/*

   Derby - Class org.apache.derby.impl.sql.execute.IndexRow

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to you 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 org.apache.derby.impl.sql.execute;

import org.apache.derby.shared.common.sanity.SanityManager;
import org.apache.derby.iapi.sql.execute.ExecIndexRow;
import org.apache.derby.iapi.sql.execute.ExecRow;

/**
	Basic implementation of ExecIndexRow.

 */
class IndexRow extends ValueRow implements ExecIndexRow
{
	///////////////////////////////////////////////////////////////////////
	//
	//	STATE
	//
	///////////////////////////////////////////////////////////////////////


	private boolean[]	orderedNulls;

	///////////////////////////////////////////////////////////////////////
	//
	//	CONSTRUCTORS
	//
	///////////////////////////////////////////////////////////////////////

	IndexRow(int ncols) {
		 super(ncols);
		 orderedNulls = new boolean[ncols];	/* Initializes elements to false */
	}

	///////////////////////////////////////////////////////////////////////
	//
	//	EXECINDEXROW INTERFACE
	//
	///////////////////////////////////////////////////////////////////////

	/* Column positions are one-based, arrays are zero-based */
	public void orderedNulls(int columnPosition) {
		orderedNulls[columnPosition] = true;
	}

	public boolean areNullsOrdered(int columnPosition) {
		return orderedNulls[columnPosition];
	}

	/**
	 * Turn the ExecRow into an ExecIndexRow.
	 */
	public void execRowToExecIndexRow(ExecRow valueRow)
	{
		if (SanityManager.DEBUG)
		{
			SanityManager.THROWASSERT(
				"execRowToExecIndexRow() not expected to be called for IndexRow");
		}
	}

	ExecRow cloneMe() {
		return new IndexRow(nColumns());
	}
}
