EDIT

/**

 *

 */

package eu.etaxonomy.taxeditor.ui.element;

import java.util.ConcurrentModificationException;

import java.util.HashSet;

import java.util.Iterator;

import java.util.List;

import java.util.Set;

import org.eclipse.core.runtime.Assert;

import org.eclipse.jface.util.IPropertyChangeListener;

import org.eclipse.jface.util.PropertyChangeEvent;

import org.eclipse.swt.graphics.Color;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.ui.forms.widgets.Section;

import eu.etaxonomy.taxeditor.model.AbstractUtility;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

/**

 * @author n.hoffmann

 * @version $Id: $

 */

public abstract class AbstractCdmFormElement implements ICdmFormElement {

	protected CdmFormFactory formFactory;

	private List<IPropertyChangeListener> propertyChangeListeners;

	private Composite layoutComposite;

	private final Set<Control> controls = new HashSet<Control>();

	private final Set<ICdmFormElement> elements = new HashSet<ICdmFormElement>();

	private ICdmFormElement parentElement;

	private Color persistentBackgroundColor;

	protected AbstractCdmFormElement(CdmFormFactory formFactory, Composite layoutComposite){

		this.layoutComposite = layoutComposite;

		this.formFactory = formFactory;

	}

	public AbstractCdmFormElement(CdmFormFactory formFactory, ICdmFormElement formElement) {

		this(formFactory, formElement.getLayoutComposite());

		this.parentElement = formElement;

//		addControl(layoutComposite);

	}

	@Override

    public CdmFormFactory getFormFactory() {

		return formFactory;

	}

	/**

	 * Delegates the focus to <code>this</code> elements main input control

	 */

	public void setFocus(){

		// Override in subclasses where needed

	}

	/**

	 * Returns all Controls that are managed by this element

	 *

	 * @return a {@link java.util.Set} object.

	 */

	@Override

    public Set<Control> getControls(){

		return controls;

	}

	/**

	 * adds the control to the set of controls that are managed by this element

	 *

	 * @param child a {@link org.eclipse.swt.widgets.Control} object.

	 */

	protected void addControl(Control child){

		controls.add(child);

	}

	protected void removeControl(Control child){

		controls.remove(child);

	}

	/**

	 * <p>Getter for the field <code>elements</code>.</p>

	 *

	 * @return a {@link java.util.Set} object.

	 */

	@Override

    public Set<ICdmFormElement> getElements(){

		return elements;

	}

	/**

	 * <p>Getter for the field <code>parentElement</code>.</p>

	 *

	 * @return a {@link eu.etaxonomy.taxeditor.ui.element.ICdmFormElement} object.

	 */

	@Override

    public ICdmFormElement getParentElement(){

		return parentElement;

	}

	/** {@inheritDoc} */

	@Override

    public void addElement(ICdmFormElement element){

		elements.add(element);

	}

	/**

	 * Remove all child {@link ICdmFormElement}s and child {@link Control}s

	 * of the given and the element itself.

	 * @param formElement The element to remove

	 */

	public void removeElementsAndControls(ICdmFormElement formElement){

	    for(ICdmFormElement childElement : formElement.getElements()){

	        // recursion

	        childElement.removeElements();

	        // unregister selection arbitrator

	        if(childElement instanceof ISelectableElement){

	            SelectionArbitrator selectionArbitrator = ((ISelectableElement) childElement).getSelectionArbitrator();

	            if(selectionArbitrator != null){

	                formFactory.destroySelectionArbitrator(selectionArbitrator);

	            }

	        }

	        // unregister from property changes

	        formFactory.removePropertyChangeListener(childElement);

	        // dispose of the controls

	        removeControls(childElement);

	    }

	    removeControls(formElement);

	    this.elements.remove(formElement);

	}

	/**

	 * Removes all child {@link ICdmFormElement}s and child {@link Control}s

	 * and the element itself.

	 */

	@Override

    public void removeElements(){

        for (Iterator<ICdmFormElement> iterator = getElements().iterator();iterator.hasNext();) {

            ICdmFormElement childElement = iterator.next();

			// recursion

			childElement.removeElements();

			// unregister selection arbitrator

			if(childElement instanceof ISelectableElement){

				SelectionArbitrator selectionArbitrator = ((ISelectableElement) childElement).getSelectionArbitrator();

				if(selectionArbitrator != null){

					formFactory.destroySelectionArbitrator(selectionArbitrator);

				}

			}

			// unregister from property changes

			formFactory.removePropertyChangeListener(childElement);

			// dispose of the controls

			removeControls(childElement);

