Binding a Xpage DominoDocument to a Bean

问题

is it possible to bind a DominoDocument directly to a Managed Bean. So that I can have a property in my Bean which holds a reference to the DominoDocument all the time?

Appreciating any suggestions/advices!

回答1:

As Per mentioned above, the simplest way to do what you want is instead of binding it to a property in your bean, just access it using a method in your bean.

public DominoDocument getDominoDocument() {

    // Whatever the data source name is you want to get
    String documentName = "document1";  

    Object o = ExtLibUtil.resolveVariable(FacesContext.getCurrentInstance(), documentName);

    // Double check that it is a DominoDocument
    if (o instanceof DominoDocument) {
        return (DominoDocument) o;
    }

    return null;

}

If you are unable to use the Extension Library, then use:

public DominoDocument getDominoDocument() {

    // Whatever the data source name is you want to get
    String documentName = "document1";  

    // Get the VariableResolver for Current FacesContext and Resolve the variable
    FacesContext facesContext = FacesContext.getCurrentInstance();
    VariableResolver resolver = facesContext.getApplication().getVariableResolver();
    Object o = resolver.resolveVariable(facesContext, documentName);

    // Double check that it is a DominoDocument
    if (o instanceof DominoDocument) {
        return (DominoDocument) o;
    }

    return null;

}

Data Sources are persisted between requests using a slightly different mechanism to persistence of managed beans, so if you bind a Data Source to a managed bean property, there might possibly be complications depending on what sort of persistence mode an application is running in. It might be okay though I am not sure. Also there is a complicated DataSource <-> DataContainer <-> DominoDocument ecosystem which the variable resolver knows how to deal with, so it is simplest to just go through the variable resolver when you want to access it.

来源：https://stackoverflow.com/questions/40635829/binding-a-xpage-dominodocument-to-a-bean