Betwixt/CustomPropertySuppressionStrategyExampleUsingJava5Annotations

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;
    }
});