content: /*
   * Copyright (C) 2006 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.database.sqlite;
  
  import android.database.CursorWindow;
  import android.os.CancellationSignal;
  import android.os.OperationCanceledException;
  import android.util.Log;
  
  /**
   * Represents a query that reads the resulting rows into a {@link SQLiteQuery}.
   * This class is used by {@link SQLiteCursor} and isn't useful itself.
   * <p>
   * This class is not thread-safe.
   * </p>
   */
  public final class SQLiteQuery extends SQLiteProgram {
      private static final String TAG = "SQLiteQuery";
  
      private final CancellationSignal mCancellationSignal;
  
      SQLiteQuery(SQLiteDatabase db, String query, CancellationSignal cancellationSignal) {
          super(db, query, null, cancellationSignal);
  
          mCancellationSignal = cancellationSignal;
      }
  
      /**
       * Reads rows into a buffer.
       *
       * @param window The window to fill into
       * @param startPos The start position for filling the window.
       * @param requiredPos The position of a row that MUST be in the window.
       * If it won't fit, then the query should discard part of what it filled.
       * @param countAllRows True to count all rows that the query would
       * return regardless of whether they fit in the window.
       * @return Number of rows that were enumerated.  Might not be all rows
       * unless countAllRows is true.
       *
       * @throws SQLiteException if an error occurs.
       * @throws OperationCanceledException if the operation was canceled.
       */
      int fillWindow(CursorWindow window, int startPos, int requiredPos, boolean countAllRows) {
          acquireReference();
          try {
              window.acquireReference();
              try {
                  int numRows = getSession().executeForCursorWindow(getSql(), getBindArgs(),
                          window, startPos, requiredPos, countAllRows, getConnectionFlags(),
                          mCancellationSignal);
                  return numRows;
              } catch (SQLiteDatabaseCorruptException ex) {
                  onCorruption();
                  throw ex;
              } catch (SQLiteException ex) {
                  Log.e(TAG, "exception: " + ex.getMessage() + "; query: " + getSql());
                  throw ex;
              } finally {
                  window.releaseReference();
              }
          } finally {
              releaseReference();
          }
      }
  
      @Override
      public String toString() {
          return "SQLiteQuery: " + getSql();
      }
  }
  