Empty entry in ElementList SimpleXML

Question

my question is simple, but I can\'t find nothing about it.

I Have a list class and an entry class for XML Serialization:

@Root(name = \"entries\")
public         


        

Answer 1

You can check for empty elements manually:

@Root(name = "entries")
@Convert(List.ListConverter.class) // Set the converter
public class List
{
    @ElementList(required = false, entry = "entry", inline = true, empty = true)
    private java.util.List entries;


    public void add(Entry e)
    {
        // Just for testing
        entries.add(e);
    }



    static class ListConverter implements Converter
    {
        @Override
        public List read(InputNode node) throws Exception
        {
            List l = new List();
            InputNode child = node.getNext("entry");

            while( child != null)
            {
                if( child.isEmpty() == true ) // child is an empty tag
                {
                    // Do something if entry is empty
                }
                else // child is not empty
                {
                    Entry e = new Persister().read(Entry.class, child); // Let the Serializer read the Object
                    l.add(e);
                }

                child = node.getNext("entry");
            }

            return l;
        }


        @Override
        public void write(OutputNode node, List value) throws Exception
        {
            // Not required for reading ...
            throw new UnsupportedOperationException("Not supported yet.");
        }
    }
}

How to use:

Serializer ser = new Persister(new AnnotationStrategy()); // Set AnnotationStrategy here!
List l = ser.read(List.class, yourSourceHere);

Documentation:

• Converter
• AnnotationStrategy