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org.glassfish.jersey.server.model.Resource Maven / Gradle / Ivy
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*
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* 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
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package org.glassfish.jersey.server.model;
import java.lang.reflect.Modifier;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import javax.ws.rs.Path;
import org.glassfish.jersey.internal.Errors;
import org.glassfish.jersey.server.internal.LocalizationMessages;
import org.glassfish.jersey.server.model.internal.ModelHelper;
import org.glassfish.jersey.uri.PathPattern;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
/**
* Model of a single resource component.
*
* Resource component model represents a collection of {@link ResourceMethod methods}
* grouped under the same parent request path template. {@code Resource} class is also
* the main entry point to the programmatic resource modeling API that provides ability
* to programmatically extend the existing JAX-RS annotated resource classes or build
* new resource models that may be utilized by Jersey runtime.
*
*
* For example:
*
* @Path("hello")
* public class HelloResource {
* @GET
* @Produces("text/plain")
* public String sayHello() {
* return "Hello!";
* }
* }
*
* ...
*
* // Register the annotated resource.
* ResourceConfig resourceConfig = new ResourceConfig(HelloResource.class);
*
* // Add new "hello2" resource using the annotated resource class
* // and overriding the resource path.
* Resource.Builder resourceBuilder =
* Resource.builder(HelloResource.class, new LinkedList<ResourceModelIssue>())
* .path("hello2");
*
* // Add a new (virtual) sub-resource method to the "hello2" resource.
* resourceBuilder.addChildResource("world").addMethod("GET")
* .produces("text/plain")
* .handledBy(new Inflector<Request, String>() {
* @Override
* public String apply(Request request) {
* return "Hello World!";
* }
* });
*
* // Register the new programmatic resource in the application's configuration.
* resourceConfig.registerResources(resourceBuilder.build());
*
* The following table illustrates the supported requests and provided responses
* for the application configured in the example above.
*
*
* Request Response Method invoked
*
*
* {@code "GET /hello"} {@code "Hello!"} {@code HelloResource.sayHello()}
*
*
* {@code "GET /hello2"} {@code "Hello!"} {@code HelloResource.sayHello()}
*
*
* {@code "GET /hello2/world"} {@code "Hello World!"} {@code Inflector.apply()}
*
*
*
*
* @author Marek Potociar (marek.potociar at oracle.com)
* @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
*/
public final class Resource implements Routed, ResourceModelComponent {
/**
* Resource model component builder.
*/
public static final class Builder {
private List names;
private String path;
private final Set methodBuilders;
private final Set childResourceBuilders;
private final List childResources;
private final List resourceMethods;
private ResourceMethod resourceLocator;
private final Set> handlerClasses;
private final Set handlerInstances;
private final Resource.Builder parentResource;
private Builder(final Resource.Builder parentResource) {
this.methodBuilders = Sets.newIdentityHashSet();
this.childResourceBuilders = Sets.newIdentityHashSet();
this.childResources = Lists.newLinkedList();
this.resourceMethods = Lists.newLinkedList();
this.handlerClasses = Sets.newIdentityHashSet();
this.handlerInstances = Sets.newIdentityHashSet();
this.parentResource = parentResource;
name("[unnamed]");
}
private Builder(final String path) {
this((Resource.Builder) null);
path(path);
}
private Builder(final String path, final Resource.Builder parentResource) {
this(parentResource);
this.path = path;
}
private Builder() {
this((Resource.Builder) null);
}
private boolean isEmpty() {
return this.path == null &&
methodBuilders.isEmpty() &&
childResourceBuilders.isEmpty() &&
resourceMethods.isEmpty() &&
childResources.isEmpty() &&
resourceLocator == null;
}
/**
* Define a new name of the built resource.
*
* The resource model name is typically used for reporting
* purposes (e.g. validation etc.).
*
* @param name new name of the resource.
* @return updated builder object.
* @see org.glassfish.jersey.server.model.Resource#getName()
*/
public Builder name(final String name) {
this.names = Lists.newArrayList(name);
return this;
}
/**
* Define a new path for the built resource.
*
* NOTE: Invoking this method marks a resource as a root resource.
*
* @param path new path for the resource.
* @return updated builder object.
*/
public Builder path(final String path) {
this.path = path;
return this;
}
/**
* Add a new method model to the resource for processing requests of
* the specified HTTP method.
