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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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package org.optaplanner.examples.common.persistence;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.optaplanner.core.api.domain.solution.PlanningSolution;
import org.optaplanner.examples.common.business.SolutionBusiness;

/**
 * @param  the solution type, the class with the {@link PlanningSolution} annotation
 */
public abstract class AbstractXlsxSolutionImporter extends AbstractSolutionImporter {

    private static final String DEFAULT_INPUT_FILE_SUFFIX = "xlsx";

    @Override
    public String getInputFileSuffix() {
        return DEFAULT_INPUT_FILE_SUFFIX;
    }

    public abstract XlsxInputBuilder createXlsxInputBuilder();

    @Override
    public Solution_ readSolution(File inputFile) {
        try (InputStream in = new BufferedInputStream(new FileInputStream(inputFile))) {
            XSSFWorkbook workbook = new XSSFWorkbook(in);
            XlsxInputBuilder xlsxInputBuilder = createXlsxInputBuilder();
            xlsxInputBuilder.setInputFile(inputFile);
            xlsxInputBuilder.setWorkbook(workbook);
            try {
                Solution_ solution = xlsxInputBuilder.readSolution();
                logger.info("Imported: {}", inputFile);
                return solution;
            } catch (IllegalArgumentException | IllegalStateException e) {
                throw new IllegalArgumentException("Exception in inputFile (" + inputFile + ")", e);
            }
        } catch (IOException e) {
            throw new IllegalArgumentException("Could not read the file (" + inputFile.getName() + ").", e);
        }
    }

    public static abstract class XlsxInputBuilder extends InputBuilder {

        protected File inputFile;
        protected XSSFWorkbook workbook;

        public void setInputFile(File inputFile) {
            this.inputFile = inputFile;
        }

        public void setWorkbook(XSSFWorkbook document) {
            this.workbook = document;
        }

        public abstract Solution_ readSolution() throws IOException;

        // ************************************************************************
        // Helper methods
        // ************************************************************************

        public String getInputId() {
            return SolutionBusiness.getBaseFileName(inputFile);
        }

        protected XSSFSheet readSheet(int index, String name) {
            XSSFSheet sheet = workbook.getSheetAt(index);
            if (!sheet.getSheetName().equals(name)) {
                throw new IllegalArgumentException("The sheet (" + sheet.getSheetName() + ") at index (" + index
                        + ") is expected to have another name (" + name + ")");
            }
            return sheet;
        }

        protected void assertCellConstant(Cell cell, String constant) {
            if (!constant.equals(cell.getStringCellValue())) {
                throw new IllegalArgumentException("The cell (" + cell.getRow().getRowNum() + ","
                        + cell.getColumnIndex() + ") with value (" + cell.getStringCellValue()
                        + ") is expected to have the constant (" + constant + ")");
            }
        }

        protected long readLongCell(Cell cell) {
            double d = cell.getNumericCellValue();
            long l = (long) d;
            if (d - l != 0.0) {
                throw new IllegalArgumentException("The keyCell (" + cell.getRow().getRowNum() + ","
                        + cell.getColumnIndex() + ") with value (" + d + ") is expected to be a long.");
            }
            return l;
        }

        protected double readDoubleCell(Cell cell) {
            return cell.getNumericCellValue();
        }

        protected String readStringCell(Cell cell) {
            return cell.getStringCellValue();
        }

        protected String readStringParameter(Row row, String key) {
            Cell keyCell = row.getCell(0);
            if (!key.equals(keyCell.getStringCellValue())) {
                throw new IllegalArgumentException("The keyCell (" + keyCell.getRow().getRowNum() + ","
                        + keyCell.getColumnIndex() + ") with value (" + keyCell.getStringCellValue()
                        + ") is expected to have the key (" + key + ")");
            }
            Cell valueCell = row.getCell(1);
            return valueCell.getStringCellValue();
        }

        protected double readDoubleParameter(Row row, String key) {
            Cell keyCell = row.getCell(0);
            if (!key.equals(keyCell.getStringCellValue())) {
                throw new IllegalArgumentException("The keyCell (" + keyCell.getRow().getRowNum() + ","
                        + keyCell.getColumnIndex() + ") with value (" + keyCell.getStringCellValue()
                        + ") is expected to have the key (" + key + ")");
            }
            Cell valueCell = row.getCell(1);
            return valueCell.getNumericCellValue();
        }
    }
}