tds.tdsadmin.model.LazySorter.java Source code

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Here is the source code for tds.tdsadmin.model.LazySorter.java

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/*******************************************************************************
 * Educational Online Test Delivery System
 * Copyright (c) 2016 American Institutes for Research
 * 
 * Distributed under the AIR Open Source License, Version 1.0
 * See accompanying file AIR-License-1_0.txt or at 
 * http://www.smarterapp.org/documents/American_Institutes_for_Research_Open_Source_Software_License.pdf
 ******************************************************************************/
package tds.tdsadmin.model;

import java.util.Comparator;
import java.util.Date;

import org.primefaces.model.SortOrder;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.util.FieldUtils;

public class LazySorter implements Comparator<TestOpportunity> {

    private static final Logger _logger = LoggerFactory.getLogger(LazySorter.class);

    private String sortField;

    private SortOrder sortOrder;

    public LazySorter(String sortField, SortOrder sortOrder) {
        this.sortField = sortField;
        this.sortOrder = sortOrder;
    }

    public int compare(TestOpportunity testOpportunity1, TestOpportunity testOpportunity2) {
        try {

            Object value1 = FieldUtils.getFieldValue(testOpportunity1, sortField);
            Object value2 = FieldUtils.getFieldValue(testOpportunity2, sortField);

            int value;
            if (value1 == null && value2 == null)
                value = 0;
            else if (value1 == null)
                value = -1;
            else if (value2 == null)
                value = 1;
            else
                value = ((Comparable) value1).compareTo(value2);

            return SortOrder.ASCENDING.equals(sortOrder) ? value : -1 * value;
        } catch (Exception e) {
            _logger.error(e.getMessage(), e);
            throw new RuntimeException();
        }
    }
}