com.sun.jersey.server.linking.impl.EntityDescriptor Maven / Gradle / Ivy
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package com.sun.jersey.server.linking.impl;
import com.sun.jersey.server.linking.Link;
import com.sun.jersey.server.linking.Links;
import com.sun.jersey.server.linking.Ref;
import java.lang.reflect.Field;
import java.net.URI;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Describes an entity in terms of its fields, bean properties and {@link Ref}
* annotated fields.
* @author mh124079
*/
public class EntityDescriptor {
// Maintains an internal static cache to optimize processing
private static Map, EntityDescriptor> descriptors
= new HashMap, EntityDescriptor>();
public static synchronized EntityDescriptor getInstance(Class entityClass) {
if (descriptors.containsKey(entityClass)) {
return descriptors.get(entityClass);
} else {
EntityDescriptor descriptor = new EntityDescriptor(entityClass);
descriptors.put(entityClass, descriptor);
return descriptor;
}
}
// instance
private Map nonLinkFields;
private Map linkFields;
private List linkHeaders;
/**
* Construct an new descriptor by inspecting the supplied class.
* @param entityClass
*/
private EntityDescriptor(Class entityClass) {
// create a list of link headers
this.linkHeaders = new ArrayList();
findLinkHeaders(entityClass);
this.linkHeaders = Collections.unmodifiableList(linkHeaders);
// create a list of field names
this.nonLinkFields = new HashMap();
this.linkFields = new HashMap();
findFields(entityClass);
this.nonLinkFields = Collections.unmodifiableMap(this.nonLinkFields);
this.linkFields = Collections.unmodifiableMap(this.linkFields);
}
public Collection getLinkFields() {
return linkFields.values();
}
public Collection getNonLinkFields() {
return nonLinkFields.values();
}
public List getLinkHeaders() {
return linkHeaders;
}
/**
* Find and cache the fields of the supplied class and its superclasses and
* interfaces.
* @param entityClass the class
*/
private void findFields(Class entityClass) {
for (Field f: entityClass.getDeclaredFields()) {
Ref a = f.getAnnotation(Ref.class);
if (a != null) {
Class t = f.getType();
if (t.equals(String.class) || t.equals(URI.class)) {
if (!linkFields.containsKey(f.getName())) {
linkFields.put(f.getName(), new RefFieldDescriptor(f, a, t));
}
} else {
// TODO unsupported type
}
} else {
nonLinkFields.put(f.getName(), new FieldDescriptor(f));
}
}
// look for nonLinkFields in superclasses
Class sc = entityClass.getSuperclass();
if (sc != null && sc != Object.class) {
findFields(sc);
}
// look for nonLinkFields in interfaces
for (Class ic : entityClass.getInterfaces()) {
findFields(ic);
}
}
private void findLinkHeaders(Class entityClass) {
Link linkHeaderAnnotation = entityClass.getAnnotation(Link.class);
if (linkHeaderAnnotation != null) {
linkHeaders.add(new LinkDescriptor(linkHeaderAnnotation));
}
Links linkHeadersAnnotation = entityClass.getAnnotation(Links.class);
if (linkHeadersAnnotation != null) {
for (Link linkHeader: linkHeadersAnnotation.value()) {
linkHeaders.add(new LinkDescriptor(linkHeader));
}
}
// look in superclasses
Class sc = entityClass.getSuperclass();
if (sc != null && sc != Object.class) {
findLinkHeaders(sc);
}
// look in interfaces
for (Class ic : entityClass.getInterfaces()) {
findLinkHeaders(ic);
}
}
}