dev.dworks.apps.anexplorer.provider.ExternalStorageProvider.java Source code

Java tutorial

Introduction

Here is the source code for dev.dworks.apps.anexplorer.provider.ExternalStorageProvider.java

Source

/*
 * Copyright (C) 2014 Hari Krishna Dulipudi
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package dev.dworks.apps.anexplorer.provider;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.ContentProviderClient;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.graphics.Point;
import android.net.Uri;
import android.os.Binder;
import android.os.Build;
import android.os.Environment;
import android.os.FileObserver;
import android.os.Handler;
import android.os.ParcelFileDescriptor;
import android.support.v4.os.EnvironmentCompat;
import android.text.TextUtils;
import android.util.Log;

import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

import dev.dworks.apps.anexplorer.BuildConfig;
import dev.dworks.apps.anexplorer.R;
import dev.dworks.apps.anexplorer.cursor.MatrixCursor;
import dev.dworks.apps.anexplorer.cursor.MatrixCursor.RowBuilder;
import dev.dworks.apps.anexplorer.libcore.io.IoUtils;
import dev.dworks.apps.anexplorer.misc.CancellationSignal;
import dev.dworks.apps.anexplorer.misc.ContentProviderClientCompat;
import dev.dworks.apps.anexplorer.misc.FileUtils;
import dev.dworks.apps.anexplorer.misc.MimePredicate;
import dev.dworks.apps.anexplorer.misc.MimeTypes;
import dev.dworks.apps.anexplorer.misc.StorageUtils;
import dev.dworks.apps.anexplorer.misc.StorageVolume;
import dev.dworks.apps.anexplorer.misc.Utils;
import dev.dworks.apps.anexplorer.model.DocumentsContract;
import dev.dworks.apps.anexplorer.model.DocumentsContract.Document;
import dev.dworks.apps.anexplorer.model.DocumentsContract.Root;
import dev.dworks.apps.anexplorer.model.GuardedBy;
import dev.dworks.apps.anexplorer.setting.SettingsActivity;

import static dev.dworks.apps.anexplorer.model.DocumentInfo.getCursorString;

@SuppressLint("DefaultLocale")
public class ExternalStorageProvider extends StorageProvider {
    private static final String TAG = "ExternalStorage";

    private static final boolean LOG_INOTIFY = false;

    public static final String AUTHORITY = BuildConfig.APPLICATION_ID + ".externalstorage.documents";
    public static final String DOWNLOAD_AUTHORITY = "com.android.providers.downloads.documents";
    // docId format: root:path/to/file

    private static final String[] DEFAULT_ROOT_PROJECTION = new String[] { Root.COLUMN_ROOT_ID, Root.COLUMN_FLAGS,
            Root.COLUMN_ICON, Root.COLUMN_TITLE, Root.COLUMN_DOCUMENT_ID, Root.COLUMN_AVAILABLE_BYTES,
            Root.COLUMN_TOTAL_BYTES, Root.COLUMN_PATH, };

    private static final String[] DEFAULT_DOCUMENT_PROJECTION = new String[] { Document.COLUMN_DOCUMENT_ID,
            Document.COLUMN_MIME_TYPE, Document.COLUMN_PATH, Document.COLUMN_DISPLAY_NAME,
            Document.COLUMN_LAST_MODIFIED, Document.COLUMN_FLAGS, Document.COLUMN_SIZE, Document.COLUMN_SUMMARY, };
    private boolean showFilesHidden;

    private static class RootInfo {
        public String rootId;
        public int flags;
        public String title;
        public String docId;
        public String path;
    }

    public static final String ROOT_ID_PRIMARY_EMULATED = "primary";
    public static final String ROOT_ID_SECONDARY = "secondary";
    public static final String ROOT_ID_PHONE = "phone";
    public static final String ROOT_ID_DOWNLOAD = "download";
    public static final String ROOT_ID_BLUETOOTH = "bluetooth";
    public static final String ROOT_ID_APP_BACKUP = "app_backup";
    public static final String ROOT_ID_HIDDEN = "hidden";
    public static final String ROOT_ID_BOOKMARK = "bookmark";

    private static final String DIR_ROOT = "/";

    private Handler mHandler;

    private final Object mRootsLock = new Object();