*
* The returned builder is automatically bound to the the resource. It is
* not necessary to invoke the {@link ResourceMethod.Builder#build() build()}
* method on the method builder after setting all the data. This will be
* done automatically when the resource is built.
*
* @param httpMethod HTTP method that will be processed by the method.
* @return a new resource method builder.
*/
public ResourceMethod.Builder addMethod(final String httpMethod) {
ResourceMethod.Builder builder = new ResourceMethod.Builder(this);
methodBuilders.add(builder);
return builder.httpMethod(httpMethod);
}
/**
* Add a new arbitrary method model to the resource.
*
* The returned builder is automatically bound to the the resource. It is
* not necessary to invoke the {@link ResourceMethod.Builder#build() build()}
* method on the method builder after setting all the data. This will be
* done automatically when the resource is built.
*
* @return a new resource method builder.
*/
public ResourceMethod.Builder addMethod() {
ResourceMethod.Builder builder = new ResourceMethod.Builder(this);
methodBuilders.add(builder);
return builder;
}
/**
* Add a new child resource to the resource.
*
* The returned builder is automatically bound to the the resource. It is
* not necessary to invoke the {@link Resource.Builder#build() build()}
* method on the resource builder after setting all the data. This will be
* done automatically when the resource is built.
*
* @param relativePath The path of the new child resource relative to this resource.
* @return child resource builder.
*/
public Builder addChildResource(String relativePath) {
if (this.parentResource != null) {
throw new IllegalStateException(LocalizationMessages.RESOURCE_ADD_CHILD_ALREADY_CHILD());
}
final Builder resourceBuilder = new Builder(relativePath, this);
childResourceBuilders.add(resourceBuilder);
return resourceBuilder;
}
/**
* Add an existing Resource as a child resource of current resource.
*
* @param resource Resource to be added as child resource.
*/
public void addChildResource(Resource resource) {
this.childResources.add(resource);
}
/**
* Merge methods from a given resource model into this resource model builder.
*
* @param resource to be merged into this resource model builder.
* @return updated builder object.
*/
public Builder mergeWith(final Resource resource) {
this.resourceMethods.addAll(resource.getResourceMethods());
this.childResources.addAll(resource.childResources);
if (resourceLocator != null && resource.subResourceLocator != null) {
Errors.processWithException(new Runnable() {
@Override
public void run() {
Errors.error(this, LocalizationMessages.RESOURCE_MERGE_CONFLICT_LOCATORS(Resource.Builder.this,
resource, path), true);
}
});
} else if (resource.subResourceLocator != null) {
this.resourceLocator = resource.subResourceLocator;
}
this.handlerClasses.addAll(resource.getHandlerClasses());
this.handlerInstances.addAll(resource.getHandlerInstances());
this.names.addAll(resource.names);
return this;
}
/**
* Merge methods from a given resource model builder into this resource model
* builder.
*
* NOTE: Any "open" method builders in the supplied {@code resourceBuilder} that have
* not been {@link org.glassfish.jersey.server.model.ResourceMethod.Builder#build()
* explicitly converted to method models} will be closed as part of this merge operation
* before merging the resource builder instances.
*
*
* @param resourceBuilder to be merged into this resource model builder.
* @return updated builder object.
*/
public Builder mergeWith(final Builder resourceBuilder) {
resourceBuilder.processMethodBuilders();
this.resourceMethods.addAll(resourceBuilder.resourceMethods);
this.childResources.addAll(resourceBuilder.childResources);
if (Resource.Builder.this.resourceLocator != null && resourceBuilder.resourceLocator != null) {
Errors.processWithException(new Runnable() {
@Override
public void run() {
Errors.warning(this, LocalizationMessages.RESOURCE_MERGE_CONFLICT_LOCATORS(Resource.Builder.this,
resourceBuilder, path));
}
});
} else if (resourceBuilder.resourceLocator != null) {
this.resourceLocator = resourceBuilder.resourceLocator;
}
this.handlerClasses.addAll(resourceBuilder.handlerClasses);
this.handlerInstances.addAll(resourceBuilder.handlerInstances);
this.names.addAll(resourceBuilder.names);
return this;
}
/**
* Called when a new resource, sub-resource and sub-resource locator method
* was built and should be registered with the resource builder.
