content: /*
   * Copyright (C) 2007 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package android.widget;
  
  import android.database.Cursor;
  
  /**
   * This class can be used by external clients of CursorAdapter and
   * CursorTreeAdapter to define how the content of the adapter should be
   * filtered.
   * 
   * @see #runQuery(CharSequence)
   */
  public interface FilterQueryProvider {
      /**
       * Runs a query with the specified constraint. This query is requested
       * by the filter attached to this adapter.
       *
       * Contract: when constraint is null or empty, the original results,
       * prior to any filtering, must be returned.
       *
       * @param constraint the constraint with which the query must
       *        be filtered
       *
       * @return a Cursor representing the results of the new query
       */
      Cursor runQuery(CharSequence constraint);
  }
  