Since there is no required annotation in jersey, I decided to create
my own with the following implementation:
public class RequiredParamFilter implements ResourceFilterFactory {
/* (non-Javadoc)
* @see com.sun.jersey.spi.container.ResourceFilterFactory#create(com.sun.jersey.api.model.AbstractMethod)
*/
@Override
public List<ResourceFilter> create(AbstractMethod am) {
//if it's a resource method we need to create a list of required
fields to be checked every time
if (am instanceof AbstractSubResourceMethod) {
ArrayList<String> requiredFields =
getAnnotatedFields(am);
return Collections.<ResourceFilter> singletonList(new
Filter(requiredFields));
}
return null;
}
private ArrayList<String> getAnnotatedFields(AbstractMethod am) {
ArrayList<String> requiredFields = new ArrayList<String>();
List<Parameter> parameters =
((AbstractSubResourceMethod) am).getParameters();
//check if one of the parameters has Required annotation
if (parameters != null && parameters.size() > 0) {
for (Parameter parameter : parameters)
if
(parameter.isAnnotationPresent(Required.class)) {
requiredFields.add(parameter.getSourceName());
}
}
return requiredFields;
}
private class Filter implements ResourceFilter, ContainerRequestFilter {
private final ArrayList<String> requiredParameters;
protected Filter() {
this.requiredParameters = null;
}
protected Filter(ArrayList<String> requiredParameters) {
this.requiredParameters = requiredParameters;
}
// ResourceFilter
@Override
public ContainerRequestFilter getRequestFilter() {
return this;
}
@Override
public ContainerResponseFilter getResponseFilter() {
return null;
}
// ContainerRequestFilter
@Override
public ContainerRequest filter(ContainerRequest request) {
if (requiredParameters != null &&
requiredParameters.size() > 0) {
//loop over them and see if the
required parameters are not empty
MultivaluedMap<String, String> params =
request.getQueryParameters();
StringBuffer missingParams = new StringBuffer();
for (String reqParam : requiredParameters) {
List<String> paramValues =
params.get(reqParam);
if (paramValues == null ||
paramValues != null && paramValues.size() == 0)
missingParams.append(reqParam + ",");
}
if (missingParams.length() > 0)
throw new
WebApplicationException(Response.status(400).entity("Required
parameters are missing: " + missingParams)
.type(MediaType.TEXT_PLAIN).build());
}
return request;
}
}
}
However, since I don't want the user to enter @Required(value) but
only @Required and I will figure the field name based on the
sourceName I wrote:
requiredFields.add(parameter.getSourceName());
However I get: null for parameter.getSourceName and also for getSource
- UNKOWN.
Is it a bug in your code to assign the setSourceName or something is
wrong with my code?
Thanks!