    @GuardedBy("mRootsLock")
    private ArrayList<RootInfo> mRoots;
    @GuardedBy("mRootsLock")
    private HashMap<String, RootInfo> mIdToRoot;
    @GuardedBy("mRootsLock")
    private HashMap<String, File> mIdToPath;

    @GuardedBy("mObservers")
    private Map<File, DirectoryObserver> mObservers = Maps.newHashMap();

    @Override
    public boolean onCreate() {
        mHandler = new Handler();

        mRoots = Lists.newArrayList();
        mIdToRoot = Maps.newLinkedHashMap();
        mIdToPath = Maps.newLinkedHashMap();

        updateVolumes();
        updateSettings();

        return true;
    }

    public void updateVolumes() {
        synchronized (mRootsLock) {
            updateVolumesLocked();
            includeOtherRoot();
            includeBookmarkRoot();
        }
    }

    @TargetApi(Build.VERSION_CODES.KITKAT)
    private void updateVolumesLocked() {
        mRoots.clear();
        mIdToPath.clear();
        mIdToRoot.clear();

        int count = 0;
        StorageUtils storageUtils = new StorageUtils(getContext());
        for (StorageVolume volume : storageUtils.getStorageMounts()) {
            final File path = volume.getPathFile();
            String state = EnvironmentCompat.getStorageState(path);
            final boolean mounted = Environment.MEDIA_MOUNTED.equals(state)
                    || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state);
            if (!mounted)
                continue;

            final String rootId;
            final String title;
            if (volume.isPrimary && volume.isEmulated) {
                rootId = ROOT_ID_PRIMARY_EMULATED;
                title = getContext().getString(R.string.root_internal_storage);
            } else if (volume.getUuid() != null) {
                rootId = ROOT_ID_SECONDARY + volume.getLabel();
                String label = volume.getLabel();
                title = !TextUtils.isEmpty(label) ? label
                        : getContext().getString(R.string.root_external_storage) + (count > 0 ? " " + count : "");
                count++;
            } else {
                Log.d(TAG, "Missing UUID for " + volume.getPath() + "; skipping");
                continue;
            }

            if (mIdToPath.containsKey(rootId)) {
                Log.w(TAG, "Duplicate UUID " + rootId + "; skipping");
                continue;
            }

            try {
                if (null == path.listFiles()) {
                    continue;
                }
                mIdToPath.put(rootId, path);
                final RootInfo root = new RootInfo();

                root.rootId = rootId;
                root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY
                        | Root.FLAG_ADVANCED | Root.FLAG_SUPPORTS_SEARCH | Root.FLAG_SUPPORTS_IS_CHILD;
                root.title = title;
                root.docId = getDocIdForFile(path);
                root.path = path.getPath();
                mRoots.add(root);
                mIdToRoot.put(rootId, root);
            } catch (FileNotFoundException e) {
                throw new IllegalStateException(e);
            }
        }

        Log.d(TAG, "After updating volumes, found " + mRoots.size() + " active roots");

        getContext().getContentResolver().notifyChange(DocumentsContract.buildRootsUri(AUTHORITY), null, false);
    }

    private void includeOtherRoot() {
        try {
            final String rootId = ROOT_ID_PHONE;
            final File path = new File(DIR_ROOT);
            mIdToPath.put(rootId, path);

