move classes around a bit

OpenKeychain/src/main/java/org/sufficientlysecure/keychain/util/FileImportCache.java

@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2014 Dominik Schürmann <dominik@dominikschuermann.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.sufficientlysecure.keychain.util;
+
+import android.content.Context;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.KeychainApplication;
+import org.sufficientlysecure.keychain.util.Log;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+/**
+ * When sending large data (over 1MB) through Androids Binder IPC you get
+ * JavaBinder  E  !!! FAILED BINDER TRANSACTION !!!
+ * <p/>
+ * To overcome this problem, we cache large Parcelables into a file in our private cache directory
+ * instead of sending them through IPC.
+ */
+public class FileImportCache<E extends Parcelable> {
+
+    private Context mContext;
+
+    private static final String FILENAME = "key_import.pcl";
+
+    public FileImportCache(Context context) {
+        this.mContext = context;
+    }
+
+    public void writeCache(ArrayList<E> selectedEntries) throws IOException {
+        writeCache(selectedEntries.iterator());
+    }
+
+    public void writeCache(Iterator<E> it) throws IOException {
+
+        File cacheDir = mContext.getCacheDir();
+        if (cacheDir == null) {
+            // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU
+            throw new IOException("cache dir is null!");
+        }
+
+        File tempFile = new File(mContext.getCacheDir(), FILENAME);
+
+        ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(tempFile));
+
+        while (it.hasNext()) {
+            E ring = it.next();
+            Parcel p = Parcel.obtain(); // creating empty parcel object
+            p.writeParcelable(ring, 0); // saving bundle as parcel
+            oos.writeObject(p.marshall()); // writing parcel to file
+            p.recycle();
+        }
+
+        oos.close();
+
+    }
+
+    public List<E> readCacheIntoList() throws IOException {
+        ArrayList<E> result = new ArrayList<E>();
+        Iterator<E> it = readCache();
+        while (it.hasNext()) {
+            result.add(it.next());
+        }
+        return result;
+    }
+
+    public Iterator<E> readCache() throws IOException {
+
+        File cacheDir = mContext.getCacheDir();
+        if (cacheDir == null) {
+            // https://groups.google.com/forum/#!topic/android-developers/-694j87eXVU
+            throw new IOException("cache dir is null!");
+        }
+
+        final File tempFile = new File(cacheDir, FILENAME);
+        final ObjectInputStream ois = new ObjectInputStream(new FileInputStream(tempFile));
+
+        return new Iterator<E>() {
+
+            E mRing = null;
+            boolean closed = false;
+
+            private void readNext() {
+                if (mRing != null || closed) {
+                    Log.e(Constants.TAG, "err!");
+                    return;
+                }
+
+                try {
+                    if (ois.available() == 0) {
+                        return;
+                    }
+
+                    byte[] data = (byte[]) ois.readObject();
+                    Log.e(Constants.TAG, "bla");
+                    if (data == null) {
+                        if (!closed) {
+                            closed = true;
+                            ois.close();
+                            tempFile.delete();
+                        }
+                        return;
+                    }
+
+                    Parcel parcel = Parcel.obtain(); // creating empty parcel object
+                    parcel.unmarshall(data, 0, data.length);
+                    parcel.setDataPosition(0);
+                    mRing = parcel.readParcelable(KeychainApplication.class.getClassLoader());
+                    parcel.recycle();
+                } catch (ClassNotFoundException e) {
+                    Log.e(Constants.TAG, "Encountered ClassNotFoundException during cache read, this is a bug!");
+                } catch (IOException e) {
+                    Log.e(Constants.TAG, "Encountered IOException during cache read!");
+                }
+
+            }
+
+            @Override
+            public boolean hasNext() {
+                readNext();
+                return mRing != null;
+            }
+
+            @Override
+            public E next() {
+                readNext();
+                try {
+                    return mRing;
+                } finally {
+                    mRing = null;
+                }
+            }
+
+            @Override
+            public void remove() {
+                throw new UnsupportedOperationException();
+            }
+
+            @Override
+            public void finalize() throws Throwable {
+                super.finalize();
+                if (!closed) {
+                    try {
+                        ois.close();
+                        tempFile.delete();
+                    } catch (IOException e) {
+                        // never mind
+                    }
+                }
+            }
+
+        };
+    }
+}