/**
* 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.metamodel.data;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import org.apache.metamodel.query.SelectItem;
import org.apache.metamodel.util.EqualsBuilder;
/**
* {@link TableModel} implementation which wraps a {@link DataSet} and presents its data.
*
* @since 3.0
*/
public class DataSetTableModel extends AbstractTableModel {
private static final long serialVersionUID = 267644807447629777L;
private boolean _materialized;
private final List<Row> _materializedRows = new ArrayList<Row>();
private final DataSet _dataSet;
private final SelectItem[] _selectItems;
public DataSetTableModel(DataSet dataSet) {
_dataSet = dataSet;
_selectItems = dataSet.getSelectItems();
_materialized = false;
}
@Override
public int hashCode() {
return Arrays.hashCode(_selectItems) + _materializedRows.hashCode();
}
@Override
public boolean equals(Object obj) {
if (obj == null) {
return false;
}
if (obj == this) {
return true;
}
if (getClass() == obj.getClass()) {
DataSetTableModel that = (DataSetTableModel) obj;
EqualsBuilder eb = new EqualsBuilder();
eb.append(_materializedRows, that._materializedRows);
eb.append(_selectItems, that._selectItems);
return eb.isEquals();
}
return false;
}
public int getColumnCount() {
return _selectItems.length;
}
public int getRowCount() {
materialize();
return _materializedRows.size();
}
private void materialize() {
if (!_materialized) {
try {
while (_dataSet.next()) {
_materializedRows.add(_dataSet.getRow());
}
} finally {
_dataSet.close();
}
_materialized = true;
}
}
public Object getValueAt(int rowIndex, int columnIndex) {
materialize();
return _materializedRows.get(rowIndex).getValue(columnIndex);
}
@Override
public String getColumnName(int column) {
return _selectItems[column].getSuperQueryAlias(false);
}
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
throw new UnsupportedOperationException(
"DataSetTableModels are immutable, so setValueAt() method is unsupported.");
}
}