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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.taskassigning.persistence;

import java.io.File;
import java.util.function.Function;
import java.util.stream.Collectors;

import org.optaplanner.examples.common.persistence.AbstractJsonSolutionFileIO;
import org.optaplanner.examples.taskassigning.domain.Customer;
import org.optaplanner.examples.taskassigning.domain.Employee;
import org.optaplanner.examples.taskassigning.domain.TaskAssigningSolution;

public class TaskAssigningSolutionFileIO extends AbstractJsonSolutionFileIO {

    public TaskAssigningSolutionFileIO() {
        super(TaskAssigningSolution.class);
    }

    @Override
    public TaskAssigningSolution read(File inputSolutionFile) {
        TaskAssigningSolution taskAssigningSolution = super.read(inputSolutionFile);

        var customersById = taskAssigningSolution.getCustomerList().stream()
                .collect(Collectors.toMap(Customer::getId, Function.identity()));
        /*
         * Replace the duplicate customer instances in the affinityMap by references to instances from
         * the customerList.
         */
        for (Employee employee : taskAssigningSolution.getEmployeeList()) {
            var newTravelDistanceMap = deduplicateMap(employee.getAffinityMap(),
                    customersById, Customer::getId);
            employee.setAffinityMap(newTravelDistanceMap);
        }
        return taskAssigningSolution;
    }

}