| /* |
| * Copyright 2017 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 android.arch.background.workmanager.model; |
| |
| import android.arch.persistence.room.TypeConverter; |
| import android.net.Uri; |
| import android.support.annotation.NonNull; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.ObjectInputStream; |
| import java.io.ObjectOutputStream; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.Set; |
| |
| /** |
| * Stores a set of {@link Trigger}s |
| */ |
| |
| public class ContentUriTriggers implements Iterable<ContentUriTriggers.Trigger> { |
| private final Set<Trigger> mTriggers = new HashSet<>(); |
| |
| /** |
| * Add a Content {@link Uri} to observe |
| * @param uri {@link Uri} to observe |
| * @param triggerForDescendants {@code true} if any changes in descendants cause this |
| * {@link WorkSpec} to run |
| */ |
| public void add(Uri uri, boolean triggerForDescendants) { |
| Trigger trigger = new Trigger(uri, triggerForDescendants); |
| mTriggers.add(trigger); |
| } |
| |
| @NonNull |
| @Override |
| public Iterator<Trigger> iterator() { |
| return mTriggers.iterator(); |
| } |
| |
| /** |
| * @return number of {@link Trigger} objects |
| */ |
| public int size() { |
| return mTriggers.size(); |
| } |
| |
| /** |
| * Converts a list of {@link Trigger}s to byte array representation |
| * @param triggers the list of {@link Trigger}s to convert |
| * @return corresponding byte array representation |
| */ |
| @TypeConverter |
| public static byte[] toByteArray(ContentUriTriggers triggers) { |
| if (triggers.size() == 0) { |
| // Return null for no triggers. Needed for SQL query check in ForegroundProcessor |
| return null; |
| } |
| ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); |
| ObjectOutputStream objectOutputStream = null; |
| try { |
| objectOutputStream = new ObjectOutputStream(outputStream); |
| objectOutputStream.writeInt(triggers.size()); |
| for (Trigger trigger : triggers) { |
| objectOutputStream.writeUTF(trigger.getUri().toString()); |
| objectOutputStream.writeBoolean(trigger.shouldTriggerForDescendants()); |
| } |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } finally { |
| if (objectOutputStream != null) { |
| try { |
| objectOutputStream.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| try { |
| outputStream.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| return outputStream.toByteArray(); |
| } |
| |
| /** |
| * Converts a byte array to list of {@link Trigger}s |
| * @param bytes byte array representation to convert |
| * @return list of {@link Trigger}s |
| */ |
| @TypeConverter |
| public static ContentUriTriggers fromByteArray(byte[] bytes) { |
| ContentUriTriggers triggers = new ContentUriTriggers(); |
| if (bytes == null) { |
| // bytes will be null if there are no Content Uri Triggers |
| return triggers; |
| } |
| ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes); |
| ObjectInputStream objectInputStream = null; |
| try { |
| objectInputStream = new ObjectInputStream(inputStream); |
| for (int i = objectInputStream.readInt(); i > 0; i--) { |
| Uri uri = Uri.parse(objectInputStream.readUTF()); |
| boolean triggersForDescendants = objectInputStream.readBoolean(); |
| triggers.add(uri, triggersForDescendants); |
| } |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } finally { |
| if (objectInputStream != null) { |
| try { |
| objectInputStream.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| try { |
| inputStream.close(); |
| } catch (IOException e) { |
| e.printStackTrace(); |
| } |
| } |
| return triggers; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| ContentUriTriggers that = (ContentUriTriggers) o; |
| |
| return mTriggers.equals(that.mTriggers); |
| } |
| |
| @Override |
| public int hashCode() { |
| return mTriggers.hashCode(); |
| } |
| |
| /** |
| * Defines a content {@link Uri} trigger for a {@link WorkSpec} |
| */ |
| |
| public static class Trigger { |
| @NonNull |
| private final Uri mUri; |
| private final boolean mTriggerForDescendants; |
| |
| public Trigger(@NonNull Uri uri, |
| boolean triggerForDescendants) { |
| mUri = uri; |
| mTriggerForDescendants = triggerForDescendants; |
| } |
| |
| @NonNull |
| public Uri getUri() { |
| return mUri; |
| } |
| |
| /** |
| * @return {@code true} if trigger applies to descendants of {@link Uri} also |
| */ |
| public boolean shouldTriggerForDescendants() { |
| return mTriggerForDescendants; |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) return true; |
| if (o == null || getClass() != o.getClass()) return false; |
| |
| Trigger trigger = (Trigger) o; |
| |
| return mTriggerForDescendants == trigger.mTriggerForDescendants |
| && mUri.equals(trigger.mUri); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = mUri.hashCode(); |
| result = 31 * result + (mTriggerForDescendants ? 1 : 0); |
| return result; |
| } |
| } |
| } |
