Move Stored(File|Directory)Helper into NewPipe

app/src/main/java/org/schabi/newpipe/download/DownloadDialog.java

@@ -49,6 +49,8 @@ import org.schabi.newpipe.extractor.stream.StreamInfo;
 import org.schabi.newpipe.extractor.stream.SubtitlesStream;
 import org.schabi.newpipe.extractor.stream.VideoStream;
 import org.schabi.newpipe.settings.NewPipeSettings;
+import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 import org.schabi.newpipe.util.FilenameUtils;
 import org.schabi.newpipe.util.ListHelper;
@@ -68,8 +70,6 @@ import icepick.Icepick;
 import icepick.State;
 import io.reactivex.rxjava3.disposables.CompositeDisposable;
 import us.shandian.giga.get.MissionRecoveryInfo;
-import us.shandian.giga.io.StoredDirectoryHelper;
-import us.shandian.giga.io.StoredFileHelper;
 import us.shandian.giga.postprocessing.Postprocessing;
 import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionFragment.kt

@@ -57,11 +57,11 @@ import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.KEY_MODE
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.KEY_VALUE
 import org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.PREVIOUS_EXPORT_MODE
+import org.schabi.newpipe.streams.io.StoredFileHelper
 import org.schabi.newpipe.util.FilePickerActivityHelper
 import org.schabi.newpipe.util.NavigationHelper
 import org.schabi.newpipe.util.OnClickGesture
 import org.schabi.newpipe.util.ShareUtils
-import us.shandian.giga.io.StoredFileHelper
 import java.text.SimpleDateFormat
 import java.util.Date
 import java.util.Locale

app/src/main/java/org/schabi/newpipe/local/subscription/SubscriptionsImportFragment.java

@@ -34,7 +34,7 @@ import java.util.Collections;
 import java.util.List;
 
 import icepick.State;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 import static org.schabi.newpipe.extractor.subscription.SubscriptionExtractor.ContentSource.CHANNEL_URL;
 import static org.schabi.newpipe.local.subscription.services.SubscriptionsImportService.CHANNEL_URL_MODE;

app/src/main/java/org/schabi/newpipe/local/subscription/services/SubscriptionsExportService.java

@@ -32,6 +32,7 @@ import org.schabi.newpipe.R;
 import org.schabi.newpipe.database.subscription.SubscriptionEntity;
 import org.schabi.newpipe.extractor.subscription.SubscriptionItem;
 import org.schabi.newpipe.streams.io.SharpOutputStream;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 import java.io.IOException;
 import java.io.OutputStream;
@@ -41,7 +42,6 @@ import java.util.List;
 import io.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.schedulers.Schedulers;
-import us.shandian.giga.io.StoredFileHelper;
 
 import static org.schabi.newpipe.MainActivity.DEBUG;
 

app/src/main/java/org/schabi/newpipe/local/subscription/services/SubscriptionsImportService.java

@@ -38,6 +38,7 @@ import org.schabi.newpipe.extractor.channel.ChannelInfo;
 import org.schabi.newpipe.extractor.subscription.SubscriptionItem;
 import org.schabi.newpipe.ktx.ExceptionUtils;
 import org.schabi.newpipe.streams.io.SharpInputStream;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import org.schabi.newpipe.util.Constants;
 import org.schabi.newpipe.util.ExtractorHelper;
 
@@ -52,10 +53,9 @@ import io.reactivex.rxjava3.core.Notification;
 import io.reactivex.rxjava3.functions.Consumer;
 import io.reactivex.rxjava3.functions.Function;
 import io.reactivex.rxjava3.schedulers.Schedulers;
-import us.shandian.giga.io.StoredFileHelper;
 
 import static org.schabi.newpipe.MainActivity.DEBUG;
-import static us.shandian.giga.io.StoredFileHelper.DEFAULT_MIME;
+import static org.schabi.newpipe.streams.io.StoredFileHelper.DEFAULT_MIME;
 
 public class SubscriptionsImportService extends BaseImportExportService {
     public static final int CHANNEL_URL_MODE = 0;

app/src/main/java/org/schabi/newpipe/settings/ContentSettingsFragment.java

@@ -36,8 +36,8 @@ import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Locale;
 
-import us.shandian.giga.io.StoredDirectoryHelper;
+import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 import static org.schabi.newpipe.util.Localization.assureCorrectAppLanguage;
 

app/src/main/java/org/schabi/newpipe/settings/DownloadSettingsFragment.java

@@ -26,7 +26,7 @@ import java.net.URI;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
 
-import us.shandian.giga.io.StoredDirectoryHelper;
+import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
 
 import static org.schabi.newpipe.util.Localization.assureCorrectAppLanguage;
 

app/src/main/java/org/schabi/newpipe/streams/io/StoredDirectoryHelper.java

@@ -1,6 +1,5 @@
-package us.shandian.giga.io;
+package org.schabi.newpipe.streams.io;
 