*
* This is a friend call-back API exposed for a use by a {@link ResourceMethod.Builder
* ResourceMethod.Builder}.
*
*
* @param builder builder instance that built the method.
* @param method new resource, sub-resource or sub-resource locator
*/
void onBuildMethod(ResourceMethod.Builder builder, ResourceMethod method) {
Preconditions.checkState(methodBuilders.remove(builder),
"Resource.Builder.onBuildMethod() invoked from a resource method builder " +
"that is not registered in the resource builder instance.");
switch (method.getType()) {
case RESOURCE_METHOD:
resourceMethods.add(method);
break;
case SUB_RESOURCE_LOCATOR:
if (resourceLocator != null) {
Errors.processWithException(new Runnable() {
@Override
public void run() {
Errors.error(this, LocalizationMessages.AMBIGUOUS_SRLS(this, path), true);
}
});
}
resourceLocator = method;
break;
}
final MethodHandler methodHandler = method.getInvocable().getHandler();
if (methodHandler.isClassBased()) {
handlerClasses.add(methodHandler.getHandlerClass());
} else {
handlerInstances.add(methodHandler.getHandlerInstance());
}
}
private void onBuildChildResource(Builder childResourceBuilder, Resource childResource) {
Preconditions.checkState(childResourceBuilders.remove(childResourceBuilder),
"Resource.Builder.onBuildChildResource() invoked from a resource builder " +
"that is not registered in the resource builder instance as a child resource builder.");
childResources.add(childResource);
}
private List mergeResources(List resources) {
List mergedResources = Lists.newArrayList();
for (int i = 0; i < resources.size(); i++) {
Resource outer = resources.get(i);
Resource.Builder builder = null;
for (int j = i + 1; j < resources.size(); j++) {
Resource inner = resources.get(j);
if (outer.getPath().equals(inner.getPath())) {
if (builder == null) {
builder = Resource.builder(outer);
}
builder.mergeWith(inner);
resources.remove(j);
j--;
}
}
if (builder == null) {
mergedResources.add(outer);
} else {
mergedResources.add(builder.build());
}
}
return mergedResources;
}
/**
* Build a new resource model.
*
* @return new (immutable) resource model.
*/
public Resource build() {
processMethodBuilders();
processChildResourceBuilders();
final List mergedChildResources = mergeResources(childResources);
Set> classes = Sets.newHashSet(handlerClasses);
Set instances = Sets.newHashSet(handlerInstances);
for (Resource childResource : mergedChildResources) {
classes.addAll(childResource.getHandlerClasses());
instances.addAll(childResource.getHandlerInstances());
}
final Resource resource = new Resource(
immutableCopy(names),
path,
immutableCopy(resourceMethods),
resourceLocator,
mergedChildResources,
immutableCopy(classes),
immutableCopy(instances));
if (parentResource != null) {
parentResource.onBuildChildResource(this, resource);
}
return resource;
}
private static List immutableCopy(List list) {
return list.isEmpty() ? Collections.emptyList() : Collections.unmodifiableList(Lists.newArrayList(list));
}
private static Set immutableCopy(Set set) {
if (set.isEmpty()) {
return Collections.emptySet();
}
final Set result = Sets.newIdentityHashSet();
result.addAll(set);
return set;
}
private void processMethodBuilders() {
// We have to iterate the set this way to prevent ConcurrentModificationExceptions
// caused by the nested invocation of Set.remove(...) in Resource.Builder.onBuildMethod(...).
while (!methodBuilders.isEmpty()) {
methodBuilders.iterator().next().build();
}
}
private void processChildResourceBuilders() {
// We have to iterate the set this way to prevent ConcurrentModificationExceptions
// caused by the nested invocation of Set.remove(...) in Resource.Builder.onBuildChildResource(...).
while (!childResourceBuilders.isEmpty()) {
childResourceBuilders.iterator().next().build();
}
}
}
/**
* Get a new unbound resource model builder.
*
* @return new unbound resource model builder.
* @see Resource.Builder#path(java.lang.String)
*/
public static Builder builder() {
return new Builder();
}
/**
* Get a new resource model builder for a resource bound to a given path.
*
* @param path resource path.
* @return new resource model builder.
