tech.tablesaw.table.SelectionTableSliceGroup Maven / Gradle / Ivy

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/*
 * 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 tech.tablesaw.table;

import tech.tablesaw.api.Table;
import tech.tablesaw.selection.BitmapBackedSelection;
import tech.tablesaw.selection.Selection;

import java.util.ArrayList;
import java.util.List;

/**
 * A group of tables formed by performing splitting operations on an original table
 */
public class SelectionTableSliceGroup extends TableSliceGroup {

    public static SelectionTableSliceGroup create(Table original, String subTableNameTemplate, int step) {
        return new SelectionTableSliceGroup(original, subTableNameTemplate, step);
    }

    private SelectionTableSliceGroup(Table original, String subTableNameTemplate, int step) {
        super(original);
        List selections = new ArrayList<>();
        for (int i = 0; i < original.rowCount() - step; i += step) {
            Selection selection = new BitmapBackedSelection();
            selection.addRange(i, i + step);
            selections.add(selection);
        }
        splitOnSelection(subTableNameTemplate, selections);
    }

    private void splitOnSelection(String nameTemplate, List selections) {
        for (int i = 0; i < selections.size(); i++) {
            TableSlice view = new TableSlice(getSourceTable(), selections.get(i));
            String name = nameTemplate + ": " + i + 1;
            view.setName(name);
            getSlices().add(view);
        }
    }
}