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+// Copyright (C) 2012 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.extensions.restapi;
+
+import com.google.gerrit.extensions.annotations.Export;
+import com.google.gerrit.extensions.annotations.Exports;
+import com.google.gerrit.extensions.config.FactoryModule;
+import com.google.inject.Provider;
+import com.google.inject.TypeLiteral;
+import com.google.inject.binder.LinkedBindingBuilder;
+import com.google.inject.binder.ScopedBindingBuilder;
+
+/** Guice DSL for binding {@link RestView} implementations. */
+public abstract class RestApiModule extends FactoryModule {
+ protected static final String GET = "GET";
+ protected static final String PUT = "PUT";
+ protected static final String DELETE = "DELETE";
+ protected static final String POST = "POST";
+ protected static final String CREATE = "CREATE";
+ protected static final String DELETE_MISSING = "DELETE_MISSING";
+ protected static final String DELETE_ON_COLLECTION = "DELETE_ON_COLLECTION";
+ protected static final String POST_ON_COLLECTION = "POST_ON_COLLECTION";
+
+ protected <R extends RestResource> ReadViewBinder<R> get(TypeLiteral<RestView<R>> viewType) {
+ return get(viewType, "/");
+ }
+
+ protected <R extends RestResource> ModifyViewBinder<R> put(TypeLiteral<RestView<R>> viewType) {
+ return put(viewType, "/");
+ }
+
+ protected <R extends RestResource> ModifyViewBinder<R> post(TypeLiteral<RestView<R>> viewType) {
+ return post(viewType, "/");
+ }
+
+ protected <R extends RestResource> ModifyViewBinder<R> delete(TypeLiteral<RestView<R>> viewType) {
+ return delete(viewType, "/");
+ }
+
+ protected <R extends RestResource> RestCollectionViewBinder<R> postOnCollection(
+ TypeLiteral<RestView<R>> viewType) {
+ return new RestCollectionViewBinder<>(
+ bind(viewType).annotatedWith(export(POST_ON_COLLECTION, "/")));
+ }
+
+ /**
+ * Creates a binder that allows to bind a REST view to handle {@code DELETE} on the REST
+ * collection of the provided view type.
+ *
+ * <p>This binding is ignored if the provided view type belongs to a root collection.
+ *
+ * @param viewType the type of the resources in the REST collection on which {@code DELETE} should
+ * be handled
+ * @return binder that allows to bind an implementation for the REST view that should handle
+ * {@code DELETE} on the REST collection of the provided view type
+ */
+ protected <R extends RestResource> RestCollectionViewBinder<R> deleteOnCollection(
+ TypeLiteral<RestView<R>> viewType) {
+ return new RestCollectionViewBinder<>(
+ bind(viewType).annotatedWith(export(DELETE_ON_COLLECTION, "/")));
+ }
+
+ protected <R extends RestResource> CreateViewBinder<R> create(TypeLiteral<RestView<R>> viewType) {
+ return new CreateViewBinder<>(bind(viewType).annotatedWith(export(CREATE, "/")));
+ }
+
+ protected <R extends RestResource> DeleteViewBinder<R> deleteMissing(
+ TypeLiteral<RestView<R>> viewType) {
+ return new DeleteViewBinder<>(bind(viewType).annotatedWith(export(DELETE_MISSING, "/")));
+ }
+
+ protected <R extends RestResource> ReadViewBinder<R> get(
+ TypeLiteral<RestView<R>> viewType, String name) {
+ return new ReadViewBinder<>(view(viewType, GET, name));
+ }
+
+ protected <R extends RestResource> ModifyViewBinder<R> put(
+ TypeLiteral<RestView<R>> viewType, String name) {
+ return new ModifyViewBinder<>(view(viewType, PUT, name));
+ }
+
+ protected <R extends RestResource> ModifyViewBinder<R> post(
+ TypeLiteral<RestView<R>> viewType, String name) {
+ return new ModifyViewBinder<>(view(viewType, POST, name));
+ }
+
+ protected <R extends RestResource> ModifyViewBinder<R> delete(
+ TypeLiteral<RestView<R>> viewType, String name) {
+ return new ModifyViewBinder<>(view(viewType, DELETE, name));
+ }
+
+ protected <P extends RestResource> ChildCollectionBinder<P> child(
+ TypeLiteral<RestView<P>> type, String name) {
+ return new ChildCollectionBinder<>(view(type, GET, name));
+ }
+
+ private <R extends RestResource> LinkedBindingBuilder<RestView<R>> view(
+ TypeLiteral<RestView<R>> viewType, String method, String name) {
+ return bind(viewType).annotatedWith(export(method, name));
+ }
+
+ private static Export export(String method, String name) {
+ if (name.length() > 1 && name.startsWith("/")) {
+ // Views may be bound as "/" to mean the resource itself, or
+ // as "status" as in "/type/{id}/status". Don't bind "/status"
+ // if the caller asked for that, bind what the server expects.
