/**
* DataCleaner (community edition)
* Copyright (C) 2014 Neopost - Customer Information Management
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* 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 Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.datacleaner.data;
import java.util.List;
import org.apache.metamodel.DataContext;
import org.apache.metamodel.MetaModelException;
import org.apache.metamodel.QueryPostprocessDataContext;
import org.apache.metamodel.data.DataSet;
import org.apache.metamodel.data.EmptyDataSet;
import org.apache.metamodel.query.FilterItem;
import org.apache.metamodel.schema.AbstractSchema;
import org.apache.metamodel.schema.Column;
import org.apache.metamodel.schema.Schema;
import org.apache.metamodel.schema.Table;
import org.datacleaner.api.OutputDataStream;
/**
* A virtual {@link DataContext} that represents/wraps a
* {@link OutputDataStream}.
*/
public class OutputDataStreamDataContext extends QueryPostprocessDataContext {
private final OutputDataStream _outputDataStream;
public OutputDataStreamDataContext(final OutputDataStream outputDataStream) {
_outputDataStream = outputDataStream;
}
@Override
protected Schema getMainSchema() throws MetaModelException {
return new AbstractSchema() {
private static final long serialVersionUID = 1L;
@Override
public String getQuote() {
return null;
}
@Override
public Table[] getTables() {
return new Table[] { _outputDataStream.getTable() };
}
@Override
public String getName() {
return null;
}
};
}
@Override
protected String getMainSchemaName() throws MetaModelException {
return _outputDataStream.getName();
}
@Override
protected DataSet materializeMainSchemaTable(final Table table, final Column[] columns, final int maxRows) {
return new EmptyDataSet(columns);
}
@Override
protected Number executeCountQuery(final Table table, final List<FilterItem> whereItems,
final boolean functionApproximationAllowed) {
return -1;
}
}