Use stub backup and restore components by default in backup transport

src/com/stevesoltys/backup/transport/ConfigurableBackupTransport.java

@@ -9,6 +9,8 @@ import android.os.ParcelFileDescriptor;
 import com.android.internal.util.Preconditions;
 import com.stevesoltys.backup.transport.component.BackupComponent;
 import com.stevesoltys.backup.transport.component.RestoreComponent;
+import com.stevesoltys.backup.transport.component.stub.StubBackupComponent;
+import com.stevesoltys.backup.transport.component.stub.StubRestoreComponent;
 
 /**
  * @author Steve Soltys
@@ -23,8 +25,8 @@ public class ConfigurableBackupTransport extends BackupTransport {
     private RestoreComponent restoreComponent;
 
     public ConfigurableBackupTransport() {
-        backupComponent = null;
-        restoreComponent = null;
+        backupComponent = new StubBackupComponent();
+        restoreComponent = new StubRestoreComponent();
     }
 
     public void initialize(BackupComponent backupComponent, RestoreComponent restoreComponent) {
@@ -37,12 +39,12 @@ public class ConfigurableBackupTransport extends BackupTransport {
     }
 
     public void reset() {
-        backupComponent = null;
-        restoreComponent = null;
+        backupComponent = new StubBackupComponent();
+        restoreComponent = new StubRestoreComponent();
     }
 
     public boolean isActive() {
-        return backupComponent != null && restoreComponent != null;
+        return !(backupComponent instanceof StubBackupComponent || restoreComponent instanceof StubRestoreComponent);
     }
 
     public BackupComponent getBackupComponent() {

src/com/stevesoltys/backup/transport/component/stub/StubBackupComponent.java

@@ -0,0 +1,76 @@
+package com.stevesoltys.backup.transport.component.stub;
+
+import android.content.pm.PackageInfo;
+import android.os.ParcelFileDescriptor;
+import com.stevesoltys.backup.transport.component.BackupComponent;
+
+/**
+ * @author Steve Soltys
+ */
+public class StubBackupComponent implements BackupComponent {
+
+    @Override
+    public String currentDestinationString() {
+        return null;
+    }
+
+    @Override
+    public String dataManagementLabel() {
+        return null;
+    }
+
+    @Override
+    public int initializeDevice() {
+        return 0;
+    }
+
+    @Override
+    public int clearBackupData(PackageInfo packageInfo) {
+        return 0;
+    }
+
+    @Override
+    public int finishBackup() {
+        return 0;
+    }
+
+    @Override
+    public int performIncrementalBackup(PackageInfo targetPackage, ParcelFileDescriptor data) {
+        return 0;
+    }
+
+    @Override
+    public int performFullBackup(PackageInfo targetPackage, ParcelFileDescriptor fileDescriptor) {
+        return 0;
+    }
+
+    @Override
+    public int checkFullBackupSize(long size) {
+        return 0;
+    }
+
+    @Override
+    public int sendBackupData(int numBytes) {
+        return 0;
+    }
+
+    @Override
+    public void cancelFullBackup() {
+
+    }
+
+    @Override
+    public long getBackupQuota(String packageName, boolean fullBackup) {
+        return 0;
+    }
+
+    @Override
+    public long requestBackupTime() {
+        return 0;
+    }
+
+    @Override
+    public long requestFullBackupTime() {
+        return 0;
+    }
+}

src/com/stevesoltys/backup/transport/component/stub/StubRestoreComponent.java

@@ -0,0 +1,53 @@
+package com.stevesoltys.backup.transport.component.stub;
+
+import android.content.pm.PackageInfo;
+import android.os.ParcelFileDescriptor;
+import com.stevesoltys.backup.transport.component.RestoreComponent;
+import android.app.backup.RestoreDescription;
+import android.app.backup.RestoreSet;
+
+/**
+ * @author Steve Soltys
+ */
+public class StubRestoreComponent implements RestoreComponent {
+
+    @Override
+    public int startRestore(long token, PackageInfo[] packages) {
+        return 0;
+    }
+
+    @Override
+    public RestoreDescription nextRestorePackage() {
+        return null;
+    }
+
+    @Override
+    public int getRestoreData(ParcelFileDescriptor outputFileDescriptor) {
+        return 0;
+    }
+
+    @Override
+    public int getNextFullRestoreDataChunk(ParcelFileDescriptor socket) {
+        return 0;
+    }
+
+    @Override
+    public int abortFullRestore() {
+        return 0;
+    }
+
+    @Override
+    public long getCurrentRestoreSet() {
+        return 0;
+    }
+
+    @Override
+    public void finishRestore() {
+
+    }
+
+    @Override
+    public RestoreSet[] getAvailableRestoreSets() {
+        return new RestoreSet[0];
+    }
+}