            final RootInfo root = new RootInfo();
            root.rootId = rootId;
            root.flags = Root.FLAG_LOCAL_ONLY | Root.FLAG_ADVANCED | Root.FLAG_SUPER_ADVANCED
                    | Root.FLAG_SUPPORTS_SEARCH;
            root.title = getContext().getString(R.string.root_phone_storage);
            root.docId = getDocIdForFile(path);
            root.path = path.getPath();
            mRoots.add(root);
            mIdToRoot.put(rootId, root);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            final String rootId = ROOT_ID_DOWNLOAD;
            final File path = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
            mIdToPath.put(rootId, path);

            final RootInfo root = new RootInfo();
            root.rootId = rootId;
            root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY
                    | Root.FLAG_ADVANCED | Root.FLAG_SUPPORTS_SEARCH;
            root.title = getContext().getString(R.string.root_downloads);
            root.docId = getDocIdForFile(path);
            root.path = path.getPath();
            mRoots.add(root);
            mIdToRoot.put(rootId, root);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            final String rootId = ROOT_ID_APP_BACKUP;
            final File path = Environment.getExternalStoragePublicDirectory("AppBackup");
            mIdToPath.put(rootId, path);

            final RootInfo root = new RootInfo();
            root.rootId = rootId;
            root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY
                    | Root.FLAG_ADVANCED | Root.FLAG_SUPPORTS_SEARCH;
            root.title = getContext().getString(R.string.root_app_backup);
            root.docId = getDocIdForFile(path);
            root.path = path.getPath();
            mRoots.add(root);
            mIdToRoot.put(rootId, root);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }

        try {
            final String rootId = ROOT_ID_BLUETOOTH;
            File path = Environment.getExternalStoragePublicDirectory("Bluetooth");
            if (null == path) {
                path = Environment.getExternalStoragePublicDirectory("Download/Bluetooth");
            }
            if (null != path) {
                mIdToPath.put(rootId, path);

                final RootInfo root = new RootInfo();
                root.rootId = rootId;
                root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY
                        | Root.FLAG_ADVANCED | Root.FLAG_SUPPORTS_SEARCH;
                root.title = getContext().getString(R.string.root_bluetooth);
                root.docId = getDocIdForFile(path);
                root.path = path.getPath();
                mRoots.add(root);
                mIdToRoot.put(rootId, root);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    private void includeBookmarkRoot() {
        Cursor cursor = null;
        try {
            cursor = getContext().getContentResolver().query(ExplorerProvider.buildBookmark(), null, null, null,
                    null);
            while (cursor.moveToNext()) {
                try {
                    final String rootId = ROOT_ID_BOOKMARK + " "
                            + getCursorString(cursor, ExplorerProvider.BookmarkColumns.ROOT_ID);
                    final File path = new File(getCursorString(cursor, ExplorerProvider.BookmarkColumns.PATH));
                    mIdToPath.put(rootId, path);

                    final RootInfo root = new RootInfo();
                    root.rootId = rootId;
                    root.flags = Root.FLAG_SUPPORTS_CREATE | Root.FLAG_SUPPORTS_EDIT | Root.FLAG_LOCAL_ONLY
                            | Root.FLAG_ADVANCED | Root.FLAG_SUPPORTS_SEARCH;
                    root.title = getCursorString(cursor, ExplorerProvider.BookmarkColumns.TITLE);
                    root.docId = getDocIdForFile(path);
                    root.path = path.getPath();
                    mRoots.add(root);
                    mIdToRoot.put(rootId, root);
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        } catch (Exception e) {
            Log.w(TAG, "Failed to load some roots from " + ExplorerProvider.AUTHORITY + ": " + e);
        } finally {
            IoUtils.closeQuietly(cursor);
        }
    }

    public void updateSettings() {
        showFilesHidden = SettingsActivity.getDisplayFileHidden(getContext());
    }

    private static String[] resolveRootProjection(String[] projection) {
        return projection != null ? projection : DEFAULT_ROOT_PROJECTION;
    }

    private static String[] resolveDocumentProjection(String[] projection) {
        return projection != null ? projection : DEFAULT_DOCUMENT_PROJECTION;
    }

