src/java/org/ufcspa/simdecs/bn/ui/BayesianNetworkController.java

   1 package org.ufcspa.simdecs.bn.ui;
   2
   3 import java.io.Serializable;
   4 import java.util.ResourceBundle;
   5 import javax.annotation.Resource;
   6 import javax.faces.bean.ApplicationScoped;
   7 import javax.faces.bean.ManagedBean;
   8 import javax.faces.component.UIComponent;
   9 import javax.faces.context.FacesContext;
  10 import javax.faces.convert.Converter;
  11 import javax.faces.convert.FacesConverter;
  12 import javax.faces.model.DataModel;
  13 import javax.faces.model.ListDataModel;
  14 import javax.faces.model.SelectItem;
  15 import javax.persistence.EntityManagerFactory;
  16 import javax.persistence.PersistenceUnit;
  17 import javax.transaction.UserTransaction;
  18 import org.primefaces.event.RowEditEvent;
  19 import org.ufcspa.simdecs.bn.entity.BayesianNetwork;
  20 import org.ufcspa.simdecs.bn.jpa.BayesianNetworkJpaController;
  21 import org.ufcspa.simdecs.bn.ui.util.JsfUtil;
  22 import org.ufcspa.simdecs.bn.ui.util.PaginationHelper;
  23
  24 @ManagedBean(name = "bayesianNetworkController")
  25 @ApplicationScoped
  26 public class BayesianNetworkController implements Serializable {
  27
  28     @Resource
  29     private UserTransaction utx = null;
  30     @PersistenceUnit(unitName = "simdecsEclipseLinkPU")
  31     private EntityManagerFactory emf = null;
  32     private BayesianNetwork current;
  33     private DataModel items = null;
  34     private BayesianNetworkJpaController jpaController = null;
  35     private PaginationHelper pagination;
  36     private int selectedItemIndex;
  37
  38     public BayesianNetworkController() {
  39     }
  40
  41     public void rowEditListener(RowEditEvent event) throws Exception {
  42         BayesianNetwork bn = (BayesianNetwork) event.getObject();
  43         getJpaController().edit(bn);
  44     }
  45
  46     public BayesianNetwork getSelected() {
  47         if (current == null) {
  48             current = new BayesianNetwork();
  49             selectedItemIndex = -1;
  50         }
  51         return current;
  52     }
  53
  54     private BayesianNetworkJpaController getJpaController() {
  55         if (jpaController == null) {
  56             jpaController = new BayesianNetworkJpaController(utx, emf);
  57         }
  58         return jpaController;
  59     }
  60
  61     public PaginationHelper getPagination() {
  62         if (pagination == null) {
  63             pagination = new PaginationHelper(10) {
  64
  65                 @Override
  66                 public int getItemsCount() {
  67                     return getJpaController().getBayesianNetworkCount();
  68                 }
  69
  70                 @Override
  71                 public DataModel createPageDataModel() {
  72                     return new ListDataModel(getJpaController().findBayesianNetworkEntities(getPageSize(), getPageFirstItem()));
  73                 }
  74             };
  75         }
  76         return pagination;
  77     }
  78
  79     public String prepareList() {
  80         recreateModel();
  81         return "List";
  82     }
  83
  84     public String prepareView() {
  85         current = (BayesianNetwork) getItems().getRowData();
  86         selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
  87         return "View";
  88     }
  89
  90     public String prepareCreate() {
  91         current = new BayesianNetwork();
  92         selectedItemIndex = -1;
  93         return "Create";
  94     }
  95
  96     public String create() {
  97         try {
  98             getJpaController().create(current);
  99             JsfUtil.addSuccessMessage(ResourceBundle.getBundle("org/ufcspa/simdecs/bn/Bundle").getString("BayesianNetworkCreated"));
 100             return prepareCreate();
 101         } catch (Exception e) {
 102             JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("org/ufcspa/simdecs/bn/Bundle").getString("PersistenceErrorOccured"));
 103             return null;
 104         }
 105     }
 106
 107     public String prepareEdit() {
 108         current = (BayesianNetwork) getItems().getRowData();
 109         selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
 110         return "Edit";
 111     }
 112
 113     public String update() {
 114         try {
 115             getJpaController().edit(current);
 116             JsfUtil.addSuccessMessage(ResourceBundle.getBundle("org/ufcspa/simdecs/bn/Bundle").getString("BayesianNetworkUpdated"));
 117             return "View";
 118         } catch (Exception e) {
 119             JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("org/ufcspa/simdecs/bn/Bundle").getString("PersistenceErrorOccured"));
 120             return null;
 121         }
 122     }
 123
 124     public String destroy() {
