eu.etaxonomy.taxeditor.store/src/main/java/eu/etaxonomy/taxeditor/ui/element/AbstractCdmFormElement.java

   1 /**
   2  *
   3  */
   4 package eu.etaxonomy.taxeditor.ui.element;
   5
   6 import java.util.ConcurrentModificationException;
   7 import java.util.HashSet;
   8 import java.util.List;
   9 import java.util.Set;
  10
  11 import org.eclipse.core.runtime.Assert;
  12 import org.eclipse.jface.util.IPropertyChangeListener;
  13 import org.eclipse.jface.util.PropertyChangeEvent;
  14 import org.eclipse.swt.graphics.Color;
  15 import org.eclipse.swt.widgets.Composite;
  16 import org.eclipse.swt.widgets.Control;
  17 import org.eclipse.ui.forms.widgets.Section;
  18
  19 import eu.etaxonomy.taxeditor.model.AbstractUtility;
  20 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  21
  22 /**
  23  * <p>Abstract AbstractCdmFormElement class.</p>
  24  *
  25  * @author n.hoffmann
  26  * @version $Id: $
  27  */
  28 public abstract class AbstractCdmFormElement implements ICdmFormElement {
  29
  30         protected CdmFormFactory formFactory;
  31
  32         private List<IPropertyChangeListener> propertyChangeListeners;
  33
  34         private Composite layoutComposite;
  35
  36         private final Set<Control> controls = new HashSet<Control>();
  37
  38         private final Set<ICdmFormElement> elements = new HashSet<ICdmFormElement>();
  39         private ICdmFormElement parentElement;
  40
  41         private Color persistentBackgroundColor;
  42
  43
  44         /**
  45          * <p>Constructor for AbstractCdmFormElement.</p>
  46          *
  47          * @param formFactory a {@link eu.etaxonomy.taxeditor.ui.element.CdmFormFactory} object.
  48          * @param layoutComposite a {@link org.eclipse.swt.widgets.Composite} object.
  49          */
  50         protected AbstractCdmFormElement(CdmFormFactory formFactory, Composite layoutComposite){
  51                 this.layoutComposite = layoutComposite;
  52                 this.formFactory = formFactory;
  53         }
  54
  55         /**
  56          * <p>Constructor for AbstractCdmFormElement.</p>
  57          *
  58          * @param formFactory a {@link eu.etaxonomy.taxeditor.ui.element.CdmFormFactory} object.
  59          * @param formElement a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement} object.
  60          */
  61         public AbstractCdmFormElement(CdmFormFactory formFactory, ICdmFormElement formElement) {
  62                 this(formFactory, formElement.getLayoutComposite());
  63                 this.parentElement = formElement;
  64 //              addControl(layoutComposite);
  65         }
  66
  67         @Override
  68     public CdmFormFactory getFormFactory() {
  69                 return formFactory;
  70         }
  71
  72         /**
  73          * Delegates the focus to <code>this</code> elements main input control
  74          */
  75         public void setFocus(){
  76                 // Override in subclasses where needed
  77         }
  78
  79         /**
  80          * Returns all Controls that are managed by this element
  81          *
  82          * @return a {@link java.util.Set} object.
  83          */
  84         @Override
  85     public Set<Control> getControls(){
  86                 return controls;
  87         }
  88
  89         /**
  90          * adds the control to the set of controls that are managed by this element
  91          *
  92          * @param child a {@link org.eclipse.swt.widgets.Control} object.
  93          */
  94         protected void addControl(Control child){
  95                 controls.add(child);
  96         }
  97
  98         /**
  99          * <p>removeControl</p>
 100          *
 101          * @param child a {@link org.eclipse.swt.widgets.Control} object.
 102          */
 103         protected void removeControl(Control child){
 104                 controls.remove(child);
 105         }
 106
 107         /**
 108          * <p>Getter for the field <code>elements</code>.</p>
 109          *
 110          * @return a {@link java.util.Set} object.
 111          */
 112         @Override
 113     public Set<ICdmFormElement> getElements(){
 114                 return elements;
 115         }
 116
 117         /**
 118          * <p>Getter for the field <code>parentElement</code>.</p>
 119          *
 120          * @return a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement} object.