    public static void notifyRootsChanged(Context context) {
        context.getContentResolver().notifyChange(DocumentsContract.buildRootsUri(AUTHORITY), null, false);
    }

    public static void updateVolumes(Context context) {
        final ContentProviderClient client = ContentProviderClientCompat.acquireUnstableContentProviderClient(
                context.getContentResolver(), ExternalStorageProvider.AUTHORITY);
        try {
            ((ExternalStorageProvider) client.getLocalContentProvider()).updateVolumes();
        } finally {
            ContentProviderClientCompat.releaseQuietly(client);
        }
    }

    public static boolean isDownloadAuthority(Intent intent) {
        if (null != intent.getData()) {
            String authority = intent.getData().getAuthority();
            return ExternalStorageProvider.DOWNLOAD_AUTHORITY.equals(authority);
        }
        return false;
    }

    private String getDocIdForFile(File file) throws FileNotFoundException {
        String path = file.getAbsolutePath();

        // Find the most-specific root path
        Map.Entry<String, File> mostSpecific = null;
        synchronized (mRootsLock) {
            for (Map.Entry<String, File> root : mIdToPath.entrySet()) {
                final String rootPath = root.getValue().getPath();
                if (path.startsWith(rootPath) && (mostSpecific == null
                        || rootPath.length() > mostSpecific.getValue().getPath().length())) {
                    mostSpecific = root;
                }
            }
        }

        if (mostSpecific == null) {
            throw new FileNotFoundException("Failed to find root that contains " + path);
        }

        // Start at first char of path under root
        final String rootPath = mostSpecific.getValue().getPath();
        if (rootPath.equals(path)) {
            path = "";
        } else if (rootPath.endsWith("/")) {
            path = path.substring(rootPath.length());
        } else {
            path = path.substring(rootPath.length() + 1);
        }

        return mostSpecific.getKey() + ':' + path;
    }

    private File getFileForDocId(String docId) throws FileNotFoundException {
        final int splitIndex = docId.indexOf(':', 1);
        final String tag = docId.substring(0, splitIndex);
        final String path = docId.substring(splitIndex + 1);

        File target;
        synchronized (mRootsLock) {
            target = mIdToPath.get(tag);
        }
        if (target == null) {
            throw new FileNotFoundException("No root for " + tag);
        }
        if (!target.exists()) {
            target.mkdirs();
        }
        target = new File(target, path);
        if (!target.exists()) {
            throw new FileNotFoundException("Missing file for " + docId + " at " + target);
        }
        return target;
    }

    private void includeFile(MatrixCursor result, String docId, File file) throws FileNotFoundException {
        if (docId == null) {
            docId = getDocIdForFile(file);
        } else {
            file = getFileForDocId(docId);
        }

        int flags = 0;

        if (file.canWrite()) {
            if (file.isDirectory()) {
                flags |= Document.FLAG_DIR_SUPPORTS_CREATE;
                flags |= Document.FLAG_SUPPORTS_DELETE;
                flags |= Document.FLAG_SUPPORTS_RENAME;
            } else {
                flags |= Document.FLAG_SUPPORTS_WRITE;
                flags |= Document.FLAG_SUPPORTS_DELETE;
                flags |= Document.FLAG_SUPPORTS_RENAME;
            }
            flags |= Document.FLAG_SUPPORTS_DELETE | Document.FLAG_SUPPORTS_EDIT;
        }

        final String displayName = file.getName();
        if (!showFilesHidden && !TextUtils.isEmpty(displayName)) {
            if (displayName.charAt(0) == '.') {
                return;
            }
        }
        final String mimeType = getTypeForFile(file);
        if (MimePredicate.mimeMatches(MimePredicate.VISUAL_MIMES, mimeType)) {
            flags |= Document.FLAG_SUPPORTS_THUMBNAIL;
        }

        final RowBuilder row = result.newRow();
        row.add(Document.COLUMN_DOCUMENT_ID, docId);
        row.add(Document.COLUMN_DISPLAY_NAME, displayName);
        row.add(Document.COLUMN_SIZE, file.length());
        row.add(Document.COLUMN_MIME_TYPE, mimeType);
        row.add(Document.COLUMN_PATH, file.getAbsolutePath());
        row.add(Document.COLUMN_FLAGS, flags);
        if (file.isDirectory() && null != file.list()) {
            row.add(Document.COLUMN_SUMMARY, FileUtils.formatFileCount(file.list().length));
        }

