Add an option to generate API calls using a DbxRequest wrapper

core/api/core.api

@@ -135,6 +135,10 @@ public class com/dropbox/core/DbxPKCEWebAuth {
 	public fun finishFromRedirect (Ljava/lang/String;Lcom/dropbox/core/DbxSessionStore;Ljava/util/Map;)Lcom/dropbox/core/DbxAuthFinish;
 }
 
+public abstract interface class com/dropbox/core/DbxRequest {
+	public abstract fun call ()Ljava/lang/Object;
+}
+
 public class com/dropbox/core/DbxRequestConfig {
 	public fun <init> (Ljava/lang/String;)V
 	public fun <init> (Ljava/lang/String;Ljava/lang/String;)V

core/build.gradle

@@ -306,6 +306,7 @@ tasks.named("generateTestStone", StoneTask) {
             ),
             new StoneConfig(
                     packageName: packageName,
+                    callRequest: true,
                     client: new ClientSpec(
                             name: 'DbxClientV2Base',
                             javadoc: 'TestClass.',

core/build/generated_stone_source/test/src/com/dropbox/core/stone/test/DbxTestTestRequests.java

@@ -6,6 +6,7 @@
 import com.dropbox.core.DbxApiException;
 import com.dropbox.core.DbxDownloader;
 import com.dropbox.core.DbxException;
+import com.dropbox.core.DbxRequest;
 import com.dropbox.core.DbxUploader;
 import com.dropbox.core.DbxWrappedException;
 import com.dropbox.core.http.HttpRequestor;
@@ -77,6 +78,21 @@ public DbxDownloader<Fish> testDownload(String name, String breed) throws DbxApi
         return testDownload(_arg, Collections.<HttpRequestor.Header>emptyList());
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testDownload(String,String)}.
+     *
+     * @param name  Used in {@link
+     *     DbxTestTestRequests#testRouteV2(String,Date)}. Must not be {@code
+     *     null}.
+     * @param breed  Must not be {@code null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code DbxDownloader&lt;Fish&gt;}.
+     */
+    public DbxRequest<DbxDownloader<Fish>> testDownloadRequest(String name, String breed) {
+        return () -> testDownload(name, breed);
+    }
+
     /**
      *
      * @param name  Used in {@link
@@ -138,6 +154,20 @@ public DbxDownloader<Fish> testDownloadV2(UninitializedReason reason, String ses
         return testDownloadV2(_arg, Collections.<HttpRequestor.Header>emptyList());
     }
 
+    /**
+     * See {@link
+     * DbxTestTestRequests#testDownloadV2(UninitializedReason,String)}.
+     *
+     * @param reason  Must not be {@code null}.
+     * @param sessionId  Must not be {@code null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code DbxDownloader&lt;Fish&gt;}.
+     */
+    public DbxRequest<DbxDownloader<Fish>> testDownloadV2Request(UninitializedReason reason, String sessionId) {
+        return () -> testDownloadV2(reason, sessionId);
+    }
+
     /**
      *
      * @param reason  Must not be {@code null}.
@@ -175,6 +205,15 @@ public void testRoute() throws DbxApiException, DbxException {
         }
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testRoute}.
+     *
+     * @return A {@link DbxRequest} that can be executed later.
+     */
+    public DbxRequest<java.lang.Void> testRouteRequest() {
+        return () -> { testRoute(); return null; };
+    }
+
     //
     // route 2/test/test_route_v2
     //
@@ -211,6 +250,19 @@ public void testRouteV2(String name) throws ParentUnionException, DbxException {
         testRouteV2(_arg);
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testRouteV2(String,Date)}.
+     *
+     * @param name  Used in {@link
+     *     DbxTestTestRequests#testRouteV2(String,Date)}. Must not be {@code
+     *     null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later.
+     */
+    public DbxRequest<java.lang.Void> testRouteV2Request(String name) {
+        return () -> { testRouteV2(name); return null; };
+    }
+
     /**
      *
      * @param name  Used in {@link
@@ -225,6 +277,19 @@ public void testRouteV2(String name, Date born) throws ParentUnionException, Dbx
         testRouteV2(_arg);
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testRouteV2(String,Date)}.
+     *
+     * @param name  Used in {@link
+     *     DbxTestTestRequests#testRouteV2(String,Date)}. Must not be {@code
+     *     null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later.
+     */
+    public DbxRequest<java.lang.Void> testRouteV2Request(String name, Date born) {
+        return () -> { testRouteV2(name, born); return null; };
+    }
+
     //
     // route 2/test/test_upload
     //
@@ -258,6 +323,19 @@ public TestUploadUploader testUpload(UninitializedReason reason, String sessionI
         return testUpload(_arg);
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testUpload(UninitializedReason,String)}.
+     *
+     * @param reason  Must not be {@code null}.
+     * @param sessionId  Must not be {@code null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code TestUploadUploader}.
+     */
+    public DbxRequest<TestUploadUploader> testUploadRequest(UninitializedReason reason, String sessionId) {
+        return () -> testUpload(reason, sessionId);
+    }
+
     //
     // route 2/test/test_upload_v2
     //
@@ -293,6 +371,21 @@ public TestUploadV2Uploader testUploadV2(String name, String breed) throws DbxEx
         return testUploadV2(_arg);
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testUploadV2(String,String)}.
+     *
+     * @param name  Used in {@link
+     *     DbxTestTestRequests#testRouteV2(String,Date)}. Must not be {@code
+     *     null}.
+     * @param breed  Must not be {@code null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code TestUploadV2Uploader}.
+     */
+    public DbxRequest<TestUploadV2Uploader> testUploadV2Request(String name, String breed) {
+        return () -> testUploadV2(name, breed);
+    }
+
     /**
      *
      * @param name  Used in {@link
@@ -346,6 +439,21 @@ public TestUploadV3Uploader testUploadV3(String name, String breed) throws DbxEx
         return testUploadV3(_arg);
     }
 