-import android.annotation.TargetApi;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
@@ -24,10 +23,11 @@ import java.util.Collections;
 
 import static android.provider.DocumentsContract.Document.COLUMN_DISPLAY_NAME;
 import static android.provider.DocumentsContract.Root.COLUMN_DOCUMENT_ID;
-
+import static org.schabi.newpipe.extractor.utils.Utils.isNullOrEmpty;
 
 public class StoredDirectoryHelper {
-    public final static int PERMISSION_FLAGS = Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
+    public static final int PERMISSION_FLAGS = Intent.FLAG_GRANT_READ_URI_PERMISSION
+            | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
 
     private File ioTree;
     private DocumentFile docTree;
@@ -36,7 +36,8 @@ public class StoredDirectoryHelper {
 
     private final String tag;
 
-    public StoredDirectoryHelper(@NonNull Context context, @NonNull Uri path, String tag) throws IOException {
+    public StoredDirectoryHelper(@NonNull final Context context, @NonNull final Uri path,
+                                 final String tag) throws IOException {
         this.tag = tag;
 
         if (ContentResolver.SCHEME_FILE.equalsIgnoreCase(path.getScheme())) {
@@ -48,51 +49,49 @@ public class StoredDirectoryHelper {
 
         try {
             this.context.getContentResolver().takePersistableUriPermission(path, PERMISSION_FLAGS);
-        } catch (Exception e) {
+        } catch (final Exception e) {
             throw new IOException(e);
         }
 
-        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
             throw new IOException("Storage Access Framework with Directory API is not available");
+        }
 
         this.docTree = DocumentFile.fromTreeUri(context, path);
 
-        if (this.docTree == null)
+        if (this.docTree == null) {
             throw new IOException("Failed to create the tree from Uri");
+        }
     }
 
-    @TargetApi(Build.VERSION_CODES.KITKAT)
+    public StoredFileHelper createFile(final String filename, final String mime) {
-    public StoredDirectoryHelper(@NonNull URI location, String tag) {
-        ioTree = new File(location);
-        this.tag = tag;
-    }
-
-    public StoredFileHelper createFile(String filename, String mime) {
         return createFile(filename, mime, false);
     }
 
-    public StoredFileHelper createUniqueFile(String name, String mime) {
+    public StoredFileHelper createUniqueFile(final String name, final String mime) {
-        ArrayList<String> matches = new ArrayList<>();
+        final ArrayList<String> matches = new ArrayList<>();
-        String[] filename = splitFilename(name);
+        final String[] filename = splitFilename(name);
-        String lcFilename = filename[0].toLowerCase();
+        final String lcFilename = filename[0].toLowerCase();
 
         if (docTree == null || Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            for (File file : ioTree.listFiles())
+            for (final File file : ioTree.listFiles()) {
                 addIfStartWith(matches, lcFilename, file.getName());
+            }
         } else {
             // warning: SAF file listing is very slow
-            Uri docTreeChildren = DocumentsContract.buildChildDocumentsUriUsingTree(
+            final Uri docTreeChildren = DocumentsContract.buildChildDocumentsUriUsingTree(
-                    docTree.getUri(), DocumentsContract.getDocumentId(docTree.getUri())
+                    docTree.getUri(), DocumentsContract.getDocumentId(docTree.getUri()));
-            );
 
-            String[] projection = {COLUMN_DISPLAY_NAME};
+            final String[] projection = new String[]{COLUMN_DISPLAY_NAME};
-            String selection = "(LOWER(" + COLUMN_DISPLAY_NAME + ") LIKE ?%";
+            final String selection = "(LOWER(" + COLUMN_DISPLAY_NAME + ") LIKE ?%";
-            ContentResolver cr = context.getContentResolver();
+            final ContentResolver cr = context.getContentResolver();
 
-            try (Cursor cursor = cr.query(docTreeChildren, projection, selection, new String[]{lcFilename}, null)) {
+            try (Cursor cursor = cr.query(docTreeChildren, projection, selection,
+                    new String[]{lcFilename}, null)) {
                 if (cursor != null) {
-                    while (cursor.moveToNext())
+                    while (cursor.moveToNext()) {
                         addIfStartWith(matches, lcFilename, cursor.getString(0));
+                    }
                 }
             }
         }
@@ -102,7 +101,7 @@ public class StoredDirectoryHelper {
         } else {
             // check if the filename is in use
             String lcName = name.toLowerCase();
-            for (String testName : matches) {
+            for (final String testName : matches) {
                 if (testName.equals(lcName)) {
                     lcName = null;
                     break;
@@ -110,28 +109,34 @@ public class StoredDirectoryHelper {
             }
 