        // Only publish dates reasonably after epoch
        long lastModified = file.lastModified();
        if (lastModified > 31536000000L) {
            row.add(Document.COLUMN_LAST_MODIFIED, lastModified);
        }
    }

    private void includeZIPFile(MatrixCursor result, String docId, ZipEntry zipEntry) throws FileNotFoundException {

        int flags = 0;

        final String displayName = zipEntry.getName();
        final String mimeType = ""; //getTypeForFile(zipEntry);

        final RowBuilder row = result.newRow();
        row.add(Document.COLUMN_DOCUMENT_ID, docId);
        row.add(Document.COLUMN_DISPLAY_NAME, displayName);
        row.add(Document.COLUMN_SIZE, zipEntry.getSize());
        row.add(Document.COLUMN_MIME_TYPE, mimeType);
        row.add(Document.COLUMN_PATH, "");//zipEntry.getAbsolutePath());
        row.add(Document.COLUMN_FLAGS, flags);
        if (zipEntry.isDirectory()) {
            row.add(Document.COLUMN_SUMMARY, "? files");
        }

        // Only publish dates reasonably after epoch
        long lastModified = zipEntry.getTime();
        if (lastModified > 31536000000L) {
            row.add(Document.COLUMN_LAST_MODIFIED, lastModified);
        }
    }

    @Override
    public Cursor queryRoots(String[] projection) throws FileNotFoundException {
        final MatrixCursor result = new MatrixCursor(resolveRootProjection(projection));
        synchronized (mRootsLock) {
            for (String rootId : mIdToPath.keySet()) {
                final RootInfo root = mIdToRoot.get(rootId);
                final File path = mIdToPath.get(rootId);

                final RowBuilder row = result.newRow();
                row.add(Root.COLUMN_ROOT_ID, root.rootId);
                row.add(Root.COLUMN_FLAGS, root.flags);
                row.add(Root.COLUMN_TITLE, root.title);
                row.add(Root.COLUMN_DOCUMENT_ID, root.docId);
                row.add(Root.COLUMN_PATH, root.path);
                if (ROOT_ID_PRIMARY_EMULATED.equals(root.rootId) || root.rootId.startsWith(ROOT_ID_SECONDARY)
                        || root.rootId.startsWith(ROOT_ID_PHONE)) {
                    final File file = root.rootId.startsWith(ROOT_ID_PHONE) ? Environment.getRootDirectory() : path;
                    row.add(Root.COLUMN_AVAILABLE_BYTES, file.getFreeSpace());
                    row.add(Root.COLUMN_TOTAL_BYTES, file.getTotalSpace());
                }
            }
        }
        return result;
    }

    @Override
    public boolean isChildDocument(String parentDocId, String docId) {
        try {
            final File parent = getFileForDocId(parentDocId).getCanonicalFile();
            final File doc = getFileForDocId(docId).getCanonicalFile();
            return FileUtils.contains(parent, doc);
        } catch (IOException e) {
            throw new IllegalArgumentException(
                    "Failed to determine if " + docId + " is child of " + parentDocId + ": " + e);
        }
    }

