FileSystem and Screen lib realization [try 2]

filesystem/pom.xml

@@ -1,6 +1,6 @@
 <?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"
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
         <artifactId>arcadexsystem</artifactId>

filesystem/src/main/java/FileSystemLib.java

@@ -0,0 +1,145 @@
+import java.io.*;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
+
+/**
+ * File System proxy lib
+ * <p>
+ * Created by daniil on 02.04.16.
+ */
+public class FileSystemLib {
+    /**
+     * Copy data from InputStream to OutputStream
+     *
+     * @param from Input Stream
+     * @param to   Output Stream
+     * @return size of copied data
+     * @throws IOException
+     */
+    protected static long copy(InputStream from, OutputStream to) throws IOException {
+        assert from != null;
+        assert to != null;
+        byte[] buf = new byte[4096];
+        long total = 0L;
+
+        while (true) {
+            int r = from.read(buf);
+            if (r == -1) {
+                return total;
+            }
+
+            to.write(buf, 0, r);
+            total += (long) r;
+        }
+    }
+
+    /**
+     * Copy file or directory from one direction to another
+     *
+     * @param from    File to copy
+     * @param to      Destination
+     * @param replace replace the destination file if present?
+     * @throws IOException
+     */
+    public void copy(Path from, Path to, boolean replace) throws IOException {
+        assert from != null;
+        assert to != null;
+
+        if (!replace)
+            Files.copy(from, to);
+        else
+            Files.copy(from, to, StandardCopyOption.REPLACE_EXISTING);
+    }
+
+    /**
+     * Delete file
+     *
+     * @param file file to delete
+     * @throws IOException, FileNotFoundException
+     */
+    public void delete(File file) throws IOException {
+        assert file != null;
+
+        if (!file.exists())
+            throw new FileNotFoundException("Unable to delete nonexistent file");
+        if (!file.delete())
+            throw new IOException("Unable to delete this file");
+    }
+
+    /**
+     * Create a symlink
+     *
+     * @param linkFile   Where symlink should be created
+     * @param actualFile Where should it point to
+     * @throws IOException
+     */
+    public void createSymlink(Path linkFile, Path actualFile) throws IOException {
+        assert linkFile != null;
+        assert actualFile != null;
+
+        if (!actualFile.toFile().exists())
+            throw new FileNotFoundException("Couldn't find symlink destination");
+
+        Files.createSymbolicLink(linkFile, actualFile);
+    }
+
+    public void restoreFromResources(String resourceName, File destination, boolean replace) throws IOException {
+        assert resourceName != null;
+        assert destination != null;
+
+        if (destination.exists() && !replace)
+            return;
+        try {
+            if (!destination.createNewFile())
+                throw new IOException("Unable to create new file");
+
+            try (InputStream is = this.getClass().getClassLoader().getResourceAsStream(resourceName);
+                 OutputStream os = new FileOutputStream(destination)) {
+                copy(is, os);
+            }
+        } catch (IOException e) {
+            throw new IOException("Unable to restore file from resource");
+        }
+    }
+
+    /**
+     * Get FileReader for the file
+     * <p>
+     * We need this to make the code testable
+     *
+     * @param file file to read
+     * @return FileReader
+     * @throws FileNotFoundException
+     */
+    public Reader getReader(File file) throws FileNotFoundException {
+        assert file != null;
+
+        return new FileReader(file);
+    }
+
+    /**
+     * Get FileWriter for the file
+     * <p>
+     * We need this to make the code testable
+     *
+     * @param file file to write to
+     * @return FileWriter
+     * @throws IOException
+     */
+    public Writer getWriter(File file) throws IOException {
+        return new FileWriter(file);
+    }
+
+    /**
+     * Unzip archive to directory
+     *
+     * @param archive   archive to extract
+     * @param directory destination
+     * @throws IOException
+     */
+    public void unzip(String archive, String directory) throws IOException {
+        UnzipUtility zip = new UnzipUtility();
+        zip.unzip(archive, directory);
+    }
+}