             // check if not in use
-            if (lcName != null) return createFile(name, mime, true);
+            if (lcName != null) {
+                return createFile(name, mime, true);
+            }
         }
 
         Collections.sort(matches, String::compareTo);
 
         for (int i = 1; i < 1000; i++) {
-            if (Collections.binarySearch(matches, makeFileName(lcFilename, i, filename[1])) < 0)
+            if (Collections.binarySearch(matches, makeFileName(lcFilename, i, filename[1])) < 0) {
                 return createFile(makeFileName(filename[0], i, filename[1]), mime, true);
+            }
         }
 
-        return createFile(String.valueOf(System.currentTimeMillis()).concat(filename[1]), mime, false);
+        return createFile(String.valueOf(System.currentTimeMillis()).concat(filename[1]), mime,
+                false);
     }
 
-    private StoredFileHelper createFile(String filename, String mime, boolean safe) {
+    private StoredFileHelper createFile(final String filename, final String mime,
-        StoredFileHelper storage;
+                                        final boolean safe) {
+        final StoredFileHelper storage;
 
         try {
-            if (docTree == null)
+            if (docTree == null) {
                 storage = new StoredFileHelper(ioTree, filename, mime);
-            else
+            } else {
                 storage = new StoredFileHelper(context, docTree, filename, mime, safe);
-        } catch (IOException e) {
+            }
+        } catch (final IOException e) {
             return null;
         }
 
@@ -149,7 +154,7 @@ public class StoredDirectoryHelper {
     }
 
     /**
-     * Indicates whatever if is possible access using the {@code java.io} API
+     * Indicates whether it's using the {@code java.io} API.
      *
      * @return {@code true} for Java I/O API, otherwise, {@code false} for Storage Access Framework
      */
@@ -172,7 +177,9 @@ public class StoredDirectoryHelper {
             return ioTree.exists() || ioTree.mkdirs();
         }
 
-        if (docTree.exists()) return true;
+        if (docTree.exists()) {
+            return true;
+        }
 
         try {
             DocumentFile parent;
@@ -180,14 +187,18 @@ public class StoredDirectoryHelper {
 
             while (true) {
                 parent = docTree.getParentFile();
-                if (parent == null || child == null) break;
+                if (parent == null || child == null) {
-                if (parent.exists()) return true;
+                    break;
+                }
+                if (parent.exists()) {
+                    return true;
+                }
 
                 parent.createDirectory(child);
 
-                child = parent.getName();// for the next iteration
+                child = parent.getName(); // for the next iteration
             }
-        } catch (Exception e) {
+        } catch (final Exception ignored) {
             // no more parent directories or unsupported by the storage provider
         }
 
@@ -198,13 +209,13 @@ public class StoredDirectoryHelper {
         return tag;
     }
 
-    public Uri findFile(String filename) {
+    public Uri findFile(final String filename) {
         if (docTree == null) {
-            File res = new File(ioTree, filename);
+            final File res = new File(ioTree, filename);
             return res.exists() ? Uri.fromFile(res) : null;
         }
 
-        DocumentFile res = findFileSAFHelper(context, docTree, filename);
+        final DocumentFile res = findFileSAFHelper(context, docTree, filename);
         return res == null ? null : res.getUri();
     }
 
@@ -218,72 +229,82 @@ public class StoredDirectoryHelper {
         return (docTree == null ? Uri.fromFile(ioTree) : docTree.getUri()).toString();
     }
 
-
     ////////////////////
     //      Utils
     ///////////////////
 
-    private static void addIfStartWith(ArrayList<String> list, @NonNull String base, String str) {
+    private static void addIfStartWith(final ArrayList<String> list, @NonNull final String base,
-        if (str == null || str.isEmpty()) return;
+                                       final String str) {
-        str = str.toLowerCase();
+        if (isNullOrEmpty(str)) {
-        if (str.startsWith(base)) list.add(str);
+            return;
+        }
+        final String lowerStr = str.toLowerCase();
+        if (lowerStr.startsWith(base)) {
+            list.add(lowerStr);
+        }
     }
 
-    private static String[] splitFilename(@NonNull String filename) {
+    private static String[] splitFilename(@NonNull final String filename) {
-        int dotIndex = filename.lastIndexOf('.');
+        final int dotIndex = filename.lastIndexOf('.');
 
-        if (dotIndex < 0 || (dotIndex == filename.length() - 1))
+        if (dotIndex < 0 || (dotIndex == filename.length() - 1)) {
             return new String[]{filename, ""};
+        }
 
         return new String[]{filename.substring(0, dotIndex), filename.substring(dotIndex)};
     }
 
