src/java/org/mxchange/jfinancials/beans/business/department/FinancialsDepartmentWebRequestBean.java

   1 /*
   2  * Copyright (C) 2017 Roland Häder
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU Affero General Public License as
   6  * published by the Free Software Foundation, either version 3 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU Affero General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Affero General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 package org.mxchange.jfinancials.beans.business.department;
  18
  19 import fish.payara.cdi.jsr107.impl.NamedCache;
  20 import java.text.MessageFormat;
  21 import java.util.Comparator;
  22 import java.util.Iterator;
  23 import java.util.LinkedList;
  24 import java.util.List;
  25 import javax.annotation.PostConstruct;
  26 import javax.cache.Cache;
  27 import javax.ejb.EJB;
  28 import javax.enterprise.context.RequestScoped;
  29 import javax.enterprise.event.Observes;
  30 import javax.inject.Inject;
  31 import javax.inject.Named;
  32 import org.mxchange.jcontactsbusiness.events.department.added.ObservableDepartmentAddedEvent;
  33 import org.mxchange.jcontactsbusiness.model.department.Department;
  34 import org.mxchange.jcontactsbusiness.model.department.DepartmentSessionBeanRemote;
  35 import org.mxchange.jfinancials.beans.BaseFinancialsBean;
  36
  37 /**
  38  * A general bean for departments
  39  * <p>
  40  * @author Roland Häder<roland@mxchange.org>
  41  */
  42 @Named ("departmentController")
  43 @RequestScoped
  44 public class FinancialsDepartmentWebRequestBean extends BaseFinancialsBean implements FinancialsDepartmentWebRequestController {
  45
  46         /**
  47          * Serial number
  48          */
  49         private static final long serialVersionUID = 5_028_697_360_461L;
  50
  51         /**
  52          * A list of all departments
  53          */
  54         private final List<Department> allDepartments;
  55
  56         /**
  57          * EJB for administrative purposes
  58          */
  59         @EJB (lookup = "java:global/jfinancials-ejb/department!org.mxchange.jcontactsbusiness.model.department.DepartmentSessionBeanRemote")
  60         private DepartmentSessionBeanRemote departmentBean;
  61
  62         /**
  63          * A list of all departments (globally)
  64          */
  65         @Inject
  66         @NamedCache (cacheName = "departmentCache")
  67         private Cache<Long, Department> departmentCache;
  68
  69         /**
  70          * A list of filtered departments
  71          */
  72         private List<Department> filteredDepartments;
  73
  74         /**
  75          * Default constructor
  76          */
  77         public FinancialsDepartmentWebRequestBean () {
  78                 // Call super constructor
  79                 super();
  80
  81                 // Init list
  82                 this.allDepartments = new LinkedList<>();
  83         }
  84
  85         /**
  86          * Observes events being fired when a department has been added.
  87          * <p>
  88          * @param event Event being fired
  89          * <p>
  90          * @throws NullPointerException If the parameter or it's carried instance is
  91          * null
  92          * @throws IllegalArgumentException If the branchId is zero or lower
  93          */
  94         public void afterDepartmentAddedEvent (@Observes final ObservableDepartmentAddedEvent event) {
  95                 // Validate parameter
  96                 if (null == event) {
  97                         // Throw NPE
  98                         throw new NullPointerException("event is null"); //NOI18N
  99                 } else if (event.getDepartment() == null) {
 100                         // Throw NPE again
 101                         throw new NullPointerException("event.department is null"); //NOI18N
 102                 } else if (event.getDepartment().getDepartmentId() == null) {
 103                         // Throw it again
 104                         throw new NullPointerException("event.department.branchId is null"); //NOI18N
 105                 } else if (event.getDepartment().getDepartmentId() < 1) {
 106                         // Throw IAE
 107                         throw new IllegalArgumentException(MessageFormat.format("event.department.branchId={0} is not valid", event.getDepartment().getDepartmentId())); //NOI18N
 108                 }
 109
 110                 // Add instance to cache
 111                 this.departmentCache.put(event.getDepartment().getDepartmentId(), event.getDepartment());
 112                 this.allDepartments.add(event.getDepartment());
 113         }
 114
 115         @Override
 116         @SuppressWarnings ("ReturnOfCollectionOrArrayField")
 117         public List<Department> allDepartments () {
 118                 return this.allDepartments;
 119         }
 120
 121         /**
 122          * Getter for a list of filtered departments
 123          * <p>
 124          * @return Filtered departments
 125          */
 126         @SuppressWarnings ("ReturnOfCollectionOrArrayField")
 127         public List<Department> getFilteredDepartments () {
 128                 return this.filteredDepartments;
 129         }
 130
 131         /**
 132          * Setter for a list of filtered departments
 133          * <p>
 134          * @param filteredDepartments Filtered departments
 135          */
 136         @SuppressWarnings ("AssignmentToCollectionOrArrayFieldFromParameter")
 137         public void setFilteredDepartments (final List<Department> filteredDepartments) {
 138                 this.filteredDepartments = filteredDepartments;
 139         }
 140
 141         /**
 142          * Initializer method
 143          */
 144         @PostConstruct
 145         public void initializeList () {
 146                 // Is cache there?
 147                 if (!this.departmentCache.iterator().hasNext()) {
 148                         // Get whole list
 149                         final List<Department> list = this.departmentBean.allDepartments();
 150
 151                         // Add all
 152                         for (final Iterator<Department> iterator = list.iterator(); iterator.hasNext();) {
 153                                 // Get next element
 154                                 final Department next = iterator.next();
 155
 156                                 // Add it to cache
 157                                 this.departmentCache.put(next.getDepartmentId(), next);
 158                         }
 159                 }
 160
 161                 // Is the list empty, but filled cache?
 162                 if (this.allDepartments.isEmpty() && this.departmentCache.iterator().hasNext()) {
 163                         // Get iterator
 164                         final Iterator<Cache.Entry<Long, Department>> iterator = this.departmentCache.iterator();
 165
 166                         // Build up list
 167                         while (iterator.hasNext()) {
 168                                 // GEt next element
 169                                 final Cache.Entry<Long, Department> next = iterator.next();
 170
 171                                 // Add to list
 172                                 this.allDepartments.add(next.getValue());
 173                         }
 174
 175                         // Sort list
 176                         this.allDepartments.sort(new Comparator<Department>() {
 177                                 @Override
 178                                 public int compare (final Department o1, final Department o2) {
 179                                         return o1.getDepartmentId() > o2.getDepartmentId() ? 1 : o1.getDepartmentId() < o2.getDepartmentId() ? -1 : 0;
 180                                 }
 181                         });
 182                 }
 183         }
 184
 185 }