org.sakaiproject.gradebookng.business.CourseGradeComparator.java Source code

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Here is the source code for org.sakaiproject.gradebookng.business.CourseGradeComparator.java

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/**
 * Copyright (c) 2003-2017 The Apereo Foundation
 *
 * Licensed under the Educational Community 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://opensource.org/licenses/ecl2
 *
 * 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.sakaiproject.gradebookng.business;

import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang3.builder.CompareToBuilder;
import org.sakaiproject.gradebookng.business.model.GbStudentGradeInfo;
import org.sakaiproject.service.gradebook.shared.CourseGrade;
import org.sakaiproject.service.gradebook.shared.GradebookInformation;

/**
 * Comparator class for sorting by course grade, first by the letter grade's index in the gradebook's grading scale and then by the number
 * of points the student has earned.
 */
public class CourseGradeComparator implements Comparator<GbStudentGradeInfo> {

    private List<String> ascendingGrades;

    public CourseGradeComparator(final GradebookInformation gradebookInformation) {
        final Map<String, Double> gradeMap = gradebookInformation.getSelectedGradingScaleBottomPercents();
        this.ascendingGrades = new ArrayList<>(gradeMap.keySet());
        this.ascendingGrades.sort(new Comparator<String>() {
            @Override
            public int compare(final String a, final String b) {
                return new CompareToBuilder().append(gradeMap.get(a), gradeMap.get(b)).toComparison();
            }
        });
    }

    @Override
    public int compare(final GbStudentGradeInfo g1, final GbStudentGradeInfo g2) {
        final CourseGrade cg1 = g1.getCourseGrade().getCourseGrade();
        final CourseGrade cg2 = g2.getCourseGrade().getCourseGrade();

        String letterGrade1 = cg1.getMappedGrade();
        if (cg1.getEnteredGrade() != null) {
            letterGrade1 = cg1.getEnteredGrade();
        }
        String letterGrade2 = cg2.getMappedGrade();
        if (cg2.getEnteredGrade() != null) {
            letterGrade2 = cg2.getEnteredGrade();
        }

        final int gradeIndex1 = this.ascendingGrades.indexOf(letterGrade1);
        final int gradeIndex2 = this.ascendingGrades.indexOf(letterGrade2);

        final Double calculatedGrade1 = cg1.getCalculatedGrade() == null ? null
                : Double.valueOf(cg1.getCalculatedGrade());
        final Double calculatedGrade2 = cg2.getCalculatedGrade() == null ? null
                : Double.valueOf(cg2.getCalculatedGrade());

        return new CompareToBuilder().append(gradeIndex1, gradeIndex2).append(calculatedGrade1, calculatedGrade2)
                .toComparison();
    }

}