-    private static String makeFileName(String name, int idx, String ext) {
+    private static String makeFileName(final String name, final int idx, final String ext) {
         return name.concat(" (").concat(String.valueOf(idx)).concat(")").concat(ext);
     }
 
     /**
-     * Fast (but not enough) file/directory finder under the storage access framework
+     * Fast (but not enough) file/directory finder under the storage access framework.
      *
      * @param context  The context
      * @param tree     Directory where search
      * @param filename Target filename
      * @return A {@link DocumentFile} contain the reference, otherwise, null
      */
-    static DocumentFile findFileSAFHelper(@Nullable Context context, DocumentFile tree, String filename) {
+    static DocumentFile findFileSAFHelper(@Nullable final Context context, final DocumentFile tree,
+                                          final String filename) {
         if (context == null || Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
-            return tree.findFile(filename);// warning: this is very slow
+            return tree.findFile(filename); // warning: this is very slow
         }
 
-        if (!tree.canRead()) return null;// missing read permission
+        if (!tree.canRead()) {
+            return null; // missing read permission
+        }
 
         final int name = 0;
         final int documentId = 1;
 
         // LOWER() SQL function is not supported
-        String selection = COLUMN_DISPLAY_NAME + " = ?";
+        final String selection = COLUMN_DISPLAY_NAME + " = ?";
-        //String selection = COLUMN_DISPLAY_NAME + " LIKE ?%";
+        //final String selection = COLUMN_DISPLAY_NAME + " LIKE ?%";
 
-        Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(
+        final Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(tree.getUri(),
-                tree.getUri(), DocumentsContract.getDocumentId(tree.getUri())
+                DocumentsContract.getDocumentId(tree.getUri()));
-        );
+        final String[] projection = {COLUMN_DISPLAY_NAME, COLUMN_DOCUMENT_ID};
-        String[] projection = {COLUMN_DISPLAY_NAME, COLUMN_DOCUMENT_ID};
+        final ContentResolver contentResolver = context.getContentResolver();
-        ContentResolver contentResolver = context.getContentResolver();
 
-        filename = filename.toLowerCase();
+        final String lowerFilename = filename.toLowerCase();
 
-        try (Cursor cursor = contentResolver.query(childrenUri, projection, selection, new String[]{filename}, null)) {
+        try (Cursor cursor = contentResolver.query(childrenUri, projection, selection,
-            if (cursor == null) return null;
+                new String[]{lowerFilename}, null)) {
+            if (cursor == null) {
+                return null;
+            }
 
             while (cursor.moveToNext()) {
-                if (cursor.isNull(name) || !cursor.getString(name).toLowerCase().startsWith(filename))
+                if (cursor.isNull(name)
+                        || !cursor.getString(name).toLowerCase().startsWith(lowerFilename)) {
                     continue;
+                }
 
-                return DocumentFile.fromSingleUri(
+                return DocumentFile.fromSingleUri(context,
-                        context, DocumentsContract.buildDocumentUriUsingTree(
+                        DocumentsContract.buildDocumentUriUsingTree(tree.getUri(),
-                                tree.getUri(), cursor.getString(documentId)
+                                cursor.getString(documentId)));
-                        )
-                );
             }
         }
 

app/src/main/java/org/schabi/newpipe/streams/io/StoredFileHelper.java

@@ -1,4 +1,4 @@
-package us.shandian.giga.io;
+package org.schabi.newpipe.streams.io;
 
 import android.annotation.TargetApi;
 import android.content.ContentResolver;
@@ -16,7 +16,6 @@ import androidx.documentfile.provider.DocumentFile;
 import com.nononsenseapps.filepicker.Utils;
 
 import org.schabi.newpipe.settings.NewPipeSettings;
-import org.schabi.newpipe.streams.io.SharpStream;
 import org.schabi.newpipe.util.FilePickerActivityHelper;
 
 import java.io.File;
@@ -24,6 +23,9 @@ import java.io.IOException;
 import java.io.Serializable;
 import java.net.URI;
 
+import us.shandian.giga.io.FileStream;
+import us.shandian.giga.io.FileStreamSAF;
+
 public class StoredFileHelper implements Serializable {
     private static final long serialVersionUID = 0L;
     public static final String DEFAULT_MIME = "application/octet-stream";
@@ -54,27 +56,34 @@ public class StoredFileHelper implements Serializable {
         this.srcType = mime;
     }
 
