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package eu.etaxonomy.vaadin.mvp;
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import java.io.Serializable;
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import org.apache.log4j.Logger;
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import org.hibernate.Session;
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import org.hibernate.engine.internal.StatefulPersistenceContext;
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import org.hibernate.engine.spi.SessionImplementor;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Qualifier;
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import org.springframework.security.core.context.SecurityContext;
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import org.springframework.security.core.context.SecurityContextHolder;
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import eu.etaxonomy.cdm.api.application.CdmRepository;
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import eu.etaxonomy.vaadin.ui.navigation.NavigationManager;
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/**
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* AbstractPresenter is the base class of all presenter components. Presenter's
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* role is to govern the view and control the complex UI logic based on
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* notifications presenter receives from its view.
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*
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* @author Peter / Vaadin
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*
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* @param <V>
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* type of the view this presenter governs
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*/
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public abstract class AbstractPresenter<V extends ApplicationView> implements Serializable {
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private static final long serialVersionUID = 5260910510283481832L;
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public static final Logger logger = Logger.getLogger(AbstractPresenter.class);
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private V view;
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protected V getView() {
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if(view == null){
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Logger.getLogger(this.getClass()).warn("CDM-VAADIN#6562: presenter " + toString() + " without view.");
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}
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return view;
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}
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@Autowired
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@Qualifier("cdmRepository")
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private CdmRepository repo;
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@Autowired
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private NavigationManager navigationManager;
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// protected DefaultTransactionDefinition definition = null;
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// protected TransactionDefinition getTransactionDefinition(){
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// if(definition == null){
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// definition = new DefaultTransactionDefinition();
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// definition.setReadOnly(true);
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// }
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// return definition;
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// }
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/**
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* @return the repo
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*/
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public CdmRepository getRepo() {
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return repo;
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}
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/**
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* @return
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*
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* FIXME is it ok to use the SecurityContextHolder or do we need to hold the context in the vaadin session?
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*/
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protected SecurityContext currentSecurityContext() {
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return SecurityContextHolder.getContext();
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}
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/**
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* @return
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*/
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protected Session getSession() {
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Session session = getRepo().getSession();
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if(logger.isTraceEnabled()){
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if(session.isOpen()){
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logger.trace(this._toString() + ".getSession() - session:" + session.hashCode() +", persistenceContext: " + ((SessionImplementor)session).getPersistenceContext() + " - " + session.toString());
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} else {
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logger.trace(this._toString() + ".getSession() - session:" + session.hashCode() +" is closed ");
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}
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}
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return session;
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}
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protected String _toString(){
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return this.getClass().getSimpleName() + "@" + this.hashCode();
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}
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/**
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* Notifies the presenter that its view is initialized so that presenter can
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* start its own initialization if required.
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*
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* @param view
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*/
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protected void init(V view) {
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logger.trace(String.format("Presenter %s init()", _toString()));
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this.view = view;
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onPresenterReady();
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}
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/**
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* Extending classes should overwrite this method in order to perform logic
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* after presenter has finished initializing.
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*
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* At this point in the life cycle of the MVP the {@link AbstractView#initContent() initContent()}
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* method has been executed already.
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*/
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protected void onPresenterReady() {
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logger.trace(String.format("Presenter %s ready", _toString()));
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}
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/**
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* @return
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*/
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private StatefulPersistenceContext getPersitenceContext() {
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return (StatefulPersistenceContext)((SessionImplementor)getSession()).getPersistenceContext();
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}
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public final void onViewEnter() {
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logger.trace(String.format("%s onViewEnter()", _toString()));
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handleViewEntered();
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}
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public void onViewExit() {
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logger.trace(String.format("%s onViewExit()", _toString()));
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handleViewExit();
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}
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/**
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* Extending classes should overwrite this method to react to the event when
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* user has navigated into the view that this presenter governs.
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* For implementations of {@link AbstractPopupEditor AbstractPopupEditors} this is usually
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* called before the data item has been bound. This order is guaranteed since popup editors
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* are managed through the {@link NavigationManagerBean}
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*/
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public void handleViewEntered() {
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}
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/**
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* Extending classes may overwrite this method to react to
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* the event when user leaves the view that this presenter
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* governs. This method is executed before un-binding and closing the
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* conversation holder.
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*/
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public void handleViewExit() {
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}
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/**
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* @return the navigationManager
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*/
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public NavigationManager getNavigationManager() {
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return navigationManager;
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}
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/**
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* @param repo the repo to set
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*/
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protected void setRepo(CdmRepository repo) {
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this.repo = repo;
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}
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/**
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* @param navigationManager the navigationManager to set
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*/
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protected void setNavigationManager(NavigationManager navigationManager) {
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this.navigationManager = navigationManager;
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}
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}
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