Android Open Source - interdroid-vdb Cross Process Cursor Wrapper

• Back to SQLite/database  ↑

From Project

Back to project page interdroid-vdb.

License

The source code is released under:

Copyright (c) 2008-2012 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

Java Source Code

/*
 * Copyright (c) 2008-2012 Vrije Universiteit, The Netherlands All rights
 * reserved./*from w  w  w .j  a  v a  2  s . com*/
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the Vrije Universiteit nor the names of its contributors
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package interdroid.vdb.content;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.database.CrossProcessCursor;
import android.database.Cursor;
import android.database.CursorWindow;
import android.database.CursorWrapper;

/**
 * A wrapper for cursors that are used across processes.
 * @author nick <palmer@cs.vu.nl>
 *
 */
public class CrossProcessCursorWrapper extends CursorWrapper
  implements CrossProcessCursor {
  /**
   * The logger.
   */
  private static final Logger LOG =
      LoggerFactory.getLogger(CrossProcessCursorWrapper.class);

  /**
   * Construct a cross process cursor.
   * @param cursor the cursor to wrap.
   */
  public CrossProcessCursorWrapper(final Cursor cursor) {
    super(cursor);
    LOG.debug("Built cross process cursor.");
  }

  @Override
  public final CursorWindow getWindow() {
    return null;
  }

  @Override
  public final void fillWindow(final int position,
      final CursorWindow window) {
    if (position < 0 || position > getCount()) {
      return;
    }
    window.acquireReference();
    try {
      moveToPosition(position - 1);
      window.clear();
      window.setStartPosition(position);
      int columnNum = getColumnCount();
      window.setNumColumns(columnNum);
      while (moveToNext() && window.allocRow()) {
        for (int i = 0; i < columnNum; i++) {
          String field = getString(i);
          if (field != null) {
            if (!window.putString(field, getPosition(), i)) {
              window.freeLastRow();
              break;
            }
          } else {
            if (!window.putNull(getPosition(), i)) {
              window.freeLastRow();
              break;
            }
          }
        }
      }
    } catch (IllegalStateException e) {
      LOG.error("Exception with wrapped cursor", e);
    } finally {
      window.releaseReference();
    }
  }

  @Override
  public final boolean onMove(final int oldPosition, final int newPosition) {
    return true;
  }
}

Java Source Code List

• Back to SQLite/database  ↑