/**
* Copyright (C) 2009-2013 FoundationDB, LLC
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.foundationdb.qp.memoryadapter;
import com.foundationdb.ais.model.TableName;
import com.foundationdb.qp.row.ValuesRow;
import com.foundationdb.qp.row.Row;
import com.foundationdb.qp.rowtype.RowType;
import java.util.Iterator;
public abstract class SimpleMemoryGroupScan<T> implements MemoryGroupCursor.GroupScan {
protected abstract Object[] createRow(T data, int hiddenPk);
@Override
public Row next() {
if (!iterator.hasNext())
return null;
Object[] rowContents = createRow(iterator.next(), ++hiddenPk);
return new ValuesRow(rowType, rowContents);
}
@Override
public void close() {
// nothing
}
public SimpleMemoryGroupScan(MemoryAdapter adapter, TableName tableName, Iterator<? extends T> iterator) {
this.iterator = iterator;
this.rowType = adapter.schema().tableRowType(adapter.schema().ais().getTable(tableName));
}
private final Iterator<? extends T> iterator;
private final RowType rowType;
private int hiddenPk = 0;
}