Xstream - String array

Question

First things first, I'm no asking for a solution but a way to think.

I got some data that I need to serialize to check out later... I know how to do it.. but the fields names are the problem...

The data structure contains:

Name of the Field
CoordX
CoordY
Value

(There are like.. 20 different fields. I need to check a biiiggggg string log...)

I could use a single String[][] or several Strings[] ... as I said.. the problem is how it appears on the XML...

If I do a single arraylist multidimensional -> [][] I got this

<teste>
      <string-array>
        <string>fieldName</string>
        <string>x</string>
        <string>y</string>
        <string>value</string>
      </string-array>
      <string-array>
        <string>fieldName</string>
        <string>x</string>
        <string>y</string>
        <string>value</string>
      </string-array>
</teste>

And if I do a single string[] I can put the name of the String as the field name

<Fieldname>      
    <string>X</string>
    <string>y</string>
    <string>Value</string>
</Fieldname>

I saw that normal alias is for ALL fields (@XStreamImplicit(itemFieldName="part")) and that don't solve my problem..

It could be worthless if on the other side when I do deserialization, check the log by line and no by field (I know line 1 is field name, line 2 is x..etc)..

So.. what do you guys think?

miha · Accepted Answer · 2011-05-26 12:43:07Z

I usually design serialization depending on the contents of my "fields". Say that your name and value fields are relatively small, you could serialize them as

<list>
  <field name="foo" cordX="12324" cordY="1324" value="value of field foo" />
  <field name="foo" cordX="12324" cordY="1324" value="value of field foo" />
</list>

of course, if value is long, then you don't want to serialize it as attribute, but as a regular field value like so:

<list>
  <field name="foo" cordX="12324" cordY="1324">The long value </field>
  <field name="foo" cordX="12324" cordY="1324">Even longer field value...</field>
</list>

You can achieve this using XStream like so:

public class Run {
    public static void main(String[] args) {
        XStream xs = new XStream(new DomDriver());
        xs.processAnnotations(new Class[] { Field.class, Container.class });
        Container c = new Container();
        c.addField("boo", 1,2, "desc");
        c.addField("boo", 1,2, "desc");
        String serialized = xs.toXML(c);
        System.out.println(serialized);

        // deserialize
        Container newContainer = (Container) xs.fromXML(serialized);
        if (newContainer.fields.size() != 2) {
            System.out.println("Not deserialized as expected...");
        }

        // if you don't want "container"
        xs.alias("mylist", List.class);
        System.out.println(xs.toXML(c.fields));
    }
}

where you define your Container and Field like so:

@XStreamAlias("mylistofitems")
public class Container {
    public List<Field> fields;

    public void addField(String name, int x, int y, String desc) {
        if (fields == null) fields = new ArrayList<Field>();
        fields.add(new Field(name, x,y, desc));

    }
}

@XStreamAlias("field")
public class Field {
    public Field() {}
    public Field(String name, int x, int y, String desc) {
        this.name = name;
        cordX = x;
        cordY = y;
        value = desc;
    }
    @XStreamAsAttribute
    private String name;
    @XStreamAsAttribute
    private int cordX;
    @XStreamAsAttribute
    private int cordY;
    @XStreamAsAttribute
    private String value;
}

The program gives this output:

<mylistofitems>
  <fields>
    <field name="boo" cordX="1" cordY="2" value="desc"/>
    <field name="boo" cordX="1" cordY="2" value="desc"/>
  </fields>
</mylistofitems>
<mylist>
  <field name="boo" cordX="1" cordY="2" value="desc"/>
  <field name="boo" cordX="1" cordY="2" value="desc"/>
</mylist>

Hope this helps.

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