Re: [Simple-support] Problem with subclass annotation

[Onno H. <on...@aq...>]

Hi, 

I solved the problem the following way and would be happy for a comment if thats a good and performant way,
especially if it's OK to ignore all methods of the Value Interface except the getType():Class? If i'm right, default behavior is used for the rest.

	Strategy strategy = new Strategy() {

			@Override
			public boolean write(Type arg0, Object arg1,
					NodeMap<OutputNode> arg2, Map arg3) throws Exception {
				return false;
			}

			@Override
			public Value read(Type arg0, NodeMap<InputNode> arg1, Map arg2)
					throws Exception {
				
					if (arg0.getType().equals(Field.class)) {
					InputNode typeNode = arg1.getNode().getAttribute("type");
					String typeValue = typeNode.getValue();

					// remove namespace prefix
					int idx = typeValue.indexOf(':');
					String typeV = typeValue.substring(idx + 1,
							typeValue.length());

					if (typeV.equals("FieldSubClass1")) {

						return new Value() {
							@Override
							public void setValue(Object arg0) {
							}
							@Override
							public boolean isReference() {
								return false;
							}
							@Override
							public Object getValue() {
								return null;
							}
							@Override
							public Class getType() {
								return FieldSubClass1.class;
							}
							@Override
							public int getLength() {
								return 0;
							}
						};
					} else if (typeV.equals("FieldSubClass2")) {

						return new Value() {
							@Override
							public void setValue(Object arg0) {
							}

							@Override
							public boolean isReference() {
								return false;
							}

							@Override
							public Object getValue() {
								return null;
							}

							@Override
							public Class getType() {
								return FieldSubClass2.class;
							}

							@Override
							public int getLength() {
								return 0;
							}
						};
					}
				}
				return null;
			}
		};

		Serializer serializer = new Persister(strategy);
		Wrapper wrapperItem = serializer.read(Wrapper.class, reader,
				false);







Am 18.01.2012 um 13:21 schrieb Vincent Schlatter:

> Hello,
> 
> I'm struggling with the following problem.
> 
> Let's say we have the following XML:
> 
> <?xml version="1.0"?>
> <wrapper xmlns="http://www.example.org" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
>    <obj xsi:type="FieldSubClass1">
>        <property1>some text</property1>
>        <property2>some text</property2>
>    </obj>
>    <obj xsi:type="FieldSubClass2">
>        <property1>some text</property1>
>        <property2>some text</property2>
>        <property3>some text</property3>
>    </obj>
>    <obj xsi:type="FieldSubClass3">
>        <property1>some text</property1>
>        <property2>some text</property2>
>    </obj>
> </wrapper>
> 
> The Java classes are:
> 
> public class Wrapper {
>    private List<Field> fieldList = null;
> }
> 
> public class Field {
>    private String property1 = null;
> }
> 
> public class FieldSubClass1 extends Field {
>    private String property2 = null;
> }
> 
> public class FieldSubClass2 extends Field {
>    private String property2 = null;
>    private String property3 = null;
> }
> 
> public class FieldSubClass3 extends Field {
>    private String property2 = null;
> }
> 
> Is it possible to use Simple for this problem? Simple would need to analyse the xsi:type attribute to find out which sub class to instantiate, as the sub classes cannot be distinguished by their properties.
> 
> I tried a lot of different combinations of annotations but haven't been able to created the designated result.
> 
> Any help would be much appreciated.
> 
> Kind regards,
> Vincent