/*
 *
 * 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.cassandra.db.transform;

import org.apache.cassandra.db.PartitionColumns;
import org.apache.cassandra.db.rows.BaseRowIterator;
import org.apache.cassandra.db.rows.RowIterator;
import org.apache.cassandra.db.rows.UnfilteredRowIterator;

import static org.apache.cassandra.db.transform.Transformation.add;
import static org.apache.cassandra.db.transform.Transformation.mutable;

An interface for providing new row contents for a partition.
The new contents are produced as a normal arbitrary RowIterator or UnfilteredRowIterator (as appropriate),
with matching staticRow, partitionKey and partitionLevelDeletion.
The transforming iterator invokes this method when any current source is exhausted, then then inserts the
new contents as the new source.
If the new source is itself a product of any transformations, the two transforming iterators are merged
so that control flow always occurs at the outermost point
/**
 * An interface for providing new row contents for a partition.
 *
 * The new contents are produced as a normal arbitrary RowIterator or UnfilteredRowIterator (as appropriate),
 * with matching staticRow, partitionKey and partitionLevelDeletion.
 *
 * The transforming iterator invokes this method when any current source is exhausted, then then inserts the
 * new contents as the new source.
 *
 * If the new source is itself a product of any transformations, the two transforming iterators are merged
 * so that control flow always occurs at the outermost point
 */
public interface MoreRows<I extends BaseRowIterator<?>> extends MoreContents<I>
{

    public static UnfilteredRowIterator extend(UnfilteredRowIterator iterator, MoreRows<? super UnfilteredRowIterator> more)
    {
        return add(mutable(iterator), more);
    }

    public static UnfilteredRowIterator extend(UnfilteredRowIterator iterator, MoreRows<? super UnfilteredRowIterator> more, PartitionColumns columns)
    {
        return add(Transformation.wrapIterator(iterator, columns), more);
    }

    public static RowIterator extend(RowIterator iterator, MoreRows<? super RowIterator> more)
    {
        return add(mutable(iterator), more);
    }

}