/**
* Copyright (C) 2014 JBoss Inc
*
* Licensed 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.dashbuilder.dataset.engine.sort;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import javax.enterprise.context.ApplicationScoped;
import org.dashbuilder.dataset.engine.DataSetHandler;
import org.dashbuilder.dataset.DataColumn;
import org.dashbuilder.dataset.DataSet;
import org.dashbuilder.dataset.sort.ColumnSort;
/**
* A basic sort algorithm takes relies on the default <tt>Collections.sort()</tt> implementation.
*/
@ApplicationScoped
public class CollectionsDataSetSort implements DataSetSortAlgorithm {
public List<Integer> sort(DataSetHandler ctx, List<ColumnSort> columnSortList) {
DataSet dataSet = ctx.getDataSet();
// Create the comparator.
DataSetRowComparator comparator = new DataSetRowComparator();
for (ColumnSort columnSort : columnSortList) {
DataColumn column = dataSet.getColumnById(columnSort.getColumnId());
if (column == null) throw new IllegalArgumentException("Column not found in data set: " + columnSort.getColumnId());
comparator.criteria(column, columnSort.getOrder());
}
// Create the row number list to sort.
List<Integer> rows = new ArrayList<Integer>();
if (ctx != null && ctx.getRows() != null) {
rows.addAll(ctx.getRows());
} else {
for (int i=0; i<dataSet.getRowCount(); i++) {
rows.add(i);
}
}
// Sort the row numbers.
Collections.sort(rows, comparator);
return rows;
}
}