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package org.glassfish.jersey.server.model.internal;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import javax.ws.rs.HttpMethod;
import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import org.glassfish.jersey.process.Inflector;
import org.glassfish.jersey.server.model.Resource;
import org.glassfish.jersey.server.model.ResourceMethod;
import org.glassfish.jersey.server.model.ResourceModel;
import org.glassfish.jersey.server.model.RuntimeResource;
import jersey.repackaged.com.google.common.collect.Sets;
/**
* Helper class with methods supporting processing resource model by {@link org.glassfish.jersey.server.model.ModelProcessor
* model processors}.
*
* @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
* @author Michal Gajdos (michal.gajdos at oracle.com)
*/
public class ModelProcessorUtil {
/**
* Return allowed methods for the given {@code resource}. OPTIONS and HEAD are always returned in the result.
*
* @param resource Resource for which resource methods should be found.
* @return Set of resource methods that can be invoked on the given resource.
*/
public static Set<String> getAllowedMethods(RuntimeResource resource) {
boolean getFound = false;
Set<String> allowedMethods = Sets.newHashSet();
for (ResourceMethod resourceMethod : resource.getResourceMethods()) {
final String httpMethod = resourceMethod.getHttpMethod();
allowedMethods.add(httpMethod);
if (!getFound && httpMethod.equals(HttpMethod.GET)) {
getFound = true;
}
}
allowedMethods.add(HttpMethod.OPTIONS);
if (getFound) {
allowedMethods.add(HttpMethod.HEAD);
}
return allowedMethods;
}
private static boolean isMethodOverridden(ResourceMethod resourceMethod, String httpMethod, MediaType consumes,
MediaType produces) {
if (!resourceMethod.getHttpMethod().equals(httpMethod)) {
return false;
}
final boolean consumesMatch = overrides(resourceMethod.getConsumedTypes(), consumes);
final boolean producesMatch = overrides(resourceMethod.getProducedTypes(), produces);
return consumesMatch && producesMatch;
}
private static boolean overrides(List<MediaType> mediaTypes, MediaType mediaType) {
if (mediaTypes.isEmpty()) {
return true;
}
for (MediaType mt : mediaTypes) {
if (overrides(mt, mediaType)) {
return true;
}
}
return false;
}
private static boolean overrides(MediaType mt1, MediaType mt2) {
return mt1.isWildcardType()
|| (mt1.getType().equals(mt2.getType()) && (mt1.isWildcardSubtype() || mt1.getSubtype().equals(mt2.getSubtype()
)));
}
/**
* Method bean containing basic information about enhancing resource method.
*/
public static class Method {
private final String httpMethod;
private final String path;
private final List<MediaType> consumes;
private final List<MediaType> produces;
private final Class<? extends Inflector<ContainerRequestContext, Response>> inflectorClass;
private final Inflector<ContainerRequestContext, Response> inflector;
/**
* Create new method instance.
*
* @param path relative path of the method.
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media type.
* @param produces Produces media type.
* @param inflector Inflector handling the resource method.
*/
public Method(String path, String httpMethod, MediaType consumes, MediaType produces,
Class<? extends Inflector<ContainerRequestContext, Response>> inflector) {
this(path, httpMethod, Arrays.asList(consumes), Arrays.asList(produces), inflector);
}
/**
* Create new method instance.
*
* @param path relative path of the method.
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media types.
* @param produces Produces media types.
* @param inflectorClass Inflector handling the resource method.
*/
public Method(String path, String httpMethod, List<MediaType> consumes, List<MediaType> produces,
Class<? extends Inflector<ContainerRequestContext, Response>> inflectorClass) {
this.path = path;
this.httpMethod = httpMethod;
this.consumes = consumes;
this.produces = produces;
this.inflectorClass = inflectorClass;
this.inflector = null;
}
/**
* Create new method instance.
*
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media type.
* @param produces Produces media type.
* @param inflector Inflector handling the resource method.
*/
public Method(String httpMethod, MediaType consumes, MediaType produces,
Class<? extends Inflector<ContainerRequestContext, Response>> inflector) {
this(null, httpMethod, consumes, produces, inflector);
}
/**
* Create new method instance.
*
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media types.
* @param produces Produces media types.
* @param inflector Inflector handling the resource method.
*/
public Method(String httpMethod, List<MediaType> consumes, List<MediaType> produces,
Class<? extends Inflector<ContainerRequestContext, Response>> inflector) {
this(null, httpMethod, consumes, produces, inflector);
}
/**
* Create new method instance.
*
* @param path relative path of the method.
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media types.
* @param produces Produces media types.
* @param inflector Inflector handling the resource method.
*/
public Method(String path, String httpMethod, List<MediaType> consumes, List<MediaType> produces,
Inflector<ContainerRequestContext, Response> inflector) {
this.path = path;
this.httpMethod = httpMethod;
this.consumes = consumes;
this.produces = produces;
this.inflectorClass = null;
this.inflector = inflector;
}
/**
* Create new method instance.
