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Jersey support for declarative hyperlinking.
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package org.glassfish.jersey.linking;
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;
import javax.ws.rs.core.Link;
/**
* Describes an entity in terms of its fields, bean properties and {@link InjectLink}
* annotated fields.
*
* @author Mark Hadley
* @author Gerard Davison (gerard.davison at oracle.com)
*/
class EntityDescriptor {
// Maintains an internal static cache to optimize processing
private static final Map, EntityDescriptor> descriptors = new HashMap<>();
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()) {
InjectLink a = f.getAnnotation(InjectLink.class);
Class t = f.getType();
if (a != null) {
if (t.equals(String.class) || t.equals(URI.class) || Link.class.isAssignableFrom(t)) {
if (!linkFields.containsKey(f.getName())) {
linkFields.put(f.getName(), new InjectLinkFieldDescriptor(f, a, t));
}
} else {
// TODO unsupported type
}
} else if (f.isAnnotationPresent(InjectLinks.class)) {
if (List.class.isAssignableFrom(t)
|| t.isArray() && Link.class.isAssignableFrom(t.getComponentType())) {
InjectLinks a2 = f.getAnnotation(InjectLinks.class);
linkFields.put(f.getName(), new InjectLinksFieldDescriptor(f, a2, t));
} else {
throw new IllegalArgumentException("Can only inject links onto a List or Link[] object");
}
} 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) {
InjectLink linkHeaderAnnotation = entityClass.getAnnotation(InjectLink.class);
if (linkHeaderAnnotation != null) {
linkHeaders.add(new LinkHeaderDescriptor(linkHeaderAnnotation));
}
InjectLinks linkHeadersAnnotation = entityClass.getAnnotation(InjectLinks.class);
if (linkHeadersAnnotation != null) {
for (InjectLink linkHeader : linkHeadersAnnotation.value()) {
linkHeaders.add(new LinkHeaderDescriptor(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);
}
}
}