Android Open Source - interdroid-vdb Content Change Handler

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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.//w  ww . j  a v  a2  s . c  om
 *
 * 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 java.util.HashMap;
import java.util.Map;

import android.content.ContentValues;

/**
 * Content change handlers that can be used to hook and edit data before
 * various database operations.
 *
 * This class is both a static interface for registering with and an adapter.
 *
 * @author nick <palmer@cs.vu.nl>
 *
 */
public class ContentChangeHandler {
  /**
   * The registered handlers.
   */
  private static Map<String, ContentChangeHandler>handlers =
      new HashMap<String, ContentChangeHandler>();

  /**
   * Returns a handler for the given name in the given namespace.
   * @param namespace the namespace to check in
   * @param name the name to check for
   * @return the content change handler
   */
  public static ContentChangeHandler getHandler(final String namespace,
      final String name) {
    return handlers.get(namespace + "." + name);
  }

  /**
   * The pre-insert hook to modify values (like adding defaults)
   * before an insert is done.
   * @param values the values to be inserted
   */
  public void preInsertHook(final ContentValues values) {
    // Intentionally Blank as we anticipate more methods
    // which makes this an adapter
  }

  /**
   * Register a content change handler for the given name.
   * It is assumed the name includes a namespace.
   * @param name the name to register with
   * @param contentChangeHandler the content change handler
   */
  private static void register(final String name,
      final ContentChangeHandler contentChangeHandler) {
    handlers.put(name, contentChangeHandler);
  }

  /**
   * Register a content change handler for the given name in
   * the given namespace.
   * @param namespace the namespace to register in
   * @param name the name to register
   * @param contentChangeHandler the handler for this type
   */
  public static void register(final String namespace, final String name,
      final ContentChangeHandler contentChangeHandler) {
    register(namespace + "." + name, contentChangeHandler);
  }
}

Java Source Code List

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