-    public StoredFileHelper(@Nullable Uri parent, String filename, String mime, String tag) {
+    public StoredFileHelper(@Nullable final Uri parent, final String filename, final String mime,
-        this.source = null;// this instance will be "invalid" see invalidate()/isInvalid() methods
+                            final String tag) {
+        this.source = null; // this instance will be "invalid" see invalidate()/isInvalid() methods
 
         this.srcName = filename;
         this.srcType = mime == null ? DEFAULT_MIME : mime;
-        if (parent != null) this.sourceTree = parent.toString();
+        if (parent != null) {
+            this.sourceTree = parent.toString();
+        }
 
         this.tag = tag;
     }
 
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
-    StoredFileHelper(@Nullable Context context, DocumentFile tree, String filename, String mime, boolean safe) throws IOException {
+    StoredFileHelper(@Nullable final Context context, final DocumentFile tree,
+                     final String filename, final String mime, final boolean safe)
+            throws IOException {
         this.docTree = tree;
         this.context = context;
 
-        DocumentFile res;
+        final DocumentFile res;
 
         if (safe) {
             // no conflicts (the filename is not in use)
             res = this.docTree.createFile(mime, filename);
-            if (res == null) throw new IOException("Cannot create the file");
+            if (res == null) {
+                throw new IOException("Cannot create the file");
+            }
         } else {
             res = createSAF(context, mime, filename);
         }
@@ -88,15 +97,19 @@ public class StoredFileHelper implements Serializable {
         this.srcType = this.docFile.getType();
     }
 
-    StoredFileHelper(File location, String filename, String mime) throws IOException {
+    StoredFileHelper(final File location, final String filename, final String mime)
+            throws IOException {
         this.ioFile = new File(location, filename);
 
         if (this.ioFile.exists()) {
-            if (!this.ioFile.isFile() && !this.ioFile.delete())
+            if (!this.ioFile.isFile() && !this.ioFile.delete()) {
-                throw new IOException("The filename is already in use by non-file entity and cannot overwrite it");
+                throw new IOException("The filename is already in use by non-file entity "
+                        + "and cannot overwrite it");
+            }
         } else {
-            if (!this.ioFile.createNewFile())
+            if (!this.ioFile.createNewFile()) {
                 throw new IOException("Cannot create the file");
+            }
         }
 
         this.source = Uri.fromFile(this.ioFile).toString();
@@ -107,16 +120,20 @@ public class StoredFileHelper implements Serializable {
     }
 
     @TargetApi(Build.VERSION_CODES.KITKAT)
-    public StoredFileHelper(Context context, @Nullable Uri parent, @NonNull Uri path, String tag) throws IOException {
+    public StoredFileHelper(final Context context, @Nullable final Uri parent,
+                            @NonNull final Uri path, final String tag) throws IOException {
         this.tag = tag;
         this.source = path.toString();
 
-        if (path.getScheme() == null || path.getScheme().equalsIgnoreCase(ContentResolver.SCHEME_FILE)) {
+        if (path.getScheme() == null
+                || path.getScheme().equalsIgnoreCase(ContentResolver.SCHEME_FILE)) {
             this.ioFile = new File(URI.create(this.source));
         } else {
-            DocumentFile file = DocumentFile.fromSingleUri(context, path);
+            final DocumentFile file = DocumentFile.fromSingleUri(context, path);
 
-            if (file == null) throw new RuntimeException("SAF not available");
+            if (file == null) {
+                throw new RuntimeException("SAF not available");
+            }
 
             this.context = context;
 
@@ -130,8 +147,9 @@ public class StoredFileHelper implements Serializable {
         }
 
         if (parent != null) {
-            if (!ContentResolver.SCHEME_FILE.equals(parent.getScheme()))
+            if (!ContentResolver.SCHEME_FILE.equals(parent.getScheme())) {
                 this.docTree = DocumentFile.fromTreeUri(context, parent);
+            }
 
             this.sourceTree = parent.toString();
         }
@@ -141,37 +159,45 @@ public class StoredFileHelper implements Serializable {
     }
 
 
-    public static StoredFileHelper deserialize(@NonNull StoredFileHelper storage, Context context) throws IOException {
+    public static StoredFileHelper deserialize(@NonNull final StoredFileHelper storage,
-        Uri treeUri = storage.sourceTree == null ? null : Uri.parse(storage.sourceTree);
+                                               final Context context) throws IOException {
+        final Uri treeUri = storage.sourceTree == null ? null : Uri.parse(storage.sourceTree);
 
-        if (storage.isInvalid())
+        if (storage.isInvalid()) {
             return new StoredFileHelper(treeUri, storage.srcName, storage.srcType, storage.tag);
+        }
 
-        StoredFileHelper instance = new StoredFileHelper(context, treeUri, Uri.parse(storage.source), storage.tag);
+        final StoredFileHelper instance = new StoredFileHelper(context, treeUri,
+                Uri.parse(storage.source), storage.tag);
 
