Refactor ModListPage and InstallerListPage

HMCLCore/src/main/java/org/jackhuang/hmcl/game/World.java

@@ -0,0 +1,61 @@
+package org.jackhuang.hmcl.game;
+
+import org.jackhuang.hmcl.util.CompressingUtils;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.Unzipper;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class World {
+
+    private final Path file;
+    private final String name;
+
+    public World(Path file) throws IOException {
+        this.file = file;
+
+        if (Files.isDirectory(file))
+            name = loadFromDirectory();
+        else if (Files.isRegularFile(file))
+            name = loadFromZip();
+        else
+            throw new IOException("Path " + file + " cannot be recognized as a Minecraft world");
+    }
+
+    private String loadFromDirectory() {
+        return FileUtils.getName(file);
+    }
+
+    private String loadFromZip() throws IOException {
+        try (FileSystem fs = CompressingUtils.createReadOnlyZipFileSystem(file)) {
+            Path root = Files.list(fs.getPath("/")).filter(Files::isDirectory).findAny()
+                    .orElseThrow(() -> new IOException("Not a valid world zip file"));
+
+            Path levelDat = root.resolve("level.dat");
+            if (!Files.exists(levelDat))
+                throw new FileNotFoundException("Not a valid world zip file since level.dat cannot be found.");
+
+            return FileUtils.getName(root);
+        }
+    }
+
+    public void install(Path savesDir) throws IOException {
+        Path worldDir = savesDir.resolve(name);
+        if (Files.isDirectory(worldDir)) {
+            throw new FileAlreadyExistsException("World already exists");
+        }
+
+        if (Files.isRegularFile(file)) {
+            new Unzipper(file, savesDir)
+                    .setSubDirectory("/" + name + "/")
+                    .unzip();
+        } else if (Files.isDirectory(file)) {
+            FileUtils.copyDirectory(file, worldDir);
+        }
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/util/FileUtils.java

@@ -22,8 +22,8 @@ import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.lang.reflect.Method;
 import java.nio.charset.Charset;
-import java.nio.file.Files;
-import java.nio.file.StandardCopyOption;
+import java.nio.file.*;
+import java.nio.file.attribute.BasicFileAttributes;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Objects;
@@ -54,6 +54,10 @@ public final class FileUtils {
         return StringUtils.addPrefix(StringUtils.removeSuffix(path, "/", "\\"), "/");
     }
 
+    public static String getName(Path path) {
+        return StringUtils.removeSuffix(path.getFileName().toString(), "/", "\\");
+    }
+
     public static String readText(File file) throws IOException {
         return readText(file, UTF_8);
     }
@@ -97,6 +101,26 @@ public final class FileUtils {
         return Lang.test(() -> deleteDirectory(directory));
     }
 
+    public static void copyDirectory(Path src, Path dest) throws IOException {
+        Files.walkFileTree(src, new SimpleFileVisitor<Path>(){
+            @Override
+            public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException {
+                Path destFile = dest.resolve(src.relativize(file));
+                Files.copy(file, destFile);
+
+                return FileVisitResult.CONTINUE;
+            }
+
+            @Override
+            public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
+                Path destDir = dest.resolve(src.relativize(dir));
+                Files.createDirectory(destDir);
+
+                return FileVisitResult.CONTINUE;
+            }
+        });
+    }
+
     public static boolean moveToTrash(File file) {
         try {
             java.awt.Desktop desktop = java.awt.Desktop.getDesktop();