* @see Resource.Builder#path(java.lang.String)
*/
public static Builder builder(final String path) {
return new Builder(path);
}
/**
* Creates a {@link Builder resource builder} instance from the list of {@code resource} which can be merged
* into a single resource. It must be possible to merge the {@code resources} into a single valid resource.
* For example all resources must have the same {@link Resource#getPath() path}, they cannot have ambiguous methods
* on the same path, etc.
*
* @param resources Resources with the same path.
* @return Resource builder initialized from merged resources.
*/
public static Builder builder(List resources) {
Builder builder = null;
String path = null;
for (Resource resource : resources) {
if (builder == null) {
builder = Resource.builder(resource);
path = resource.getPath();
} else {
if ((resource.getPath() == null && path == null) || (path != null && path.equals(resource.getPath()))) {
builder.mergeWith(resource);
} else {
throw new IllegalArgumentException(LocalizationMessages.ERROR_RESOURCES_CANNOT_MERGE());
}
}
}
return builder;
}
/**
* Create a resource model builder initialized by introspecting an annotated
* JAX-RS resource class.
*
* Method performs an {@link #isAcceptable(java.lang.Class) acceptability} check,
* on the resource class prior to the resource model creation.
*
* @param resourceClass resource class to be modelled.
* @return resource model builder initialized by the class or {@code null} if the
* class does not represent a resource.
* @throws IllegalArgumentException in case the class is not
* {@link #isAcceptable(java.lang.Class) acceptable}
* as a JAX-RS resource.
*/
public static Builder builder(Class resourceClass) throws IllegalArgumentException {
final Builder builder = new IntrospectionModeller(resourceClass).createResourceBuilder();
return builder.isEmpty() ? null : builder;
}
/**
* Create a resource model initialized by introspecting an annotated
* JAX-RS resource class.
*
* Method performs an {@link #isAcceptable(java.lang.Class) acceptability} check,
* on the resource class prior to the resource model creation.
*
* @param resourceClass resource class to be modelled.
* @return resource model initialized by the class or {@code null} if the
* class does not represent a resource.
* @throws IllegalArgumentException in case the class is not
* {@link #isAcceptable(java.lang.Class) acceptable}
* as a JAX-RS resource.
*/
public static Resource from(Class resourceClass) throws IllegalArgumentException {
final Builder builder = new IntrospectionModeller(resourceClass).createResourceBuilder();
return builder.isEmpty() ? null : builder.build();
}
/**
* Check if the class is acceptable as a JAX-RS provider or resource.
*
* Method returns {@code false} if the class is either
*
* abstract
* interface
* annotation
* primitive
* local class
* non-static member class
*
*
* @param c class to be checked.
* @return {@code true} if the class is an acceptable JAX-RS provider or
* resource, {@code false} otherwise.
*/
public static boolean isAcceptable(Class c) {
return !((c.getModifiers() & Modifier.ABSTRACT) != 0
|| c.isPrimitive()
|| c.isAnnotation()
|| c.isInterface()
|| c.isLocalClass()
|| (c.isMemberClass() && (c.getModifiers() & Modifier.STATIC) == 0));
}
/**
* Get the resource class {@link Path @Path} annotation.
*
* May return {@code null} in case there is no {@code @Path} annotation on the resource.
*
* @param resourceClass resource class.
* @return {@code @Path} annotation instance if present on the resource class (i.e.
* the class is a root resource class), or {@code null} otherwise.
*/
public static Path getPath(Class resourceClass) {
return ModelHelper.getAnnotatedResourceClass(resourceClass).getAnnotation(Path.class);
}
/**
* Get a new resource model builder initialized from a given resource model.
*
* @param resource resource model initializing the resource builder.
* @return new resource model builder.
*/
public static Builder builder(Resource resource) {
final Builder b;
if (resource.path == null) {
b = new Builder();
} else {
b = new Builder(resource.path);
}
b.resourceMethods.addAll(resource.resourceMethods);
b.childResources.addAll(resource.getChildResources());
b.resourceLocator = resource.subResourceLocator;
b.handlerClasses.addAll(resource.handlerClasses);
b.handlerInstances.addAll(resource.handlerInstances);
b.names.addAll(resource.names);
return b;
}
private final List names;
private transient String name;
private final String path;
private final PathPattern pathPattern;
private final List resourceMethods;
private final ResourceMethod subResourceLocator;
private final List childResources;
private final Set> handlerClasses;
private final Set handlerInstances;
private Resource(
final List names,
final String path,
final List resourceMethods,
final ResourceMethod subResourceLocator,
final List childResources,
final Set> handlerClasses,
final Set handlerInstances) {
this.names = names;
this.path = path;
this.pathPattern = (path == null || path.isEmpty()) ?