*
* @param path relative path of the method.
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media type.
* @param produces Produces media type.
* @param inflector Inflector handling the resource method.
*/
public Method(String path, String httpMethod, MediaType consumes, MediaType produces,
Inflector<ContainerRequestContext, Response> inflector) {
this(path, httpMethod, Arrays.asList(consumes), Arrays.asList(produces), inflector);
}
/**
* Create new method instance.
*
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media type.
* @param produces Produces media type.
* @param inflector Inflector handling the resource method.
*/
public Method(String httpMethod, MediaType consumes, MediaType produces,
Inflector<ContainerRequestContext, Response> inflector) {
this(null, httpMethod, consumes, produces, inflector);
}
/**
* Create new method instance.
*
* @param httpMethod HTTP method (eg. GET, POST, OPTIONS).
* @param consumes Consumed media types.
* @param produces Produces media types.
* @param inflector Inflector handling the resource method.
*/
public Method(String httpMethod, List<MediaType> consumes, List<MediaType> produces,
Inflector<ContainerRequestContext, Response> inflector) {
this(null, httpMethod, consumes, produces, inflector);
}
}
/**
* Enhance {@code resourceModel} by list of methods. The {@code resourceModel} is traversed and for each available endpoint
* URI in the model {@code methods} are added. In case of method conflicts currently existing methods will
* never be 'overridden' by any method from {@code methods}. Overriding check takes into account media types of methods so
* that new resource methods with same HTTP method can define only more specific media type.
*
* @param resourceModel Resource model to be enhanced.
* @param subResourceModel {@code true} if the {@code resourceModel} to be enhanced is a sub resource model, {@code false}
* if it is application resource model.
* @param methods List of enhancing methods.
* @param extendedFlag This flag will initialize the property
* {@link org.glassfish.jersey.server.model.ResourceMethod#isExtended()}.
*
* @return New resource model builder enhanced by {@code methods}.
*/
public static ResourceModel.Builder enhanceResourceModel(ResourceModel resourceModel, boolean subResourceModel,
List<Method> methods, boolean extendedFlag) {
ResourceModel.Builder newModelBuilder = new ResourceModel.Builder(resourceModel, subResourceModel);
for (RuntimeResource resource : resourceModel.getRuntimeResourceModel().getRuntimeResources()) {
enhanceResource(resource, newModelBuilder, methods, extendedFlag);
}
return newModelBuilder;
}
public static void enhanceResource(RuntimeResource resource, ResourceModel.Builder newModelBuilder,
List<Method> methods, boolean extended) {
final Resource firstResource = resource.getResources().get(0);
if (methodsSuitableForResource(firstResource, methods)) {
for (Method method : methods) {
final Set<MediaType> produces = Sets.newHashSet(method.produces);
for (ResourceMethod resourceMethod : resource.getResourceMethods()) {
for (final MediaType produce : method.produces) {
if (ModelProcessorUtil.isMethodOverridden(
resourceMethod,
method.httpMethod,
method.consumes.get(0),
produce)) {
produces.remove(produce);
}
}
}
if (!produces.isEmpty()) {
final Resource parentResource = resource.getParentResources().get(0);
if (parentResource != null && method.path != null) {
continue;
}
final Resource.Builder resourceBuilder = Resource.builder(firstResource.getPath());
final Resource.Builder builder = method.path != null
? resourceBuilder.addChildResource(method.path) : resourceBuilder;
final ResourceMethod.Builder methodBuilder = builder
.addMethod(method.httpMethod)
.consumes(method.consumes)
.produces(produces);
if (method.inflector != null) {
methodBuilder.handledBy(method.inflector);
} else {
methodBuilder.handledBy(method.inflectorClass);
}
methodBuilder.extended(extended);
final Resource newResource = resourceBuilder.build();
if (parentResource != null) {
final Resource.Builder parentBuilder = Resource.builder(parentResource.getPath());
parentBuilder.addChildResource(newResource);
newModelBuilder.addResource(parentBuilder.build());
} else {
newModelBuilder.addResource(newResource);
}
}
}
}
for (RuntimeResource child : resource.getChildRuntimeResources()) {
enhanceResource(child, newModelBuilder, methods, extended);
}
}
/**
* Determines whether the given methods can enhance the resource.
*
* @param resource resource to add the methods to.
* @param methods methods to add.
* @return {@code true} if methods can enhance the resource, {@code false} otherwise.
*/
private static boolean methodsSuitableForResource(final Resource resource, final List<Method> methods) {
if (resource.getResourceMethods().size() > 0) {
return true;
}
// If there are no handler classes/instances we want to add only non-HEAD / non-OPTIONS methods.
if (resource.getHandlerInstances().isEmpty() && resource.getHandlerClasses().isEmpty()) {
for (final Method method : methods) {
if (!HttpMethod.HEAD.equals(method.httpMethod) && !HttpMethod.OPTIONS.equals(method.httpMethod)) {
return true;
}
}
}
return false;
}
}