+ name = name.substring(1);
+ }
+ return Exports.named(method + "." + name);
+ }
+
+ public static class ReadViewBinder<P extends RestResource> {
+ private final LinkedBindingBuilder<RestView<P>> binder;
+
+ private ReadViewBinder(LinkedBindingBuilder<RestView<P>> binder) {
+ this.binder = binder;
+ }
+
+ public <T extends RestReadView<P>> ScopedBindingBuilder to(Class<T> impl) {
+ return binder.to(impl);
+ }
+
+ public <T extends RestReadView<P>> void toInstance(T impl) {
+ binder.toInstance(impl);
+ }
+
+ public <T extends RestReadView<P>> ScopedBindingBuilder toProvider(
+ Class<? extends Provider<? extends T>> providerType) {
+ return binder.toProvider(providerType);
+ }
+
+ public <T extends RestReadView<P>> ScopedBindingBuilder toProvider(
+ Provider<? extends T> provider) {
+ return binder.toProvider(provider);
+ }
+ }
+
+ public static class ModifyViewBinder<P extends RestResource> {
+ private final LinkedBindingBuilder<RestView<P>> binder;
+
+ private ModifyViewBinder(LinkedBindingBuilder<RestView<P>> binder) {
+ this.binder = binder;
+ }
+
+ public <T extends RestModifyView<P, ?>> ScopedBindingBuilder to(Class<T> impl) {
+ return binder.to(impl);
+ }
+
+ public <T extends RestModifyView<P, ?>> void toInstance(T impl) {
+ binder.toInstance(impl);
+ }
+
+ public <T extends RestModifyView<P, ?>> ScopedBindingBuilder toProvider(
+ Class<? extends Provider<? extends T>> providerType) {
+ return binder.toProvider(providerType);
+ }
+
+ public <T extends RestModifyView<P, ?>> ScopedBindingBuilder toProvider(
+ Provider<? extends T> provider) {
+ return binder.toProvider(provider);
+ }
+ }
+
+ public static class RestCollectionViewBinder<C extends RestResource> {
+ private final LinkedBindingBuilder<RestView<C>> binder;
+
+ private RestCollectionViewBinder(LinkedBindingBuilder<RestView<C>> binder) {
+ this.binder = binder;
+ }
+
+ public <P extends RestResource, T extends RestCollectionModifyView<P, C, ?>>
+ ScopedBindingBuilder to(Class<T> impl) {
+ return binder.to(impl);
+ }
+
+ public <P extends RestResource, T extends RestCollectionModifyView<P, C, ?>> void toInstance(
+ T impl) {
+ binder.toInstance(impl);
+ }
+
+ public <P extends RestResource, T extends RestCollectionModifyView<P, C, ?>>
+ ScopedBindingBuilder toProvider(Class<? extends Provider<? extends T>> providerType) {
+ return binder.toProvider(providerType);
+ }
+
+ public <P extends RestResource, T extends RestCollectionModifyView<P, C, ?>>
+ ScopedBindingBuilder toProvider(Provider<? extends T> provider) {
+ return binder.toProvider(provider);
+ }
+ }
+
+ public static class CreateViewBinder<C extends RestResource> {
+ private final LinkedBindingBuilder<RestView<C>> binder;
+
+ private CreateViewBinder(LinkedBindingBuilder<RestView<C>> binder) {
+ this.binder = binder;
+ }
+
+ public <P extends RestResource, T extends RestCollectionCreateView<P, C, ?>>
+ ScopedBindingBuilder to(Class<T> impl) {
+ return binder.to(impl);
+ }
+
+ public <P extends RestResource, T extends RestCollectionCreateView<P, C, ?>> void toInstance(
+ T impl) {
+ binder.toInstance(impl);
+ }
+
+ public <P extends RestResource, T extends RestCollectionCreateView<P, C, ?>>
+ ScopedBindingBuilder toProvider(Class<? extends Provider<? extends T>> providerType) {
+ return binder.toProvider(providerType);
+ }
+
+ public <P extends RestResource, T extends RestCollectionCreateView<P, C, ?>>
+ ScopedBindingBuilder toProvider(Provider<? extends T> provider) {
+ return binder.toProvider(provider);
+ }
+ }
+
+ public static class DeleteViewBinder<C extends RestResource> {
+ private final LinkedBindingBuilder<RestView<C>> binder;
+
+ private DeleteViewBinder(LinkedBindingBuilder<RestView<C>> binder) {
+ this.binder = binder;
+ }
+
+ public <P extends RestResource, T extends RestCollectionDeleteMissingView<P, C, ?>>
+ ScopedBindingBuilder to(Class<T> impl) {
+ return binder.to(impl);
+ }
+
+ public <P extends RestResource, T extends RestCollectionDeleteMissingView<P, C, ?>>
+ void toInstance(T impl) {
+ binder.toInstance(impl);
+ }
+
+ public <P extends RestResource, T extends RestCollectionDeleteMissingView<P, C, ?>>
+ ScopedBindingBuilder toProvider(Class<? extends Provider<? extends T>> providerType) {
+ return binder.toProvider(providerType);
+ }
+
+ public <P extends RestResource, T extends RestCollectionDeleteMissingView<P, C, ?>>
+ ScopedBindingBuilder toProvider(Provider<? extends T> provider) {
+ return binder.toProvider(provider);
+ }
+ }
+
+ public static class ChildCollectionBinder<P extends RestResource> {
+ private final LinkedBindingBuilder<RestView<P>> binder;
+
+ private ChildCollectionBinder(LinkedBindingBuilder<RestView<P>> binder) {
+ this.binder = binder;
+ }
+
+ public <C extends RestResource, T extends ChildCollection<P, C>> ScopedBindingBuilder to(
+ Class<T> impl) {
+ return binder.to(impl);
+ }
+
+ public <C extends RestResource, T extends ChildCollection<P, C>> void toInstance(T impl) {
+ binder.toInstance(impl);
+ }
+
+ public <C extends RestResource, T extends ChildCollection<P, C>>
+ ScopedBindingBuilder toProvider(Class<? extends Provider<? extends T>> providerType) {
+ return binder.toProvider(providerType);
+ }
+
+ public <C extends RestResource, T extends ChildCollection<P, C>>
+ ScopedBindingBuilder toProvider(Provider<? extends T> provider) {
+ return binder.toProvider(provider);
+ }
+ }
+}