Android Open Source - bitfynd-wallet-android Send Coins Offline Task

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License

The source code is released under:

GNU General Public License

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Java Source Code

/*
 * Copyright 2013-2014 the original author or authors.
 */* w w  w  . j a va2s.  c o m*/
 * 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 de.schildbach.wallet.ui.send;

import javax.annotation.Nonnull;

import org.bitcoinj.core.Coin;
import org.bitcoinj.core.InsufficientMoneyException;
import org.bitcoinj.core.Transaction;
import org.bitcoinj.core.Wallet;
import org.bitcoinj.core.Wallet.CompletionException;
import org.bitcoinj.core.Wallet.CouldNotAdjustDownwards;
import org.bitcoinj.core.Wallet.SendRequest;
import org.bitcoinj.crypto.KeyCrypterException;

import android.os.Handler;
import android.os.Looper;

/**
 * @author Andreas Schildbach
 */
public abstract class SendCoinsOfflineTask
{
  private final Wallet wallet;
  private final Handler backgroundHandler;
  private final Handler callbackHandler;

  public SendCoinsOfflineTask(@Nonnull final Wallet wallet, @Nonnull final Handler backgroundHandler)
  {
    this.wallet = wallet;
    this.backgroundHandler = backgroundHandler;
    this.callbackHandler = new Handler(Looper.myLooper());
  }

  public final void sendCoinsOffline(@Nonnull final SendRequest sendRequest)
  {
    backgroundHandler.post(new Runnable()
    {
      @Override
      public void run()
      {
        try
        {
          final Transaction transaction = wallet.sendCoinsOffline(sendRequest); // can take long

          callbackHandler.post(new Runnable()
          {
            @Override
            public void run()
            {
              onSuccess(transaction);
            }
          });
        }
        catch (final InsufficientMoneyException x)
        {
          callbackHandler.post(new Runnable()
          {
            @Override
            public void run()
            {
              onInsufficientMoney(x.missing);
            }
          });
        }
        catch (final KeyCrypterException x)
        {
          callbackHandler.post(new Runnable()
          {
            @Override
            public void run()
            {
              onInvalidKey();
            }
          });
        }
        catch (final CouldNotAdjustDownwards x)
        {
          callbackHandler.post(new Runnable()
          {
            @Override
            public void run()
            {
              onEmptyWalletFailed();
            }
          });
        }
        catch (final CompletionException x)
        {
          callbackHandler.post(new Runnable()
          {
            @Override
            public void run()
            {
              onFailure(x);
            }
          });
        }
      }
    });
  }

  protected abstract void onSuccess(@Nonnull Transaction transaction);

  protected abstract void onInsufficientMoney(@Nonnull Coin missing);

  protected abstract void onInvalidKey();

  protected void onEmptyWalletFailed()
  {
    onFailure(new CouldNotAdjustDownwards());
  }

  protected abstract void onFailure(@Nonnull Exception exception);
}

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