         // under SAF, if the target document is deleted, conserve the filename and mime
-        if (instance.srcName == null) instance.srcName = storage.srcName;
+        if (instance.srcName == null) {
-        if (instance.srcType == null) instance.srcType = storage.srcType;
+            instance.srcName = storage.srcName;
+        }
+        if (instance.srcType == null) {
+            instance.srcType = storage.srcType;
+        }
 
         return instance;
     }
 
     public SharpStream getStream() throws IOException {
-        invalid();
+        assertValid();
 
-        if (docFile == null)
+        if (docFile == null) {
             return new FileStream(ioFile);
-        else
+        } else {
             return new FileStreamSAF(context.getContentResolver(), docFile.getUri());
+        }
     }
 
     /**
-     * Indicates whatever if is possible access using the {@code java.io} API
+     * Indicates whether it's using the {@code java.io} API.
      *
      * @return {@code true} for Java I/O API, otherwise, {@code false} for Storage Access Framework
      */
     public boolean isDirect() {
-        invalid();
+        assertValid();
 
         return docFile == null;
     }
@@ -181,19 +207,19 @@ public class StoredFileHelper implements Serializable {
     }
 
     public Uri getUri() {
-        invalid();
+        assertValid();
 
         return docFile == null ? Uri.fromFile(ioFile) : docFile.getUri();
     }
 
     public Uri getParentUri() {
-        invalid();
+        assertValid();
 
         return sourceTree == null ? null : Uri.parse(sourceTree);
     }
 
     public void truncate() throws IOException {
-        invalid();
+        assertValid();
 
         try (SharpStream fs = getStream()) {
             fs.setLength(0);
@@ -201,16 +227,20 @@ public class StoredFileHelper implements Serializable {
     }
 
     public boolean delete() {
-        if (source == null) return true;
+        if (source == null) {
-        if (docFile == null) return ioFile.delete();
+            return true;
+        }
+        if (docFile == null) {
+            return ioFile.delete();
+        }
 
-
+        final boolean res = docFile.delete();
-        boolean res = docFile.delete();
 
         try {
-            int flags = Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
+            final int flags = Intent.FLAG_GRANT_READ_URI_PERMISSION
+                    | Intent.FLAG_GRANT_WRITE_URI_PERMISSION;
             context.getContentResolver().releasePersistableUriPermission(docFile.getUri(), flags);
-        } catch (Exception ex) {
+        } catch (final Exception ex) {
             // nothing to do
         }
 
@@ -218,31 +248,35 @@ public class StoredFileHelper implements Serializable {
     }
 
     public long length() {
-        invalid();
+        assertValid();
 
         return docFile == null ? ioFile.length() : docFile.length();
     }
 
     public boolean canWrite() {
-        if (source == null) return false;
+        if (source == null) {
+            return false;
+        }
         return docFile == null ? ioFile.canWrite() : docFile.canWrite();
     }
 
     public String getName() {
-        if (source == null)
+        if (source == null) {
             return srcName;
-        else if (docFile == null)
+        } else if (docFile == null) {
             return ioFile.getName();
+        }
 
-        String name = docFile.getName();
+        final String name = docFile.getName();
         return name == null ? srcName : name;
     }
 
     public String getType() {
-        if (source == null || docFile == null)
+        if (source == null || docFile == null) {
             return srcType;
+        }
 
-        String type = docFile.getType();
+        final String type = docFile.getType();
         return type == null ? srcType : type;
     }
 
@@ -251,34 +285,41 @@ public class StoredFileHelper implements Serializable {
     }
 
     public boolean existsAsFile() {
-        if (source == null) return false;
+        if (source == null) {
+            return false;
+        }
 
         // WARNING: DocumentFile.exists() and DocumentFile.isFile() methods are slow
-        boolean exists = docFile == null ? ioFile.exists() : docFile.exists();
+        final boolean exists = docFile == null ? ioFile.exists() : docFile.exists();
-        boolean isFile = docFile == null ? ioFile.isFile() : docFile.isFile();// ¿docFile.isVirtual() means is no-physical?
+        // ¿docFile.isVirtual() means is no-physical?
+        final boolean isFile = docFile == null ? ioFile.isFile() : docFile.isFile();
 
         return exists && isFile;
     }
 
     public boolean create() {
-        invalid();
+        assertValid();
-        boolean result;
+        final boolean result;
 
         if (docFile == null) {
             try {
                 result = ioFile.createNewFile();
-            } catch (IOException e) {
+            } catch (final IOException e) {
                 return false;
             }
         } else if (docTree == null) {
             result = false;
         } else {
-            if (!docTree.canRead() || !docTree.canWrite()) return false;
+            if (!docTree.canRead() || !docTree.canWrite()) {
+                return false;
+            }
             try {
                 docFile = createSAF(context, srcType, srcName);
-                if (docFile.getName() == null) return false;
+                if (docFile.getName() == null) {
+                    return false;
+                }
                 result = true;
-            } catch (IOException e) {
+            } catch (final IOException e) {
                 return false;
             }
         }
@@ -293,7 +334,9 @@ public class StoredFileHelper implements Serializable {
     }
 
     public void invalidate() {
-        if (source == null) return;
+        if (source == null) {
+            return;
+        }
 
         srcName = getName();
         srcType = getType();
@@ -306,81 +349,102 @@ public class StoredFileHelper implements Serializable {
         context = null;
     }
 