 125         current = (BayesianNetwork) getItems().getRowData();
 126         selectedItemIndex = pagination.getPageFirstItem() + getItems().getRowIndex();
 127         performDestroy();
 128         recreatePagination();
 129         recreateModel();
 130         return "List";
 131     }
 132
 133     public String destroyAndView() {
 134         performDestroy();
 135         recreateModel();
 136         updateCurrentItem();
 137         if (selectedItemIndex >= 0) {
 138             return "View";
 139         } else {
 140             // all items were removed - go back to list
 141             recreateModel();
 142             return "List";
 143         }
 144     }
 145
 146     private void performDestroy() {
 147         try {
 148             getJpaController().destroy(current.getId());
 149             JsfUtil.addSuccessMessage(ResourceBundle.getBundle("org/ufcspa/simdecs/bn/Bundle").getString("BayesianNetworkDeleted"));
 150         } catch (Exception e) {
 151             JsfUtil.addErrorMessage(e, ResourceBundle.getBundle("org/ufcspa/simdecs/bn/Bundle").getString("PersistenceErrorOccured"));
 152         }
 153     }
 154
 155     private void updateCurrentItem() {
 156         int count = getJpaController().getBayesianNetworkCount();
 157         if (selectedItemIndex >= count) {
 158             // selected index cannot be bigger than number of items:
 159             selectedItemIndex = count - 1;
 160             // go to previous page if last page disappeared:
 161             if (pagination.getPageFirstItem() >= count) {
 162                 pagination.previousPage();
 163             }
 164         }
 165         if (selectedItemIndex >= 0) {
 166             current = getJpaController().findBayesianNetworkEntities(1, selectedItemIndex).get(0);
 167         }
 168     }
 169
 170     public DataModel getPaginatedItems() {
 171         if (items == null) {
 172             items = getPagination().createPageDataModel();
 173         }
 174         return items;
 175     }
 176
 177     public DataModel getItems() {
 178         if (items == null) {
 179             getPagination();
 180             items = new ListDataModel(getJpaController().findBayesianNetworkEntities());
 181         }
 182         return items;
 183     }
 184
 185     public void recreateModel() {
 186         items = null;
 187     }
 188
 189     private void recreatePagination() {
 190         pagination = null;
 191     }
 192
 193     public String next() {
 194         getPagination().nextPage();
 195         recreateModel();
 196         return "List";
 197     }
 198
 199     public String previous() {
 200         getPagination().previousPage();
 201         recreateModel();
 202         return "List";
 203     }
 204
 205     public SelectItem[] getItemsAvailableSelectMany() {
 206         return JsfUtil.getSelectItems(getJpaController().findBayesianNetworkEntities(), false);
 207     }
 208
 209     public SelectItem[] getItemsAvailableSelectOne() {
 210         return JsfUtil.getSelectItems(getJpaController().findBayesianNetworkEntities(), true);
 211     }
 212
 213     @FacesConverter(forClass = BayesianNetwork.class)
 214     public static class BayesianNetworkControllerConverter implements Converter {
 215
 216         public Object getAsObject(FacesContext facesContext, UIComponent component, String value) {
 217             if (value == null || value.length() == 0) {
 218                 return null;
 219             }
 220             BayesianNetworkController controller = (BayesianNetworkController) facesContext.getApplication().getELResolver().
 221                     getValue(facesContext.getELContext(), null, "bayesianNetworkController");
 222             return controller.getJpaController().findBayesianNetwork(getKey(value));
 223         }
 224
 225         java.lang.Long getKey(String value) {
 226             java.lang.Long key;
 227             key = Long.valueOf(value);
 228             return key;
 229         }
 230
 231         String getStringKey(java.lang.Long value) {
 232             StringBuffer sb = new StringBuffer();
 233             sb.append(value);
 234             return sb.toString();
 235         }
 236
 237         public String getAsString(FacesContext facesContext, UIComponent component, Object object) {
 238             if (object == null) {
 239                 return null;
 240             }
 241             if (object instanceof BayesianNetwork) {
 242                 BayesianNetwork o = (BayesianNetwork) object;
 243                 return getStringKey(o.getId());
 244             } else {
 245                 throw new IllegalArgumentException("object " + object + " is of type " + object.getClass().getName() + "; expected type: " + BayesianNetworkController.class.getName());
 246             }
 247         }
 248     }
 249 }