Android Open Source - colibri Active Content Provider

From Project

Back to project page colibri.
License

The source code is released under:
Apache License
If you think the Android project colibri listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.
Java Source Code

package labrom.colibri.data;
//from   w ww  .  j a v a 2 s  .co  m
import android.content.ContentProvider;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.provider.BaseColumns;

/**
 * A generic content provider for manipulating active records.
 * Implementing classes must implement {@link #getProto(Uri)} to determine
 * which type of active record the provider will work with in each operation.
 * 
 * @author Romain Laboisse labrom@gmail.com
 *
 */
public abstract class ActiveContentProvider extends ContentProvider {
  
  private Database db;
  
  /**
   * Returns a prototype active record object to use for querying or updating or inserting data.
   * If the URI is not supported by this content provider, it should return null.
   * @param uri
   * @return A prototype active record object or null if the specified URI is not supported.
   */
  protected abstract <T extends ActiveRecord> T getProto(Uri uri);
  
  protected Database getDatabase() {
      return db;
  }
  
  /**
   * Implementing classes MUST call this method from {@link ContentProvider#onCreate()}.
   * @param db
   */
  protected void setDatabase(Database db) {
    this.db = db;
  }

  /**
   * If provided URI ends with a DB _ID, will replace whatever was in selection and selectionArgs
   * parameters with a WHERE clause that filters on the extracted DB _ID. Otherwise, passes the selection
   * and selectionArgs parameters to the underlying DB without modifying them.
   */
  @Override
  public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
        ActiveRecord proto = getProto(uri);
        if(proto == null)
            throw new IllegalArgumentException(uri.toString() + " is not supported by this content provider");
    long id = -1;
    try {
      id = ContentUris.parseId(uri);
    } catch(NumberFormatException e) {
      // URI doesn't end with an ID, that's fine
    }
    if(id >= 0) {
      selection = BaseColumns._ID + "=?";
      selectionArgs = new String[] {String.valueOf(id)};
    }
        return db.query(proto, projection, selection, selectionArgs, sortOrder).getCursor();
  }
  
  @Override
  public String getType(Uri uri) {
    return null;
  }

  @Override
  public Uri insert(Uri uri, ContentValues values) {
        ActiveRecord proto = getProto(uri);
        if(proto == null)
            throw new IllegalArgumentException(uri.toString() + " is not supported by this content provider");
    SQLiteDatabase sqlite = db.ensureOpen();
        long id = sqlite.insert(proto.getTableName(), null, values);
    if(id >= 0) {
            getContext().getContentResolver().notifyChange(uri, null);
        return ContentUris.withAppendedId(uri, id);
    }
    return null;
  }

  @Override
  public int delete(Uri uri, String selection, String[] selectionArgs) {
        ActiveRecord proto = getProto(uri);
        if(proto == null)
            throw new IllegalArgumentException(uri.toString() + " is not supported by this content provider");
    long id = ContentUris.parseId(uri);
    if(id >= 0) {
      SQLiteDatabase sqlite = db.ensureOpen();
      return sqlite.delete(proto.getTableName(), BaseColumns._ID + "=?", new String[] {String.valueOf(id)});
    }
    return 0;
  }

  @Override
  public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        ActiveRecord proto = getProto(uri);
        if(proto == null)
            throw new IllegalArgumentException(uri.toString() + " is not supported by this content provider");
      long id = ContentUris.parseId(uri);
      if(id >= 0) {
          selection = BaseColumns._ID + "=?";
          selectionArgs = new String[] {String.valueOf(id)};
      }
        SQLiteDatabase sqlite = db.ensureOpen();
        int modified = sqlite.update(proto.getTableName(), values, selection, selectionArgs);
        if(modified > 0)
            getContext().getContentResolver().notifyChange(uri, null);
        return modified;
  }

}
Java Source Code List
