se.uu.it.cs.recsys.constraint.util.ConstraintResultConverter.java Source code

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Here is the source code for se.uu.it.cs.recsys.constraint.util.ConstraintResultConverter.java

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package se.uu.it.cs.recsys.constraint.util;

/*
 * #%L
 * CourseRecommenderConstraintSolver
 * %%
 * Copyright (C) 2015 Yong Huang  <yong.e.huang@gmail.com >
 * %%
 * 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.
 * #L%
 */
import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import org.jacop.core.Domain;
import org.jacop.set.core.SetDomainValueEnumeration;
import org.jacop.set.core.SetVar;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import se.uu.it.cs.recsys.api.type.Course;
import se.uu.it.cs.recsys.api.type.CourseLevel;
import se.uu.it.cs.recsys.persistence.repository.CourseRepository;
import se.uu.it.cs.recsys.persistence.util.CourseConverter;

/**
 *
 */
@Service
public class ConstraintResultConverter {

    private static final Logger LOGGER = LoggerFactory.getLogger(ConstraintResultConverter.class);

    @Autowired
    private CourseRepository courseRepository;

    public Map<Integer, Set<Course>> convert(SetVar[] in) {
        Map<Integer, Set<Course>> result = new HashMap<>();

        if (in == null || in.length == 0) {
            LOGGER.debug("Input result is empty!");
            return result;
        }

        int i = 1;
        for (SetVar var : in) {
            LOGGER.debug("SetVar to be converted: " + var.toString());

            if (var.dom() == null || var.dom().isEmpty()) {
                LOGGER.debug("The {}th var domain is empty.", i);
                i++;
                continue;
            }

            SetDomainValueEnumeration ve = (SetDomainValueEnumeration) (var.dom().valueEnumeration());

            Set<Integer> courseIds = new HashSet<>();

            while (ve.hasMoreElements()) {
                int[] elemArray = ve.nextSetElement().toIntArray();

                for (int elem : elemArray) {
                    courseIds.add(elem);
                }
            }

            Set<se.uu.it.cs.recsys.persistence.entity.Course> courseEntities = this.courseRepository
                    .findByAutoGenIds(courseIds);

            Set<Course> courseInfoSet = courseEntities.stream().map(course -> {
                Course courseInfo = new Course.Builder().setName(course.getName())
                        .setCredit(course.getCredit().getCredit()).setCode(course.getCode())
                        .setLevel(CourseLevel.ofDBString(course.getLevel().getLevel()))
                        .setTaughtYear(Integer.valueOf(course.getTaughtYear()))
                        .setStartPeriod(Integer.valueOf(course.getStartPeriod()))
                        .setEndPeriod(Integer.valueOf(course.getEndPeriod())).build();

                return courseInfo;
            }).collect(Collectors.toSet());

            result.put(i, courseInfoSet);

            i++;
        }

        return result;
    }

    public List<Course> convert(Domain[] solution) {
        List<Course> result = new ArrayList<>();

        if (solution == null || solution.length == 0) {
            LOGGER.debug("Input result is empty!");
            return result;
        }

        for (Domain var : solution) {
            LOGGER.debug("Solution domain to be converted: " + var.toString());

            SetDomainValueEnumeration ve = (SetDomainValueEnumeration) (var.valueEnumeration());

            Set<Integer> courseIds = new HashSet<>();

            while (ve.hasMoreElements()) {
                int[] elemArray = ve.nextSetElement().toIntArray();

                for (int elem : elemArray) {
                    courseIds.add(elem);
                }
            }

            Set<se.uu.it.cs.recsys.persistence.entity.Course> courseEntities = this.courseRepository
                    .findByAutoGenIds(courseIds);

            Set<Course> courseInfoSet = courseEntities.stream().map(course -> CourseConverter.convert(course))
                    .collect(Collectors.toSet());

            result.addAll(courseInfoSet);
        }

        return result;
    }

    public Map<Integer, Set<Course>> convertToMap(Domain[] solution) {
        Map<Integer, Set<Course>> result = new HashMap<>();

        if (solution == null || solution.length == 0) {
            LOGGER.debug("Input result is empty!");
            return result;
        }

        int i = 1;
        for (Domain var : solution) {
            LOGGER.debug("Solution domain to be converted: " + var.toString());

            SetDomainValueEnumeration ve = (SetDomainValueEnumeration) (var.valueEnumeration());

            Set<Integer> courseIds = new HashSet<>();

            while (ve.hasMoreElements()) {
                int[] elemArray = ve.nextSetElement().toIntArray();

                for (int elem : elemArray) {
                    courseIds.add(elem);
                }
            }

            Set<se.uu.it.cs.recsys.persistence.entity.Course> courseEntities = this.courseRepository
                    .findByAutoGenIds(courseIds);

            Set<Course> courseInfoSet = courseEntities.stream().map(course -> {
                Course courseInfo = new Course.Builder().setName(course.getName())
                        .setCredit(course.getCredit().getCredit()).setCode(course.getCode())
                        .setLevel(CourseLevel.ofDBString(course.getLevel().getLevel()))
                        .setTaughtYear(Integer.valueOf(course.getTaughtYear()))
                        .setStartPeriod(Integer.valueOf(course.getStartPeriod()))
                        .setEndPeriod(Integer.valueOf(course.getEndPeriod())).build();

                return courseInfo;
            }).collect(Collectors.toSet());

            result.put(i, courseInfoSet);

            i++;
        }

        return result;
    }
}