com.sun.jersey.server.linking.impl.EntityDescriptor Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
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.lang.reflect.Modifier;
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 {
// see issue http://java.net/jira/browse/JERSEY-625
if(((f.getModifiers() & Modifier.STATIC) > 0) ||
f.getName().startsWith("java.") ||
f.getName().startsWith("javax.")
)
continue;
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);
}
}
}