How to find if a Tab is already opened in Vaadin and setting it active instead of creating a new one

In Vaadin, once you have a TabSheet, and some tabs are already opened, you don't want the same Tab, containing the same content to be opened many times. How can I check that a Tab is already open开发者_如何学Pythoned and set it to as the selected one?

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The Vaadin's TabSheet checks by default, if a component already dded by comparing the component's hashcode.

It means you have to implement the method hashCode() in the component you want to add to the TabSheet.

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Using iterator in tab component, and compare with name.

Iterator<Component> i = tabSheet.getComponentIterator();
    while (i.hasNext()) {
        Component c = (Component) i.next();
        Tab tab = tabSheet.getTab(c);
        if (name.equals(tab.getCaption())) {
            tabSheet.setSelectedTab(c);
            return;
        }
   }

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In new Vaadin it could be solved in this way:

Component component = //...
for (Component c : tabSheet) {
    if (c.equals(component)) {
        // duplicate...
    }
}

But as @CRH mentioned before, you should take care of equal() and hashCode() correctness.

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In my case, it could be done as follow:

Component cmp = /*you component with a description*/;


for (Component c : tabSheet) {
 if (c.getDescription().equals(cmp.getDescription())) {
     System.out.println("Equals Equals");
     return;
 }


}