-    public boolean equals(StoredFileHelper storage) {
+    public boolean equals(final StoredFileHelper storage) {
-        if (this == storage) return true;
+        if (this == storage) {
+            return true;
+        }
 
         // note: do not compare tags, files can have the same parent folder
         //if (stringMismatch(this.tag, storage.tag)) return false;
 
-        if (stringMismatch(getLowerCase(this.sourceTree), getLowerCase(this.sourceTree)))
+        if (stringMismatch(getLowerCase(this.sourceTree), getLowerCase(this.sourceTree))) {
             return false;
-
-        if (this.isInvalid() || storage.isInvalid()) {
-            if (this.srcName == null || storage.srcName == null || this.srcType == null || storage.srcType == null) return false;
-            return this.srcName.equalsIgnoreCase(storage.srcName) && this.srcType.equalsIgnoreCase(storage.srcType);
         }
 
-        if (this.isDirect() != storage.isDirect()) return false;
+        if (this.isInvalid() || storage.isInvalid()) {
+            if (this.srcName == null || storage.srcName == null || this.srcType == null
+                    || storage.srcType == null) {
+                return false;
+            }
 
-        if (this.isDirect())
+            return this.srcName.equalsIgnoreCase(storage.srcName)
+                    && this.srcType.equalsIgnoreCase(storage.srcType);
+        }
+
+        if (this.isDirect() != storage.isDirect()) {
+            return false;
+        }
+
+        if (this.isDirect()) {
             return this.ioFile.getPath().equalsIgnoreCase(storage.ioFile.getPath());
+        }
 
-        return DocumentsContract.getDocumentId(
+        return DocumentsContract.getDocumentId(this.docFile.getUri())
-                this.docFile.getUri()
+                .equalsIgnoreCase(DocumentsContract.getDocumentId(storage.docFile.getUri()));
-        ).equalsIgnoreCase(DocumentsContract.getDocumentId(
-                storage.docFile.getUri()
-        ));
     }
 
     @NonNull
     @Override
     public String toString() {
-        if (source == null)
+        if (source == null) {
             return "[Invalid state] name=" + srcName + "  type=" + srcType + "  tag=" + tag;
-        else
+        } else {
-            return "sourceFile=" + source + "  treeSource=" + (sourceTree == null ? "" : sourceTree) + "  tag=" + tag;
+            return "sourceFile=" + source + "  treeSource=" + (sourceTree == null ? "" : sourceTree)
+                    + "  tag=" + tag;
+        }
     }
 
 
-    private void invalid() {
+    private void assertValid() {
-        if (source == null)
+        if (source == null) {
             throw new IllegalStateException("In invalid state");
+        }
     }
 
     private void takePermissionSAF() throws IOException {
         try {
-            context.getContentResolver().takePersistableUriPermission(docFile.getUri(), StoredDirectoryHelper.PERMISSION_FLAGS);
+            context.getContentResolver().takePersistableUriPermission(docFile.getUri(),
-        } catch (Exception e) {
+                    StoredDirectoryHelper.PERMISSION_FLAGS);
-            if (docFile.getName() == null) throw new IOException(e);
+        } catch (final Exception e) {
+            if (docFile.getName() == null) {
+                throw new IOException(e);
+            }
         }
     }
 
     @NonNull
-    private DocumentFile createSAF(@Nullable Context context, String mime, String filename)
+    private DocumentFile createSAF(@Nullable final Context ctx, final String mime,
-            throws IOException {
+                                   final String filename) throws IOException {
-        DocumentFile res = StoredDirectoryHelper.findFileSAFHelper(context, docTree, filename);
+        DocumentFile res = StoredDirectoryHelper.findFileSAFHelper(ctx, docTree, filename);
 
         if (res != null && res.exists() && res.isDirectory()) {
-            if (!res.delete())
+            if (!res.delete()) {
                 throw new IOException("Directory with the same name found but cannot delete");
+            }
             res = null;
         }
 
         if (res == null) {
             res = this.docTree.createFile(srcType == null ? DEFAULT_MIME : mime, filename);
-            if (res == null) throw new IOException("Cannot create the file");
+            if (res == null) {
+                throw new IOException("Cannot create the file");
+            }
         }
 
         return res;
     }
 
-    private String getLowerCase(String str) {
+    private String getLowerCase(final String str) {
         return str == null ? null : str.toLowerCase();
     }
 
