a, b));
        assertEquals(2, s.find(dir, ".txt").size());
    }
}