[Jakarta-commons Wiki] Update of "Betwixt/CustomPropertySuppressionStrategyExampleUsingJava5Annotations" by AlexVassiliev

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The following page has been changed by AlexVassiliev:
http://wiki.apache.org/jakarta-commons/Betwixt/CustomPropertySuppressionStrategyExampleUsingJava5Annotations

New page:
= Customizing PropertySuppressionStrategy to use Java 5 Annotations =

Suppose we want to mark properties to be serialized with Java 5 ''@Persistent'' annotation. So our bean code will look somewhat like this:

{{{public class Person {
    private String name;

    @Persistent
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
} }}}

===== Here is one way of doing that =====

First define annotation:
{{{@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public static @interface Persistent {
} }}}

Then replace the default PropertySuppressionStrategy with our custom one:
{{{beanWriter.getXMLIntrospector().getConfiguration().setPropertySuppressionStrategy(new PropertySuppressionStrategy() {
    @Override
    public boolean suppressProperty(Class classContainingTheProperty, Class propertyType, String propertyName) {
        boolean res = true;
        PropertyDescriptor[] pds;
        try {
            pds = Introspector.getBeanInfo(classContainingTheProperty).getPropertyDescriptors();
        } catch (IntrospectionException e) {
            throw new Error(e);
        }
        for (int i = 0; i < pds.length; i++) {
            if (pds[i].getName().equals(propertyName) && pds[i].getReadMethod().isAnnotationPresent(Persistent.class)) {
                res = false;
                break;
            }
        }
        return res;
    }
}); }}}

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