From d361e724edc30cfccfc9d2ae9b67f274329eb262 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C5=81ukasz=20Paczos?= <lukas.paczos@gmail.com>
Date: Mon, 24 Sep 2018 16:04:07 +0200
Subject: [android] check external database's read/write permissions
 asynchronously

---
 .../java/com/mapbox/mapboxsdk/utils/FileUtils.java | 121 +++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java

(limited to 'platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java')

diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java
new file mode 100644
index 0000000000..b7d09cda2a
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/utils/FileUtils.java
@@ -0,0 +1,121 @@
+package com.mapbox.mapboxsdk.utils;
+
+import android.os.AsyncTask;
+
+import java.io.File;
+import java.lang.ref.WeakReference;
+
+public class FileUtils {
+
+  /**
+   * Task checking whether app's process can read a file.
+   */
+  public static class CheckFileReadPermissionTask extends AsyncTask<File, Void, Boolean> {
+    private final WeakReference<OnCheckFileReadPermissionListener> listenerWeakReference;
+
+    public CheckFileReadPermissionTask(OnCheckFileReadPermissionListener listener) {
+      this.listenerWeakReference = new WeakReference<>(listener);
+    }
+
+    @Override
+    protected Boolean doInBackground(File... files) {
+      try {
+        return files[0].canRead();
+      } catch (Exception ex) {
+        return false;
+      }
+    }
+
+    @Override
+    protected void onCancelled() {
+      OnCheckFileReadPermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        listener.onError();
+      }
+    }
+
+    @Override
+    protected void onPostExecute(Boolean result) {
+      OnCheckFileReadPermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        if (result) {
+          listener.onReadPermissionGranted();
+        } else {
+          listener.onError();
+        }
+      }
+    }
+  }
+
+  /**
+   * Interface definition for a callback invoked when checking file's read permissions.
+   */
+  public interface OnCheckFileReadPermissionListener {
+
+    /**
+     * Invoked when app's process has a permission to read a file.
+     */
+    void onReadPermissionGranted();
+
+    /**
+     * Invoked when app's process doesn't have a permission to read a file or an error occurs.
+     */
+    void onError();
+  }
+
+  /**
+   * Task checking whether app's process can write to a file.
+   */
+  public static class CheckFileWritePermissionTask extends AsyncTask<File, Void, Boolean> {
+    private final WeakReference<OnCheckFileWritePermissionListener> listenerWeakReference;
+
+    public CheckFileWritePermissionTask(OnCheckFileWritePermissionListener listener) {
+      this.listenerWeakReference = new WeakReference<>(listener);
+    }
+
+    @Override
+    protected Boolean doInBackground(File... files) {
+      try {
+        return files[0].canWrite();
+      } catch (Exception ex) {
+        return false;
+      }
+    }
+
+    @Override
+    protected void onCancelled() {
+      OnCheckFileWritePermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        listener.onError();
+      }
+    }
+
+    @Override
+    protected void onPostExecute(Boolean result) {
+      OnCheckFileWritePermissionListener listener = listenerWeakReference.get();
+      if (listener != null) {
+        if (result) {
+          listener.onWritePermissionGranted();
+        } else {
+          listener.onError();
+        }
+      }
+    }
+  }
+
+  /**
+   * Interface definition for a callback invoked when checking file's write permissions.
+   */
+  public interface OnCheckFileWritePermissionListener {
+
+    /**
+     * Invoked when app's process has a permission to write to a file.
+     */
+    void onWritePermissionGranted();
+
+    /**
+     * Invoked when app's process doesn't have a permission to write to a file or an error occurs.
+     */
+    void onError();
+  }
+}
-- 
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