-    private boolean stringMismatch(String str1, String str2) {
+    private boolean stringMismatch(final String str1, final String str2) {
-        if (str1 == null && str2 == null) return false;
+        if (str1 == null && str2 == null) {
-        if ((str1 == null) != (str2 == null)) return true;
+            return false;
+        }
+        if ((str1 == null) != (str2 == null)) {
+            return true;
+        }
 
         return !str1.equals(str2);
     }

app/src/main/java/org/schabi/newpipe/util/ZipHelper.java

@@ -11,7 +11,7 @@ import java.util.zip.ZipEntry;
 import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 /**
  * Created by Christian Schabesberger on 28.01.18.

app/src/main/java/us/shandian/giga/get/DownloadMission.java

@@ -26,7 +26,7 @@ import java.util.Objects;
 
 import javax.net.ssl.SSLException;
 
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import us.shandian.giga.postprocessing.Postprocessing;
 import us.shandian.giga.service.DownloadManagerService;
 import us.shandian.giga.util.Utility;

app/src/main/java/us/shandian/giga/get/Mission.java

@@ -5,7 +5,7 @@ import androidx.annotation.NonNull;
 import java.io.Serializable;
 import java.util.Calendar;
 
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 public abstract class Mission implements Serializable {
     private static final long serialVersionUID = 1L;// last bump: 27 march 2019
@@ -25,6 +25,10 @@ public abstract class Mission implements Serializable {
      */
     public long timestamp;
 
+    public long getTimestamp() {
+        return timestamp;
+    }
+
     /**
      * pre-defined content type
      */
@@ -35,10 +39,6 @@ public abstract class Mission implements Serializable {
      */
     public StoredFileHelper storage;
 
-    public long getTimestamp() {
-        return timestamp;
-    }
-
     /**
      * Delete the downloaded file
      *
@@ -57,7 +57,7 @@ public abstract class Mission implements Serializable {
     @NonNull
     @Override
     public String toString() {
-        Calendar calendar = Calendar.getInstance();
+        final Calendar calendar = Calendar.getInstance();
         calendar.setTimeInMillis(timestamp);
         return "[" + calendar.getTime().toString() + "] " + (storage.isInvalid() ? storage.getName() : storage.getUri());
     }

app/src/main/java/us/shandian/giga/get/sqlite/FinishedMissionStore.java

@@ -17,7 +17,7 @@ import java.util.Objects;
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
 import us.shandian.giga.get.Mission;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 /**
  * SQLite helper to store finished {@link us.shandian.giga.get.FinishedMission}'s

app/src/main/java/us/shandian/giga/service/DownloadManager.java

@@ -19,8 +19,8 @@ import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
 import us.shandian.giga.get.Mission;
 import us.shandian.giga.get.sqlite.FinishedMissionStore;
-import us.shandian.giga.io.StoredDirectoryHelper;
+import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import us.shandian.giga.util.Utility;
 
 import static org.schabi.newpipe.BuildConfig.DEBUG;

app/src/main/java/us/shandian/giga/service/DownloadManagerService.java

@@ -47,8 +47,8 @@ import java.util.ArrayList;
 
 import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.MissionRecoveryInfo;
-import us.shandian.giga.io.StoredDirectoryHelper;
+import org.schabi.newpipe.streams.io.StoredDirectoryHelper;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import us.shandian.giga.postprocessing.Postprocessing;
 import us.shandian.giga.service.DownloadManager.NetworkState;
 

app/src/main/java/us/shandian/giga/ui/adapter/MissionAdapter.java

@@ -61,7 +61,7 @@ import us.shandian.giga.get.DownloadMission;
 import us.shandian.giga.get.FinishedMission;
 import us.shandian.giga.get.Mission;
 import us.shandian.giga.get.MissionRecoveryInfo;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;
 import us.shandian.giga.ui.common.Deleter;

app/src/main/java/us/shandian/giga/ui/fragment/MissionsFragment.java

@@ -36,7 +36,7 @@ import java.io.File;
 import java.io.IOException;
 
 import us.shandian.giga.get.DownloadMission;
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 import us.shandian.giga.service.DownloadManager;
 import us.shandian.giga.service.DownloadManagerService;
 import us.shandian.giga.service.DownloadManagerService.DownloadManagerBinder;

app/src/main/java/us/shandian/giga/util/Utility.java

@@ -29,7 +29,7 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.util.Locale;
 
-import us.shandian.giga.io.StoredFileHelper;
+import org.schabi.newpipe.streams.io.StoredFileHelper;
 
 public class Utility {