Android Open Source - My-Wallet-Android Address Book Provider

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License

The source code is released under:
GNU General Public License
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Java Source Code

/*
 * Copyright 2011-2012 the original author or authors.
 */*w  w w  . jav  a  2 s.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 piuk.blockchain.android;

import java.util.List;

import android.content.ContentProvider;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteQueryBuilder;
import android.net.Uri;

/**
 * @author Andreas Schildbach
 */
public class AddressBookProvider extends ContentProvider
{
  private static final String DATABASE_TABLE = "address_book";

  public static final Uri CONTENT_URI = Uri.parse("content://" + Constants.PACKAGE_NAME + '.' + DATABASE_TABLE);

  public static final String KEY_ROWID = "_id";
  public static final String KEY_ADDRESS = "address";
  public static final String KEY_LABEL = "label";

  public static final String SELECTION_QUERY = "q";
  public static final String SELECTION_IN = "in";
  public static final String SELECTION_NOTIN = "notin";

  public static void setLabel(final ContentResolver contentResolver, final String address, String newLabel) {

    final String label = AddressBookProvider.resolveLabel(contentResolver, address);

    final boolean isAdd = label == null;
    
    Uri uri = AddressBookProvider.CONTENT_URI.buildUpon().appendPath(address).build();

    newLabel = newLabel.trim();

    if (newLabel.length() > 0)
    {
      final ContentValues values = new ContentValues();
      values.put(AddressBookProvider.KEY_LABEL, newLabel);

      if (isAdd)
        contentResolver.insert(uri, values);
      else
        contentResolver.update(uri, values, null, null);
    }
    else if (!isAdd)
    {
      contentResolver.delete(uri, null, null);
    }
  }

  public static String resolveLabel(final ContentResolver contentResolver, final String address)
  {
    String label = null;

    final Uri uri = AddressBookProvider.CONTENT_URI.buildUpon().appendPath(address).build();
    final Cursor cursor = contentResolver.query(uri, null, null, null, null);

    if (cursor != null)
    {
      if (cursor.moveToFirst())
        label = cursor.getString(cursor.getColumnIndexOrThrow(AddressBookProvider.KEY_LABEL));

      cursor.close();
    }

    return label;
  }

  private Helper helper;

  @Override
  public boolean onCreate()
  {
    helper = new Helper(getContext());
    return true;
  }

  @Override
  public String getType(final Uri uri)
  {
    throw new UnsupportedOperationException();
  }

  @Override
  public Uri insert(final Uri uri, final ContentValues values)
  {
    if (uri.getPathSegments().size() != 1)
      throw new IllegalArgumentException(uri.toString());

    final String address = uri.getLastPathSegment();
    values.put(KEY_ADDRESS, address);

    long rowId = helper.getWritableDatabase().insertOrThrow(DATABASE_TABLE, null, values);

    final Uri rowUri = CONTENT_URI.buildUpon().appendPath(address).appendPath(Long.toString(rowId)).build();

    getContext().getContentResolver().notifyChange(rowUri, null);

    return rowUri;
  }

  @Override
  public int update(final Uri uri, final ContentValues values, final String selection, final String[] selectionArgs)
  {
    if (uri.getPathSegments().size() != 1)
      throw new IllegalArgumentException(uri.toString());

    final String address = uri.getLastPathSegment();

    final int count = helper.getWritableDatabase().update(DATABASE_TABLE, values, KEY_ADDRESS + "=?", new String[] { address });

    if (count > 0)
      getContext().getContentResolver().notifyChange(uri, null);

    return count;
  }

  @Override
  public int delete(final Uri uri, final String selection, final String[] selectionArgs)
  {
    final List<String> pathSegments = uri.getPathSegments();
    if (pathSegments.size() != 1)
      throw new IllegalArgumentException(uri.toString());

    final String address = uri.getLastPathSegment();

    final int count = helper.getWritableDatabase().delete(DATABASE_TABLE, KEY_ADDRESS + "=?", new String[] { address });

    if (count > 0)
      getContext().getContentResolver().notifyChange(uri, null);

    return count;
  }

  @Override
  public Cursor query(final Uri uri, final String[] projection, final String originalSelection, final String[] originalSelectionArgs,
      final String sortOrder)
  {
    final SQLiteQueryBuilder qb = new SQLiteQueryBuilder();
    qb.setTables(DATABASE_TABLE);

    final List<String> pathSegments = uri.getPathSegments();
    if (pathSegments.size() > 1)
      throw new IllegalArgumentException(uri.toString());

    String selection = null;
    String[] selectionArgs = null;

    if (pathSegments.size() == 1)
    {
      final String address = uri.getLastPathSegment();

      qb.appendWhere(KEY_ADDRESS + "=");
      qb.appendWhereEscapeString(address);
    }
    else if (SELECTION_IN.equals(originalSelection))
    {
      final String[] addresses = originalSelectionArgs[0].trim().split(",");

      qb.appendWhere(KEY_ADDRESS + " IN (");
      appendAddresses(qb, addresses);
      qb.appendWhere(")");
    }
    else if (SELECTION_NOTIN.equals(originalSelection))
    {
      final String[] addresses = originalSelectionArgs[0].trim().split(",");

      qb.appendWhere(KEY_ADDRESS + " NOT IN (");
      appendAddresses(qb, addresses);
      qb.appendWhere(")");
    }
    else if (SELECTION_QUERY.equals(originalSelection))
    {
      final String query = '%' + originalSelectionArgs[0].trim() + '%';
      selection = KEY_ADDRESS + " LIKE ? OR " + KEY_LABEL + " LIKE ?";
      selectionArgs = new String[] { query, query };
    }

    final Cursor cursor = qb.query(helper.getReadableDatabase(), projection, selection, selectionArgs, null, null, sortOrder);

    cursor.setNotificationUri(getContext().getContentResolver(), uri);

    return cursor;
  }

  private static void appendAddresses(final SQLiteQueryBuilder qb, final String[] addresses)
  {
    for (final String address : addresses)
    {
      qb.appendWhereEscapeString(address.trim());
      if (!address.equals(addresses[addresses.length - 1]))
        qb.appendWhere(",");
    }
  }

  private static class Helper extends SQLiteOpenHelper
  {
    private static final String DATABASE_NAME = "address_book";
    private static final int DATABASE_VERSION = 1;

    private static final String DATABASE_CREATE = "CREATE TABLE " + DATABASE_TABLE + " (" //
        + KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " //
        + KEY_ADDRESS + " TEXT NOT NULL, " //
        + KEY_LABEL + " TEXT NULL);";

    public Helper(final Context context)
    {
      super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(final SQLiteDatabase db)
    {
      db.execSQL(DATABASE_CREATE);
    }

    @Override
    public void onUpgrade(final SQLiteDatabase db, final int oldVersion, final int newVersion)
    {
      db.beginTransaction();
      try
      {
        for (int v = oldVersion; v < newVersion; v++)
          upgrade(db, v);

        db.setTransactionSuccessful();
      }
      finally
      {
        db.endTransaction();
      }
    }

    private void upgrade(final SQLiteDatabase db, final int oldVersion)
    {
      if (oldVersion == 1)
      {
        // future
      }
      else
      {
        throw new UnsupportedOperationException("old=" + oldVersion);
      }
    }
  }
}
Java Source Code List
