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/*
* Copyright (C) 2015 Dominik Schürmann <dominik@dominikschuermann.de>
* Copyright (C) 2015 Vincent Breitmoser <v.breitmoser@mugenguild.com>
*
* 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.ui.base;
import android.content.Intent;
import android.os.Parcelable;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import org.sufficientlysecure.keychain.R;
import org.sufficientlysecure.keychain.operations.results.OperationResult;
import org.sufficientlysecure.keychain.service.KeychainService;
import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
/** This is a base class for fragments which implement a cryptoOperation.
*
* Subclasses of this class can call the cryptoOperation method to execute an
* operation in KeychainService which takes a parcelable of type T as its input
* and returns an OperationResult of type S as a result.
*
* The input (of type T) is not given directly to the cryptoOperation method,
* but must be provided by the overriden createOperationInput method to be
* available upon request during execution of the cryptoOperation.
*
* After running cryptoOperation, one of the onCryptoOperation*() methods will
* be called, depending on the success status of the operation. The subclass
* must override at least onCryptoOperationSuccess to proceed after a
* successful operation.
*
* @see KeychainService
*
*/
public abstract class CryptoOperationFragment<T extends Parcelable, S extends OperationResult>
extends Fragment implements CryptoOperationHelper.Callback<T, S> {
final private CryptoOperationHelper<T, S> mOperationHelper;
public CryptoOperationFragment(Integer initialProgressMsg) {
mOperationHelper = new CryptoOperationHelper<>(this, this, initialProgressMsg);
}
public CryptoOperationFragment() {
mOperationHelper = new CryptoOperationHelper<>(this, this, R.string.progress_processing);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
mOperationHelper.handleActivityResult(requestCode, resultCode, data);
}
/** Starts execution of the cryptographic operation.
*
* During this process, the createOperationInput() method will be called,
* this input will be handed to KeychainService, where it is executed in
* the appropriate *Operation class. If the result is a PendingInputResult,
* it is handled accordingly. Otherwise, it is returned in one of the
* onCryptoOperation* callbacks.
*/
protected void cryptoOperation() {
mOperationHelper.cryptoOperation();
}
protected void cryptoOperation(CryptoInputParcel cryptoInput) {
mOperationHelper.cryptoOperation(cryptoInput);
}
@Override @Nullable
/** Creates input for the crypto operation. Called internally after the
* crypto operation is started by a call to cryptoOperation(). Silently
* cancels operation if this method returns null. */
public abstract T createOperationInput();
/** Returns false, indicating that we did not handle progress ourselves. */
public boolean onCryptoSetProgress(String msg, int progress, int max) {
return false;
}
public void setProgressMessageResource(int id) {
mOperationHelper.setProgressMessageResource(id);
}
@Override
/** Called when the cryptoOperation() was successful. No default behavior
* here, this should always be implemented by a subclass! */
abstract public void onCryptoOperationSuccess(S result);
@Override
public void onCryptoOperationError(S result) {
result.createNotify(getActivity()).show();
}
@Override
public void onCryptoOperationCancelled() {
}
}
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