Now that we have configured a simple class to play with, let’s see what XStream converters can do for us Now let’s convert anything which extends Calendar: Note, that in implementation of a SingleValueConverter is required for attributes, since these objects have to be represented by a single string only. Let’s go for converting a Calendar in a localized string This time we want to reuse our already written converters for the Person and the Calendar and add an own attribute for the gender. The unmarshal method ensures the valid value for the gender by throwing a ConversionException for invalid entries. If the implementation of Birthday ensures, that none of its fields could hold a null value and gender contains a valid value, then we could drop the null condition in the marshal method and in unmarshal we could omit the loop as well as the comparison of the tag names:.

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Java Examples for com.thoughtworks.xstream.io.xml.DomDriver

You work on a stream and accessing the value of a tag or its members will close the surrounding tag that is still active when the method is called. The canConvert method is plain simple.

We convert no derived classes this time, since they might have additional fields. Now that we have configured a simple class to play with, let’s see what XStream converters can do for us Try using an attribute called fullname in the person tag instead of creating a new child node.

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DomDriver (XStream Core API) – Javadoc Extreme

The unmarshal method ensures the valid value for the gender domriver throwing a ConversionException for invalid entries. If the implementation of Birthday ensures, that none of its fields could hold a null value and gender contains a valid value, then we could drop the null condition in the marshal method and in unmarshal we could omit the loop as well as the comparison of the tag names:.

This time we want to reuse our already written converters for the Person and the Calendar and add an own attribute for the gender. Let’s enhance the Person with a String representation, that contains all necessary text to recreate the instance:.

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And the other way around Now let’s convert anything which extends Calendar: Now we can output the data Since the String representation is complete, a nested element is not necessary anymore:. While XStream is capable of converting this class without any problem, we write our own custom converter just for demonstration.

And now let’s go to the unmarshal. Note, that attributes will always have to be written and read first.

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Our converter will receive the Locale in its constructor and we will keep a reference to it in a member variable:. So we make use of an ‘alias’ to change this full class name to something more ‘human’, for example ‘person’.

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Note, that in implementation of a SingleValueConverter is required for attributes, since these objects have to be represented by a single string only. We use the moveDown and domddiver methods to move in the tree hierarchy, so we can simply moveDownread the value and moveUp.

But we reuse the converters registered in XStream for our member fields and handle null values:. But even nicer, our XML is also simplified using the alias for the Person class.

Now we tell whoever calls us that we can handle only Person’s and nothing else, including those classes which extends Person. Now that we know how the Converter interface works, let’s create a simple calendar converter which uses the locale to convert the information.

Let’s go for converting a Calendar in a localized string If this is not what you want, change your canConvert method to return true only if class equals GregorianCalendar.

Last modified: January 14, 2021