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package com.vaadin.devday.ui.navigation;
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import java.util.Collection;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.ApplicationEventPublisher;
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import org.springframework.context.annotation.Lazy;
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import com.vaadin.devday.ui.NavigationManager;
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import com.vaadin.navigator.View;
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import com.vaadin.navigator.ViewChangeListener;
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import com.vaadin.spring.annotation.SpringComponent;
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import com.vaadin.spring.annotation.UIScope;
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@SpringComponent
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@UIScope
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class ViewChangeListenerBean implements ViewChangeListener {
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private static final long serialVersionUID = 1913421359807383L;
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@Autowired(required=false)
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private Collection<ViewChangeAllowedVerifier> verifiers = null;
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@Autowired
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@Lazy
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private NavigationManager navigationManager;
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@Autowired
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ApplicationEventPublisher eventBus;
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@Override
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public boolean beforeViewChange(ViewChangeEvent event) {
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View currentView = navigationManager.getCurrentView();
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if (currentView != null && verifiers != null) {
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for (ViewChangeAllowedVerifier verifier : verifiers) {
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if (currentView.equals(verifier)) {
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if (!verifier.isViewChangeAllowed()) {
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return false;
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}
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}
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}
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}
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return true;
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}
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@Override
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public void afterViewChange(ViewChangeEvent event) {
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eventBus.publishEvent(new AfterViewChangeEvent());
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}
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}
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