    @Override
    public String createDocument(String docId, String mimeType, String displayName) throws FileNotFoundException {
        displayName = FileUtils.buildValidFatFilename(displayName);

        final File parent = getFileForDocId(docId);
        if (!parent.isDirectory()) {
            throw new IllegalArgumentException("Parent document isn't a directory");
        }

        final File file = FileUtils.buildUniqueFile(parent, mimeType, displayName);
        if (Document.MIME_TYPE_DIR.equals(mimeType)) {
            if (!file.mkdir()) {
                throw new IllegalStateException("Failed to mkdir " + file);
            }
        } else {
            try {
                if (!file.createNewFile()) {
                    throw new IllegalStateException("Failed to touch " + file);
                }
            } catch (IOException e) {
                throw new IllegalStateException("Failed to touch " + file + ": " + e);
            }
        }
        return getDocIdForFile(file);
    }

    @Override
    public void deleteDocument(String docId) throws FileNotFoundException {
        final File file = getFileForDocId(docId);
        if (!FileUtils.deleteFile(file)) {
            throw new IllegalStateException("Failed to delete " + file);
        }
    }

    @Override
    public void moveDocument(String documentIdFrom, String documentIdTo, boolean deleteAfter)
            throws FileNotFoundException {
        final File fileFrom = getFileForDocId(documentIdFrom);
        final File fileTo = getFileForDocId(documentIdTo);
        if (!FileUtils.moveFile(fileFrom, fileTo, null)) {
            throw new IllegalStateException("Failed to copy " + fileFrom);
        } else {
            if (deleteAfter) {
                if (!FileUtils.deleteFile(fileFrom)) {
                    throw new IllegalStateException("Failed to delete " + fileFrom);
                } else {
                    FileUtils.updateMedia(getContext(), fileFrom.getPath());
                }
            }
        }
    }

    @Override
    public String renameDocument(String parentDocumentId, String mimeType, String displayName)
            throws FileNotFoundException {

        // Since this provider treats renames as generating a completely new
        // docId, we're okay with letting the MIME type change.
        displayName = FileUtils.buildValidFatFilename(displayName);

        final File parent = getFileForDocId(parentDocumentId);
        File file;

        if (parent.isDirectory()) {
            file = new File(parent.getParentFile(), FileUtils.removeExtension(mimeType, displayName));
        } else {
            displayName = FileUtils.removeExtension(mimeType, displayName);
            file = new File(parent.getParentFile(), FileUtils.addExtension(mimeType, displayName));
        }

        if (parent.canWrite()) {
            parent.renameTo(file);
        }

        return getDocIdForFile(file);
    }

    @Override
    public String compressDocument(String parentDocumentId, ArrayList<String> documentIds)
            throws FileNotFoundException {
        final File fileFrom = getFileForDocId(parentDocumentId);
        ArrayList<File> files = Lists.newArrayList();
        for (String documentId : documentIds) {
            files.add(getFileForDocId(documentId));
        }
        if (!FileUtils.compressFile(fileFrom, files)) {
            throw new IllegalStateException("Failed to extract " + fileFrom);
        }
        return getDocIdForFile(fileFrom);
    }

    @Override
    public String uncompressDocument(String documentId) throws FileNotFoundException {
        final File fileFrom = getFileForDocId(documentId);
        if (!FileUtils.uncompress(fileFrom)) {
            throw new IllegalStateException("Failed to extract " + fileFrom);
        }
        return getDocIdForFile(fileFrom);
    }

    @Override
    public Cursor queryDocument(String documentId, String[] projection) throws FileNotFoundException {
        final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection));
        updateSettings();
        includeFile(result, documentId, null);
        return result;
    }

    @Override
    public Cursor queryChildDocuments(String parentDocumentId, String[] projection, String sortOrder)
            throws FileNotFoundException {
        String mimeType = getDocumentType(parentDocumentId);
        final File parent = getFileForDocId(parentDocumentId);
        final MatrixCursor result = new DirectoryCursor(resolveDocumentProjection(projection), parentDocumentId,
                parent);
        updateSettings();
        if (!MimePredicate.mimeMatches(MimePredicate.COMPRESSED_MIMES, mimeType)) {
            for (File file : parent.listFiles()) {
                includeFile(result, null, file);
            }
        } else {
            handleCompressedFile(result, parentDocumentId, parent);
        }
        return result;
    }

