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

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Here is the source code for org.sakaiproject.gradebookng.business.AssignmentGradeComparator.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.Comparator;

import org.apache.commons.lang3.builder.CompareToBuilder;
import org.apache.commons.lang3.math.NumberUtils;
import org.sakaiproject.gradebookng.business.model.GbGradeInfo;
import org.sakaiproject.gradebookng.business.model.GbStudentGradeInfo;

/**
 * Comparator class for sorting an assignment by the grades.
 *
 * Note that this must have the assignmentId set into it so we can extract the appropriate grade entry from the map that each student has.
 *
 */
public class AssignmentGradeComparator implements Comparator<GbStudentGradeInfo> {

    private final long assignmentId;

    public AssignmentGradeComparator(final long assignmentId) {
        this.assignmentId = assignmentId;
    }

    @Override
    public int compare(final GbStudentGradeInfo g1, final GbStudentGradeInfo g2) {

        final GbGradeInfo info1 = g1.getGrades().get(this.assignmentId);
        final GbGradeInfo info2 = g2.getGrades().get(this.assignmentId);

        // for proper number ordering, these have to be numerical
        final Double grade1 = (info1 != null) ? NumberUtils.toDouble(info1.getGrade()) : null;
        final Double grade2 = (info2 != null) ? NumberUtils.toDouble(info2.getGrade()) : null;

        return new CompareToBuilder().append(grade1, grade2).toComparison();

    }

}