marker interface:
package uk.co.tarbard.wfd;
public interface BackingPage {
}
custom property resolver:
package uk.co.tarbard.wfd;
import java.lang.reflect.Field;
import javax.faces.el.EvaluationException;
import javax.faces.el.PropertyNotFoundException;
import javax.faces.el.PropertyResolver;
public class ConstantPropertyResolver extends PropertyResolver {
private PropertyResolver original;
public ConstantPropertyResolver(PropertyResolver original) {
this.original = original;
}
@Override
public Class getType(Object arg0, int arg1) throws EvaluationException,
PropertyNotFoundException {
return original.getType(arg0, arg1);
}
@Override
public Class getType(Object arg0, Object arg1) throws EvaluationException,
PropertyNotFoundException {
return original.getType(arg0, arg1);
}
@Override
public Object getValue(Object arg0, int arg1) throws EvaluationException,
PropertyNotFoundException {
return original.getValue(arg0, arg1);
}
@Override
public Object getValue(Object base, Object property)
throws EvaluationException, PropertyNotFoundException {
Object value = null;
try {
value = original.getValue(base, property);
} catch (PropertyNotFoundException e) {
}
if (null != value) {
return value;
}
if (null == base) {
return null;
}
if (base instanceof BackingPage) {
Field[] declaredFields = base.getClass().getDeclaredFields();
for (int i = 0; i < declaredFields.length; i++) {
Field x = declaredFields[i];
Object constantValue = null;
if (property.equals(x.getName())){
try {
constantValue = x.get(x);
} catch (IllegalArgumentException e) {
throw new PropertyNotFoundException("unable to access property " + property) ;
} catch (IllegalAccessException e) {
throw new PropertyNotFoundException("unable to access property " + property + " check that it is public") ;
}
return constantValue;
}
}
throw new PropertyNotFoundException("unable to locate constant with name " + property + " perhaps you made a typo.");
}
return null;
}
@Override
public boolean isReadOnly(Object arg0, int arg1)
throws EvaluationException, PropertyNotFoundException {
return original.isReadOnly(arg0, arg1);
}
@Override
public boolean isReadOnly(Object arg0, Object arg1)
throws EvaluationException, PropertyNotFoundException {
return original.isReadOnly(arg0, arg1);
}
@Override
public void setValue(Object arg0, int arg1, Object arg2)
throws EvaluationException, PropertyNotFoundException {
original.setValue(arg0, arg1, arg2);
}
@Override
public void setValue(Object arg0, Object arg1, Object arg2)
throws EvaluationException, PropertyNotFoundException {
original.setValue(arg0, arg1, arg2);
}
}