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package com.sun.jersey.server.linking.impl;
import com.sun.jersey.server.linking.el.LinkBuilder;
import java.net.URI;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.core.UriInfo;
/**
* Utility class that can inject links into {@link Link} annotated fields in
* an entity.
* @author mh124079
*/
public class RefProcessor<T> {
private EntityDescriptor instanceDescriptor;
public RefProcessor(Class<T> c) {
instanceDescriptor = EntityDescriptor.getInstance(c);
}
/**
* Inject any {@link Link} annotated fields in the supplied entity and
* recursively process its fields.
* @param entity the entity object returned by the resource method
* @param uriInfo the uriInfo for the request
*/
public void processLinks(T entity, UriInfo uriInfo) {
Set<Object> processed = new HashSet<Object>();
Object resource = uriInfo.getMatchedResources().get(0);
processLinks(entity, resource, entity, processed, uriInfo);
}
/**
* Inject any {@link Link} annotated fields in the supplied instance. Called
* once for the entity and then recursively for each member and field.
* @param entity
* @param processed a list of already processed objects, used to break
* recursion when processing circular references.
* @param uriInfo
*/
private void processLinks(Object entity, Object resource, Object instance,
Set<Object> processed, UriInfo uriInfo) {
if (instance==null || processed.contains(instance))
return; // ignore null properties and defeat circular references
processed.add(instance);
// Process any @Link annotated fields in entity
for (RefFieldDescriptor linkField: instanceDescriptor.getLinkFields()) {
if (LinkBuilder.evaluateCondition(linkField.getCondition(), entity, resource, instance)) {
URI uri = LinkBuilder.buildURI(linkField, entity, resource, instance, uriInfo);
linkField.setPropertyValue(instance, uri);
}
}
// If entity is an array or collection then process members
Class<?> instanceClass = instance.getClass();
if (instanceClass.isArray() && Object[].class.isAssignableFrom(instanceClass)) {
Object array[] = (Object[])instance;
for (Object member: array) {
processMember(entity, resource, member, processed, uriInfo);
}
} else if (instance instanceof Collection) {
Collection collection = (Collection)instance;
for (Object member: collection) {
processMember(entity, resource, member, processed, uriInfo);
}
}
// Recursively process all member fields
for (FieldDescriptor member: instanceDescriptor.getNonLinkFields()) {
processMember(entity, resource, member.getFieldValue(instance), processed, uriInfo);
}
}
private void processMember(Object entity, Object resource, Object member, Set<Object> processed, UriInfo uriInfo) {
if (member != null) {
RefProcessor proc = new RefProcessor(member.getClass());
proc.processLinks(entity, resource, member, processed, uriInfo);
}
}
}