OPML export: Choose export folder (#3175)

1 files changed, 72 insertions, 0 deletions

diff --git a/app/src/main/java/de/danoeh/antennapod/asynctask/DocumentFileExportWorker.java b/app/src/main/java/de/danoeh/antennapod/asynctask/DocumentFileExportWorker.java
new file mode 100644
index 000000000..0e9572a82
--- /dev/null
+++ b/app/src/main/java/de/danoeh/antennapod/asynctask/DocumentFileExportWorker.java
@@ -0,0 +1,72 @@
+package de.danoeh.antennapod.asynctask;
+
+import android.content.Context;
+import android.net.Uri;
+import android.support.annotation.NonNull;
+import android.support.v4.provider.DocumentFile;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.OutputStreamWriter;
+
+import de.danoeh.antennapod.core.export.ExportWriter;
+import de.danoeh.antennapod.core.storage.DBReader;
+import de.danoeh.antennapod.core.util.LangUtils;
+import io.reactivex.Observable;
+
+/**
+ * Writes an OPML file into the user selected export directory in the background.
+ */
+public class DocumentFileExportWorker {
+
+    private final @NonNull ExportWriter exportWriter;
+    private @NonNull Context context;
+    private @NonNull Uri outputFileUri;
+
+    public DocumentFileExportWorker(@NonNull ExportWriter exportWriter, @NonNull Context context, @NonNull Uri outputFileUri) {
+        this.exportWriter = exportWriter;
+        this.context = context;
+        this.outputFileUri = outputFileUri;
+    }
+
+    public Observable<DocumentFile> exportObservable() {
+        DocumentFile output = DocumentFile.fromSingleUri(context, outputFileUri);
+        return Observable.create(subscriber -> {
+            OutputStream outputStream = null;
+            OutputStreamWriter writer = null;
+            try {
+                Uri uri = output.getUri();
+                if (uri == null) {
+                    throw new FileNotFoundException("Export file not found.");
+                }
+                outputStream = context.getContentResolver().openOutputStream(uri);
+                if (outputStream == null) {
+                    throw new IOException();
+                }
+                writer = new OutputStreamWriter(outputStream, LangUtils.UTF_8);
+                exportWriter.writeDocument(DBReader.getFeedList(), writer);
+                subscriber.onNext(output);
+            } catch (IOException e) {
+                subscriber.onError(e);
+            } finally {
+                if (writer != null) {
+                    try {
+                        writer.close();
+                    } catch (IOException e) {
+                        subscriber.onError(e);
+                    }
+                }
+                if (outputStream != null) {
+                    try {
+                        outputStream.close();
+                    } catch (IOException e) {
+                        subscriber.onError(e);
+                    }
+                }
+                subscriber.onComplete();
+            }
+        });
+    }
+
+}