    @SuppressWarnings("resource")
    private void handleCompressedFile(MatrixCursor result, String parentDocumentId, File parent) {
        try {
            ZipInputStream zipInputStream = new ZipInputStream(new FileInputStream(parent.getPath()));
            ZipEntry zipEntry;

            while ((zipEntry = zipInputStream.getNextEntry()) != null) {
                includeZIPFile(result, null, zipEntry);
            }
        } catch (Exception e) {
        }
    }

    @Override
    public Cursor querySearchDocuments(String rootId, String query, String[] projection)
            throws FileNotFoundException {
        final MatrixCursor result = new MatrixCursor(resolveDocumentProjection(projection));

        final File parent;
        synchronized (mRootsLock) {
            parent = mIdToPath.get(rootId);
        }

        /*        final LinkedList<File> pending = new LinkedList<File>();
                pending.add(parent);
                while (!pending.isEmpty() && result.getCount() < 24) {
        final File file = pending.removeFirst();
        if (file.isDirectory()) {
            for (File child : file.listFiles()) {
                pending.add(child);
            }
        }
        if (file.getName().toLowerCase().contains(query)) {
            includeFile(result, null, file);
        }
                }*/
        updateSettings();
        for (File file : FileUtils.searchDirectory(parent.getPath(), query)) {
            includeFile(result, null, file);
        }
        return result;
    }

    @Override
    public String getDocumentType(String documentId) throws FileNotFoundException {
        final File file = getFileForDocId(documentId);
        return getTypeForFile(file);
    }

    @TargetApi(Build.VERSION_CODES.KITKAT)
    @Override
    public ParcelFileDescriptor openDocument(String documentId, String mode, CancellationSignal signal)
            throws FileNotFoundException {
        final File file = getFileForDocId(documentId);
        if (Utils.hasKitKat()) {
            final int pfdMode = ParcelFileDescriptor.parseMode(mode);
            if (pfdMode == ParcelFileDescriptor.MODE_READ_ONLY) {
                return ParcelFileDescriptor.open(file, pfdMode);
            } else {
                try {
                    // When finished writing, kick off media scanner
                    return ParcelFileDescriptor.open(file, pfdMode, mHandler,
                            new ParcelFileDescriptor.OnCloseListener() {
                                @Override
                                public void onClose(IOException e) {
                                    FileUtils.updateMedia(getContext(), file.getPath());
                                }
                            });
                } catch (IOException e) {
                    throw new FileNotFoundException("Failed to open for writing: " + e);
                }
            }
        } else {
            return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);//ParcelFileDescriptor.parseMode(mode));
        }
    }

    @Override
    public AssetFileDescriptor openDocumentThumbnail(String documentId, Point sizeHint, CancellationSignal signal)
            throws FileNotFoundException {
        return openOrCreateDocumentThumbnail(documentId, sizeHint, signal);
    }

    public AssetFileDescriptor openOrCreateDocumentThumbnail(String docId, Point sizeHint,
            CancellationSignal signal) throws FileNotFoundException {
        //        final ContentResolver resolver = getContext().getContentResolver();
        final File file = getFileForDocId(docId);
        final String mimeType = getTypeForFile(file);

        final String typeOnly = mimeType.split("/")[0];