 121          */
 122         @Override
 123     public ICdmFormElement getParentElement(){
 124                 return parentElement;
 125         }
 126
 127         /** {@inheritDoc} */
 128         @Override
 129     public void addElement(ICdmFormElement element){
 130                 elements.add(element);
 131         }
 132
 133         /**
 134          * <p>removeElement</p>
 135          *
 136          * @param element a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement} object.
 137          */
 138         protected void removeElement(ICdmFormElement element){
 139                 elements.remove(element);
 140         }
 141
 142         /**
 143          * Remove all child {@link ICdmFormElement}s and child {@link Control}s
 144          * of the given and the element itself.
 145          * @param formElement The element to remove
 146          */
 147         public void removeElementsAndControls(ICdmFormElement formElement){
 148             for(ICdmFormElement childElement : formElement.getElements()){
 149                 // recursion
 150                 childElement.removeElements();
 151
 152                 // unregister selection arbitrator
 153                 if(childElement instanceof ISelectableElement){
 154                     SelectionArbitrator selectionArbitrator = ((ISelectableElement) childElement).getSelectionArbitrator();
 155                     if(selectionArbitrator != null){
 156                         formFactory.destroySelectionArbitrator(selectionArbitrator);
 157                     }
 158                 }
 159
 160                 // unregister from property changes
 161                 formFactory.removePropertyChangeListener(childElement);
 162
 163                 // dispose of the controls
 164                 removeControls(childElement);
 165             }
 166             removeControls(formElement);
 167         }
 168
 169         /**
 170          * Removes all child {@link ICdmFormElement}s and child {@link Control}s
 171          * and the element itself.
 172          */
 173         @Override
 174     public void removeElements(){
 175                 for(ICdmFormElement childElement : getElements()){
 176                         // recursion
 177                         childElement.removeElements();
 178
 179                         // unregister selection arbitrator
 180                         if(childElement instanceof ISelectableElement){
 181                                 SelectionArbitrator selectionArbitrator = ((ISelectableElement) childElement).getSelectionArbitrator();
 182                                 if(selectionArbitrator != null){
 183                                         formFactory.destroySelectionArbitrator(selectionArbitrator);
 184                                 }
 185                         }
 186
 187                         // unregister from property changes
 188                         formFactory.removePropertyChangeListener(childElement);
 189
 190                         // dispose of the controls
 191                         removeControls(childElement);
 192                 }
 193                 removeControls(this);
 194                 elements.clear();
 195         }
 196
 197         private void removeControls(ICdmFormElement element){
 198                 if(element instanceof Section){
 199                         ((Section) element).dispose();
 200                         element = null;
 201                 }else{
 202                         for(Control control : element.getControls()){
 203                                 // we added the layoutComposite of the parental element as the layout composite to this formElement
 204                                 // but we do not want to destroy it.
 205                                 if(control.equals(element.getLayoutComposite())){
 206                                         continue;
 207                                 }else{
 208                                         control.dispose();
 209                                         control = null;
 210                                 }
 211                         }
 212                 }
 213         }
 214
 215         /**
 216          * <p>Getter for the field <code>layoutComposite</code>.</p>
 217          *
 218          * @return a {@link org.eclipse.swt.widgets.Composite} object.
 219          */
 220         @Override
 221     public Composite getLayoutComposite() {
 222                 return layoutComposite;
 223         }
 224
 225         /**
 226          * <p>Setter for the field <code>layoutComposite</code>.</p>
 227          *
 228          * @param layoutComposite a {@link org.eclipse.swt.widgets.Composite} object.
 229          */
 230         public void setLayoutComposite(Composite layoutComposite){
 231                 this.layoutComposite = layoutComposite;
 232         }
 233
 234         /* (non-Javadoc)
 235          * @see eu.etaxonomy.taxeditor.forms.ICdmFormComposite#getPropertyChangeListeners()
 236          */
 237         /**
 238          * <p>Getter for the field <code>propertyChangeListeners</code>.</p>
 239          *
 240          * @return a {@link java.util.Set} object.