+    /**
+     * See {@link DbxTestTestRequests#testUploadV3(String,String)}.
+     *
+     * @param name  Used in {@link
+     *     DbxTestTestRequests#testRouteV2(String,Date)}. Must not be {@code
+     *     null}.
+     * @param breed  Must not be {@code null}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code TestUploadV3Uploader}.
+     */
+    public DbxRequest<TestUploadV3Uploader> testUploadV3Request(String name, String breed) {
+        return () -> testUploadV3(name, breed);
+    }
+
     /**
      *
      * @param name  Used in {@link

core/build/generated_stone_source/test/src/com/dropbox/core/stone/test/DbxTestTestUploadV3Builder.java

@@ -4,6 +4,7 @@
 package com.dropbox.core.stone.test;
 
 import com.dropbox.core.DbxException;
+import com.dropbox.core.DbxRequest;
 import com.dropbox.core.util.LangUtil;
 import com.dropbox.core.v2.DbxUploadStyleBuilder;
 
@@ -65,4 +66,14 @@ public TestUploadV3Uploader start() throws ParentUnionException, DbxException {
         Dog arg_ = this._builder.build();
         return _client.testUploadV3(arg_);
     }
+
+    /**
+     * See {@link DbxTestTestRequests#testUploadV3(String,String)}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code TestUploadV3Uploader}.
+     */
+    public DbxRequest<TestUploadV3Uploader> startRequest() {
+        return () -> start();
+    }
 }

core/build/generated_stone_source/test/src/com/dropbox/core/stone/test/TestDownloadBuilder.java

@@ -6,6 +6,7 @@
 import com.dropbox.core.DbxApiException;
 import com.dropbox.core.DbxDownloader;
 import com.dropbox.core.DbxException;
+import com.dropbox.core.DbxRequest;
 import com.dropbox.core.util.LangUtil;
 import com.dropbox.core.v2.DbxDownloadStyleBuilder;
 
@@ -67,4 +68,14 @@ public DbxDownloader<Fish> start() throws DbxApiException, DbxException {
         Dog arg_ = this._builder.build();
         return _client.testDownload(arg_, getHeaders());
     }
+
+    /**
+     * See {@link DbxTestTestRequests#testDownload(String,String)}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code DbxDownloader&lt;Fish&gt;}.
+     */
+    public DbxRequest<DbxDownloader<Fish>> startRequest() {
+        return () -> start();
+    }
 }

core/build/generated_stone_source/test/src/com/dropbox/core/stone/test/TestDownloadV2Builder.java

@@ -5,6 +5,7 @@
 
 import com.dropbox.core.DbxDownloader;
 import com.dropbox.core.DbxException;
+import com.dropbox.core.DbxRequest;
 import com.dropbox.core.v2.DbxDownloadStyleBuilder;
 
 /**
@@ -46,4 +47,15 @@ public DbxDownloader<Fish> start() throws ParentUnionException, DbxException {
         Uninitialized arg_ = new Uninitialized(reason, sessionId);
         return _client.testDownloadV2(arg_, getHeaders());
     }
+
+    /**
+     * See {@link
+     * DbxTestTestRequests#testDownloadV2(UninitializedReason,String)}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code DbxDownloader&lt;Fish&gt;}.
+     */
+    public DbxRequest<DbxDownloader<Fish>> startRequest() {
+        return () -> start();
+    }
 }

core/build/generated_stone_source/test/src/com/dropbox/core/stone/test/TestUploadV2Builder.java

@@ -4,6 +4,7 @@
 package com.dropbox.core.stone.test;
 
 import com.dropbox.core.DbxException;
+import com.dropbox.core.DbxRequest;
 import com.dropbox.core.util.LangUtil;
 import com.dropbox.core.v2.DbxUploadStyleBuilder;
 