        final long token = Binder.clearCallingIdentity();
        try {
            if (MediaDocumentsProvider.TYPE_AUDIO.equals(typeOnly)) {
                final long id = getAlbumForPathCleared(file.getPath());
                return openOrCreateAudioThumbnailCleared(id, signal);
            } else if (MediaDocumentsProvider.TYPE_IMAGE.equals(typeOnly)) {
                final long id = getImageForPathCleared(file.getPath());
                return openOrCreateImageThumbnailCleared(id, signal);
            } else if (MediaDocumentsProvider.TYPE_VIDEO.equals(typeOnly)) {
                final long id = getVideoForPathCleared(file.getPath());
                return openOrCreateVideoThumbnailCleared(id, signal);
            } else {
                return DocumentsContract.openImageThumbnail(file);
            }
        } finally {
            Binder.restoreCallingIdentity(token);
        }
    }

    private static String getTypeForFile(File file) {
        if (file.isDirectory()) {
            return Document.MIME_TYPE_DIR;
        } else {
            return getTypeForName(file.getName());
        }
    }

    private static String getTypeForName(String name) {
        final int lastDot = name.lastIndexOf('.');
        if (lastDot >= 0) {
            final String extension = name.substring(lastDot + 1).toLowerCase();
            final String mime = MimeTypes.getMimeTypeFromExtension(extension);
            if (mime != null) {
                return mime;
            }
        }

        return "application/octet-stream";
    }

    private void startObserving(File file, Uri notifyUri) {
        synchronized (mObservers) {
            DirectoryObserver observer = mObservers.get(file);
            if (observer == null) {
                observer = new DirectoryObserver(file, getContext().getContentResolver(), notifyUri);
                observer.startWatching();
                mObservers.put(file, observer);
            }
            observer.mRefCount++;

            if (LOG_INOTIFY)
                Log.d(TAG, "after start: " + observer);
        }
    }

    private void stopObserving(File file) {
        synchronized (mObservers) {
            DirectoryObserver observer = mObservers.get(file);
            if (observer == null)
                return;

            observer.mRefCount--;
            if (observer.mRefCount == 0) {
                mObservers.remove(file);
                observer.stopWatching();
            }

            if (LOG_INOTIFY)
                Log.d(TAG, "after stop: " + observer);
        }
    }

    private class DirectoryObserver extends FileObserver {
        private static final int NOTIFY_EVENTS = ATTRIB | CLOSE_WRITE | MOVED_FROM | MOVED_TO | CREATE | DELETE
                | DELETE_SELF | MOVE_SELF;

        private final File mFile;
        private final ContentResolver mResolver;
        private final Uri mNotifyUri;

        private int mRefCount = 0;

        public DirectoryObserver(File file, ContentResolver resolver, Uri notifyUri) {
            super(file.getAbsolutePath(), NOTIFY_EVENTS);
            mFile = file;
            mResolver = resolver;
            mNotifyUri = notifyUri;
        }

        @Override
        public void onEvent(int event, String path) {
            if ((event & NOTIFY_EVENTS) != 0) {
                if (LOG_INOTIFY)
                    Log.d(TAG, "onEvent() " + event + " at " + path);
                //notify roots changed
                //mResolver.notifyChange(DocumentsContract.buildRootsUri(AUTHORITY), null, false);
                switch ((event & NOTIFY_EVENTS)) {
                case MOVED_FROM:
                case MOVED_TO:
                case CREATE:
                case DELETE:
                    mResolver.notifyChange(mNotifyUri, null, false);
                    FileUtils.updateMedia(getContext(), FileUtils.makeFilePath(mFile, path));
                    break;
                }
            }
        }

        @Override
        public String toString() {
            return "DirectoryObserver{file=" + mFile.getAbsolutePath() + ", ref=" + mRefCount + "}";
        }
    }

    private class DirectoryCursor extends MatrixCursor {
        private final File mFile;

        public DirectoryCursor(String[] columnNames, String docId, File file) {
            super(columnNames);

            final Uri notifyUri = DocumentsContract.buildChildDocumentsUri(AUTHORITY, docId);
            setNotificationUri(getContext().getContentResolver(), notifyUri);

            mFile = file;
            startObserving(mFile, notifyUri);
        }

        @Override
        public void close() {
            super.close();
            stopObserving(mFile);
        }
    }
}