PathPattern.OPEN_ROOT_PATH_PATTERN : new PathPattern(path, PathPattern.RightHandPath.capturingZeroOrMoreSegments);
this.resourceMethods = resourceMethods;
this.subResourceLocator = subResourceLocator;
this.childResources = childResources;
this.handlerClasses = handlerClasses;
this.handlerInstances = handlerInstances;
}
@Override
public String getPath() {
return path;
}
@Override
public PathPattern getPathPattern() {
return pathPattern;
}
/**
* Get the resource name.
*
* If the resource was constructed from a JAX-RS annotated resource class,
* the resource name will be set to the {@link Class#getName() fully-qualified name}
* of the resource class.
*
* @return reference JAX-RS resource handler class.
*/
public String getName() {
if (name == null) {
if (names.size() == 1) {
name = names.get(0);
} else {
// return merged name
StringBuilder nameBuilder = new StringBuilder("Merge of ");
nameBuilder.append(names.toString());
name = nameBuilder.toString();
}
}
return name;
}
/**
* Return a list of resource names.
*
* @return a list of resource names.
*/
public List getNames() {
return Lists.newArrayList(names);
}
/**
* Provides a non-null list of resource methods available on the resource.
*
* @return non-null abstract resource method list.
*/
public List getResourceMethods() {
return resourceMethods;
}
/**
* Provides a resource locator available on the resource.
*
* @return Resource locator if it is present, null otherwise.
*/
public ResourceMethod getResourceLocator() {
return subResourceLocator;
}
/**
* Provides resource methods and resource locator are available on the resource. The list is ordered so that resource
* methods are positioned first before resource locator.
*
* @return List of resource methods and resource locator.
*/
public List getAllMethods() {
final LinkedList methodsAndLocators = Lists.newLinkedList(resourceMethods);
if (subResourceLocator != null) {
methodsAndLocators.add(subResourceLocator);
}
return methodsAndLocators;
}
/**
* Returns the list of child resources available on this resource.
*
* @return Non-null list of child resources (may be empty).
*/
public List getChildResources() {
return childResources;
}
/**
* Get the method handler classes for the resource methods registered on the resource.
*
* @return resource method handler classes.
*/
public Set> getHandlerClasses() {
return handlerClasses;
}
/**
* Get the method handler (singleton) instances for the resource methods registered
* on the resource.
*
* @return resource method handler instances.
*/
public Set getHandlerInstances() {
return handlerInstances;
}
private static class ChildResourceComponent implements ResourceModelComponent {
private final Resource childResource;
private ChildResourceComponent(Resource childResource) {
this.childResource = childResource;
}
@Override
public void accept(ResourceModelVisitor visitor) {
visitor.visitChildResource(childResource);
}
@Override
public List getComponents() {
List components = new LinkedList();
addResourceCommonComponents(childResource, components);
return components;
}
}
@Override
public void accept(ResourceModelVisitor visitor) {
visitor.visitResource(this);
}
@Override
public String toString() {
return "Resource{"
+ ((path == null) ? "[unbound], " : "\"" + path + "\", ")
+ childResources.size() + " child resources, "
+ resourceMethods.size() + " resource methods, "
+ (subResourceLocator == null ? "0" : "1") + " sub-resource locators, "
+ handlerClasses.size() + " method handler classes, "
+ handlerInstances.size() + " method handler instances"
+ '}';
}
@Override
public List getComponents() {
List components = new LinkedList();
components.addAll(Lists.transform(getChildResources(), new Function() {
@Override
public ChildResourceComponent apply(Resource childResource) {
return new ChildResourceComponent(childResource);
}
}));
addResourceCommonComponents(this, components);
return components;
}
private static void addResourceCommonComponents(Resource resource, List components) {
components.addAll(resource.getResourceMethods());
if (resource.getResourceLocator() != null) {
components.add(resource.getResourceLocator());
}
}
}