		}

		if(this instanceof ISelectableElement){

            SelectionArbitrator selectionArbitrator = ((ISelectableElement) this).getSelectionArbitrator();

            if(selectionArbitrator != null){

                formFactory.destroySelectionArbitrator(selectionArbitrator);

            }

        }

		removeControls(this);

		elements.clear();

	}

	private void removeControls(ICdmFormElement element){

		if(element instanceof Section){

			((Section) element).dispose();

			element = null;

		}else{

			for(Control control : element.getControls()){

				// we added the layoutComposite of the parental element as the layout composite to this formElement

				// but we do not want to destroy it.

				if(control.equals(element.getLayoutComposite())){

					continue;

				}else{

					control.dispose();

					control = null;

				}

			}

		}

	}

	/**

	 * <p>Getter for the field <code>layoutComposite</code>.</p>

	 *

	 * @return a {@link org.eclipse.swt.widgets.Composite} object.

	 */

	@Override

    public Composite getLayoutComposite() {

		return layoutComposite;

	}

	/**

	 * <p>Setter for the field <code>layoutComposite</code>.</p>

	 *

	 * @param layoutComposite a {@link org.eclipse.swt.widgets.Composite} object.

	 */

	public void setLayoutComposite(Composite layoutComposite){

		this.layoutComposite = layoutComposite;

	}

	/**

	 * <p>Getter for the field <code>propertyChangeListeners</code>.</p>

	 *

	 * @return a {@link java.util.Set} object.

	 */

	@Override

    public List<IPropertyChangeListener> getPropertyChangeListeners() {

		return propertyChangeListeners;

	}

	/** {@inheritDoc} */

	@Override

    public void setPropertyChangeListeners(List<IPropertyChangeListener> propertyChangeListeners){

		this.propertyChangeListeners = propertyChangeListeners;

	}

	/** {@inheritDoc} */

	@Override

    public void firePropertyChangeEvent(CdmPropertyChangeEvent event) {

	    //TODO: replace propertyChangeListeners with formFactory.getPropertyChangeListeners() and remove member propertyChangeListeners from AbstractCdmFormElement

		Assert.isNotNull(propertyChangeListeners, "Property change listeners are not present");

		try{

			for(Object listener : propertyChangeListeners){

				((IPropertyChangeListener)listener).propertyChange(event);

			}

		}catch(ConcurrentModificationException e){

			// There are two cases that produce a CME.

			// Described here: http://dev.e-taxonomy.eu/trac/ticket/2363#comment:2

			// and here: http://dev.e-taxonomy.eu/trac/ticket/2438

			// Ignoring the CME because nothing bad is happening

			MessagingUtils.warn(getClass(), "ConcurrentModificationException. Can be ignored.");

		}

	}

	/**

	 * Fires a {@link CdmPropertyChangeEvent} with the given object as source.

	 *

	 * @param object the object on which the property changed

	 */

	public void firePropertyChangeEvent(Object object){

		firePropertyChangeEvent(object, null);

	}

	/**

	 * Fires a {@link CdmPropertyChangeEvent} with the given object as source also containing the

	 * originating event

	 *

	 * @param object the object on which the property changed

	 * @param originatingEvent the originating event

	 */

	public void firePropertyChangeEvent(Object object, PropertyChangeEvent originatingEvent){

		firePropertyChangeEvent(new CdmPropertyChangeEvent(object, originatingEvent));

	}

	/**

	 * {@inheritDoc}

	 *

	 * This method gets called whenever the toolkit this composite was created with gets a property change notification.

	 *

	 * It is good advice to check whether the PropertyChangeEvent is destined for the implementing composite.

	 * Implementations should also check for null PropertyChangeEvents and return immediately in that case.

	 * @see eu.etaxonomy.taxeditor.ui.element.ICdmFormElement#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)

	 */

	@Override

    public void propertyChange(PropertyChangeEvent event) {

		// implement in subclasses

	}

	/** {@inheritDoc} */

	@Override

    public boolean containsFormElement(ICdmFormElement formElement){

		if(formElement == this){

			return true;

		}else{

			for(ICdmFormElement element : getElements()){

				boolean contains = element.containsFormElement(formElement);

				if(contains == true){

					return true;

				}

			}

			return false;

		}

	}

	@Override

    public void refresh() {

		// empty default implementation

	}

	/** {@inheritDoc} */

	@Override

	public void setBackground(Color color) {

		for(ICdmFormElement element : getElements()){

			element.setBackground(color);

		}

	}

	@Override

	public void setPersistentBackground(Color color) {

		persistentBackgroundColor = color;

		setBackground(color);

	}

	@Override

	public Color getPersistentBackground() {

		return persistentBackgroundColor;

	}

	public Color getColor(String colorId){

		return AbstractUtility.getColor(colorId);

	}

}