/*
 * Copyright 2010 JBoss Inc
 *
 * 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.
 */

package org.drools.planner.examples.nurserostering.domain.solver;

import java.util.Comparator;

import org.apache.commons.lang.builder.CompareToBuilder;
import org.drools.planner.examples.nurserostering.domain.ShiftAssignment;
import org.drools.planner.examples.nurserostering.domain.Shift;

public class ShiftAssignmentDifficultyComparator implements Comparator<Object> {

    public int compare(Object a, Object b) {
        return compare((ShiftAssignment) a, (ShiftAssignment) b);
    }

    public int compare(ShiftAssignment a, ShiftAssignment b) {
        Shift aShift = a.getShift();
        Shift bShift = b.getShift();
        return new CompareToBuilder()
                    .append(bShift.getShiftDate(), aShift.getShiftDate()) // Descending
                    .append(aShift.getRequiredEmployeeSize(), bShift.getRequiredEmployeeSize())
                    .append(bShift.getShiftType(), aShift.getShiftType()) // Descending
                    .toComparison();
    }

}

@@ -1372,17 +1372,17 @@
 .append(
-a
+b
 Shift.ge
@@ -1386,33 +1386,22 @@
 .get
-RequiredEmployeeSiz
+ShiftTyp
 e(), 
-b
+a
 Shif
@@ -1409,31 +1409,130 @@
 .get
-RequiredEmployeeSize())
+ShiftType()) // Descending%0A                    // For construction heuristics, scheduling the shifts in sequence is better
 %0A   
@@ -1548,33 +1548,33 @@
         .append(
-b
+a
 Shift.getShiftTy
@@ -1562,38 +1562,49 @@
 d(aShift.get
-ShiftTyp
+RequiredEmployeeSiz
 e(), 
-a
+b
 Shift.getShi
@@ -1604,34 +1604,31 @@
 .get
-ShiftType()) // Descending
+RequiredEmployeeSize())
 %0A   

fix difficulty bug