EDIT

/**

 * 

 */

package eu.etaxonomy.taxeditor.forms;

import java.util.HashSet;

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;

/**

 * <p>Abstract AbstractCdmFormElement class.</p>

 *

 * @author n.hoffmann

 * @version $Id: $

 */

public abstract class AbstractCdmFormElement implements IPropertyChangeEmitter, ICdmFormElement, ISelectable {

	protected CdmFormFactory formFactory;

	private Set<IPropertyChangeListener> propertyChangeListeners;

	private Composite layoutComposite;

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

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

	private ICdmFormElement parentElement;

	/**

	 * <p>Constructor for AbstractCdmFormElement.</p>

	 *

	 * @param formFactory a {@link eu.etaxonomy.taxeditor.forms.CdmFormFactory} object.

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

	 */

	protected AbstractCdmFormElement(CdmFormFactory formFactory, Composite layoutComposite){

		this.layoutComposite = layoutComposite;

		this.formFactory = formFactory;

	}

	/**

	 * <p>Constructor for AbstractCdmFormElement.</p>

	 *

	 * @param formFactory a {@link eu.etaxonomy.taxeditor.forms.CdmFormFactory} object.

	 * @param formElement a {@link eu.etaxonomy.taxeditor.forms.ICdmFormElement} object.

	 */

	public AbstractCdmFormElement(CdmFormFactory formFactory, ICdmFormElement formElement) {

		this(formFactory, formElement.getLayoutComposite());

		this.parentElement = formElement;

//		addControl(layoutComposite);

	}

	/**

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

	 *

	 * @return a {@link eu.etaxonomy.taxeditor.forms.CdmFormFactory} object.

	 */

	public CdmFormFactory getFormFactory() {

		return formFactory;

	}

	/** {@inheritDoc} */

	public Color getColor(boolean selected) {

		return selected ? SELECTED : NOT_SELECTED;

	}

	/**

	 * 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.

	 */

	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);

	}

	/**

	 * <p>removeControl</p>

	 *

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

	 */

	protected void removeControl(Control child){

		controls.remove(child);

	}

	/**

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

	 *

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

	 */

	public Set<ICdmFormElement> getElements(){

		return elements;

	}

	/**

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

	 *

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

	 */

	public ICdmFormElement getParentElement(){

		return parentElement;

	}

	/** {@inheritDoc} */

	public void addElement(ICdmFormElement element){

		elements.add(element);

	}

	/**

	 * <p>removeElement</p>

	 *

	 * @param element a {@link eu.etaxonomy.taxeditor.forms.ICdmFormElement} object.

	 */

	protected void removeElement(ICdmFormElement element){

		elements.remove(element);

	}

	/**

	 * <p>removeElements</p>

	 */

	public void removeElements(){

		for(ICdmFormElement childElement : 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

			if(childElement instanceof IPropertyChangeListener){

				formFactory.removePropertyChangeListener((IPropertyChangeListener) childElement); 

			}

			// dispose of the controls

			removeControls(childElement);

		}

		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.

	 */

	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;

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.forms.ICdmFormComposite#getPropertyChangeListeners()

	 */

	/**

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

	 *

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

	 */

	public Set<IPropertyChangeListener> getPropertyChangeListeners() {

		return propertyChangeListeners;

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.forms.ICdmFormComposite#setPropertyChangeListeners(org.eclipse.core.runtime.ListenerList)

	 */

	/** {@inheritDoc} */

	public void setPropertyChangeListeners(Set<IPropertyChangeListener> propertyChangeListeners){

		this.propertyChangeListeners = propertyChangeListeners;

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.forms.IPropertyChangeEmitter#firePropertyChangeEvent()

	 */

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.forms.ICdmFormComposite#firePropertyChangeEvent(org.eclipse.jface.util.PropertyChangeEvent)

	 */

	/** {@inheritDoc} */

	public void firePropertyChangeEvent(CdmPropertyChangeEvent event) {

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

		for(Object listener : propertyChangeListeners){

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

		}

	}

	/**

	 * {@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.forms.ICdmFormElement#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)

	 */

	public void propertyChange(PropertyChangeEvent event) {

		// implement in subclasses

	}

	/** {@inheritDoc} */

	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;

		}

	}

	/*

	 * (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.forms.ICdmFormElement#refresh()

	 */

	/**

	 * <p>refresh</p>

	 */

	public void refresh() {

		// empty default implementation	

	}

	/** {@inheritDoc} */

	@Override

	public void setBackground(Color color) {

		for(ICdmFormElement element : getElements()){

			element.setBackground(color);

		}

	}

}