extensions/quarkus/showcase/src/main/java/org/apache/myfaces/core/extensions/quarkus/showcase/view/LazySorter.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package org.apache.myfaces.core.extensions.quarkus.showcase.view;

import java.util.Comparator;
import org.primefaces.model.SortOrder;

import static org.apache.commons.lang3.StringUtils.capitalize;

public class LazySorter implements Comparator<Car> {
 
    private String sortField;
    private SortOrder sortOrder;
     
    public LazySorter(String sortField, SortOrder sortOrder) {
        this.sortField = sortField;
        this.sortOrder = sortOrder;
    }
 
    @Override
    public int compare(Car car1, Car car2) {
        try {
            Object value1 = Car.class.getMethod("get"+capitalize(this.sortField)).invoke(car1);
            Object value2 = Car.class.getMethod("get"+capitalize(this.sortField)).invoke(car2);
 
            int value = ((Comparable) value1).compareTo(value2);
             
            return SortOrder.ASCENDING.equals(sortOrder) ? value : -1 * value;
        } 
        catch(Exception e) {
            throw new RuntimeException(e);
        }
    }
}