 241          */
 242         @Override
 243     public List<IPropertyChangeListener> getPropertyChangeListeners() {
 244                 return propertyChangeListeners;
 245         }
 246
 247         /* (non-Javadoc)
 248          * @see eu.etaxonomy.taxeditor.forms.ICdmFormComposite#setPropertyChangeListeners(org.eclipse.core.runtime.ListenerList)
 249          */
 250         /** {@inheritDoc} */
 251         @Override
 252     public void setPropertyChangeListeners(List<IPropertyChangeListener> propertyChangeListeners){
 253                 this.propertyChangeListeners = propertyChangeListeners;
 254         }
 255
 256         /* (non-Javadoc)
 257          * @see eu.etaxonomy.taxeditor.forms.IPropertyChangeEmitter#firePropertyChangeEvent()
 258          */
 259         /* (non-Javadoc)
 260          * @see eu.etaxonomy.taxeditor.forms.ICdmFormComposite#firePropertyChangeEvent(org.eclipse.jface.util.PropertyChangeEvent)
 261          */
 262         /** {@inheritDoc} */
 263         @Override
 264     public void firePropertyChangeEvent(CdmPropertyChangeEvent event) {
 265             //TODO: replace propertyChangeListeners with formFactory.getPropertyChangeListeners() and remove member propertyChangeListeners from AbstractCdmFormElement
 266                 Assert.isNotNull(propertyChangeListeners, "Property change listeners are not present");
 267
 268                 try{
 269                         for(Object listener : propertyChangeListeners){
 270                                 ((IPropertyChangeListener)listener).propertyChange(event);
 271                         }
 272                 }catch(ConcurrentModificationException e){
 273                         // There are two cases that produce a CME.
 274                         // Described here: http://dev.e-taxonomy.eu/trac/ticket/2363#comment:2
 275                         // and here: http://dev.e-taxonomy.eu/trac/ticket/2438
 276                         // Ignoring the CME because nothing bad is happening
 277                         MessagingUtils.warn(getClass(), "ConcurrentModificationException. Can be ignored.");
 278                 }
 279         }
 280
 281         /**
 282          * Fires a {@link CdmPropertyChangeEvent} with the given object as source.
 283          *
 284          * @param object the object on which the property changed
 285          */
 286         public void firePropertyChangeEvent(Object object){
 287                 firePropertyChangeEvent(object, null);
 288         }
 289
 290         /**
 291          * Fires a {@link CdmPropertyChangeEvent} with the given object as source also containing the
 292          * originating event
 293          *
 294          * @param object the object on which the property changed
 295          * @param originatingEvent the originating event
 296          */
 297         public void firePropertyChangeEvent(Object object, PropertyChangeEvent originatingEvent){
 298                 firePropertyChangeEvent(new CdmPropertyChangeEvent(object, originatingEvent));
 299         }
 300
 301
 302         /**
 303          * {@inheritDoc}
 304          *
 305          * This method gets called whenever the toolkit this composite was created with gets a property change notification.
 306          *
 307          * It is good advice to check whether the PropertyChangeEvent is destined for the implementing composite.
 308          * Implementations should also check for null PropertyChangeEvents and return immediately in that case.
 309          * @see eu.etaxonomy.taxeditor.ui.element.ICdmFormElement#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
 310          */
 311         @Override
 312     public void propertyChange(PropertyChangeEvent event) {
 313                 // implement in subclasses
 314         }
 315
 316         /** {@inheritDoc} */
 317         @Override
 318     public boolean containsFormElement(ICdmFormElement formElement){
 319                 if(formElement == this){
 320                         return true;
 321                 }else{
 322                         for(ICdmFormElement element : getElements()){
 323                                 boolean contains = element.containsFormElement(formElement);
 324                                 if(contains == true){
 325                                         return true;
 326                                 }
 327                         }
 328                         return false;
 329                 }
 330         }
 331
 332         /*
 333          * (non-Javadoc)
 334          * @see eu.etaxonomy.taxeditor.forms.ICdmFormElement#refresh()
 335          */
 336         /**
 337          * <p>refresh</p>
 338          */
 339         @Override
 340     public void refresh() {
 341                 // empty default implementation
 342         }
 343
 344
 345         /** {@inheritDoc} */
 346         @Override
 347         public void setBackground(Color color) {
 348                 for(ICdmFormElement element : getElements()){
 349                         element.setBackground(color);
 350                 }
 351         }
 352
 353         @Override
 354         public void setPersistentBackground(Color color) {
 355                 persistentBackgroundColor = color;
 356                 setBackground(color);
 357         }
 358
 359         @Override
 360         public Color getPersistentBackground() {
 361                 return persistentBackgroundColor;
 362         }
 363
 364         public Color getColor(String colorId){
 365                 return AbstractUtility.getColor(colorId);
 366         }
 367 }