@@ -65,4 +66,14 @@ public TestUploadV2Uploader start() throws ParentUnionException, DbxException {
         Dog arg_ = this._builder.build();
         return _client.testUploadV2(arg_);
     }
+
+    /**
+     * See {@link DbxTestTestRequests#testUploadV2(String,String)}.
+     *
+     * @return A {@link DbxRequest} that can be executed later to obtain the
+     *     {@code TestUploadV2Uploader}.
+     */
+    public DbxRequest<TestUploadV2Uploader> startRequest() {
+        return () -> start();
+    }
 }

core/generator/java/java.stoneg.py

@@ -621,6 +621,8 @@ def __lt__(self, other):
                                   'exist.')
 _CMDLINE_PARSER.add_argument('--unused-classes-to-generate', default=None, help='Specify types ' +
                                                                                 'that we want to generate regardless of whether they are used.')
+_CMDLINE_PARSER.add_argument('--call-request', action="store_true", default=False,
+                             help='Generate additional *Request methods that return DbxRequest<T>.')
 
 
 class JavaCodeGenerator(CodeBackend):
@@ -729,6 +731,8 @@ def add_imports_for_namespace(self, namespace):
             'java.util.HashMap',
             'java.util.Map',
         )
+        if self._j._args.call_request:
+            self.add_imports('com.dropbox.core.DbxRequest')
         for route in namespace.routes:
             self.add_imports_for_route(route)
 
@@ -795,6 +799,9 @@ def add_imports_for_route_builder(self, route):
         elif j.request_style(route) == 'upload':
             self.add_imports('com.dropbox.core.v2.DbxUploadStyleBuilder')
 
+        if self._j._args.call_request:
+            self.add_imports('com.dropbox.core.DbxRequest')
+
     def add_imports_for_route_uploader(self, route):
         self.add_imports(
             'com.dropbox.core.DbxWrappedException',
@@ -2800,6 +2807,12 @@ def generate_route_base(self, route, force_public=False):
             else:
                 assert False, "unrecognized route request style: %s" % j.request_style(route)
 
+        if is_public and self.g.args.call_request:
+            request_args = w.fmt('%s arg', j.java_class(route.arg_data_type)) if j.has_arg(route) else ''
+            request_arg_names = 'arg' if j.has_arg(route) else ''
+            self._emit_request_method_body(route, request_args, request_arg_names, return_class,
+                                           params=params)
+
     def generate_route(self, route, required_only=True):
         assert isinstance(route, ApiRoute), repr(route)
 
@@ -2914,6 +2927,15 @@ def generate_route(self, route, required_only=True):
             else:
                 w.out('%s(_arg);', j.route_method(route))
 
+        if self.g.args.call_request:
+            request_args = ', '.join(
+                w.fmt('%s %s', j.java_class(f), j.param_name(f)) for f in fields
+            )
+            request_arg_names = ', '.join(j.param_name(f) for f in fields)
+            request_params = w._javadoc_fields(fields, route, allow_defaults=False)
+            self._emit_request_method_body(route, request_args, request_arg_names, return_class,
+                                           params=request_params)
+
     def generate_route_builder_method(self, route):
         assert isinstance(route, ApiRoute), repr(route)
 
@@ -2953,6 +2975,40 @@ def generate_route_builder_method(self, route):
             else:
                 w.out('return new %s(this, %s);', return_class, builder_args)
 
+    def _emit_request_method_body(self, route, args, arg_names, return_class,
+                                   fields=(), params=(), method_name=None, delegate=None):
+        """Emit the request method signature and body."""
+        w = self.w
+        j = self.j
+
+        if return_class == JavaClass('void'):
+            boxed_return = JavaClass('java.lang.Void')
+        else:
+            boxed_return = return_class
+
+        request_class = JavaClass('com.dropbox.core.DbxRequest', generics=(boxed_return,))
+        if method_name is None:
+            method_name = j.route_method(route) + 'Request'
+        if delegate is None:
+            delegate = '%s(%s)' % (j.route_method(route), arg_names)
+
+        w.out('')
+        dbx_request_ref = w.javadoc_ref(JavaClass('com.dropbox.core.DbxRequest'))
+        if return_class == JavaClass('void'):
+            returns_doc = "A %s that can be executed later." % dbx_request_ref
+        else:
+            result_type = w.resolved_class(boxed_return, generics=True)
+            returns_doc = "A %s that can be executed later to obtain the {@code %s}." % (
+                dbx_request_ref, result_type,
+            )
+        doc = "See %s." % w.javadoc_ref(route)
+        w.javadoc(doc, params=params, returns=returns_doc)
+        with w.block('public %s %s(%s)', request_class, method_name, args):
+            if return_class == JavaClass('void'):
+                w.out('return () -> { %s; return null; };', delegate)
+            else:
+                w.out('return () -> %s;', delegate)
+
     def translate_error_wrapper(self, route, error_wrapper_var):
         assert isinstance(route, ApiRoute), repr(route)
         assert isinstance(error_wrapper_var, str), repr(error_wrapper_var)
@@ -3848,6 +3904,10 @@ def generate_route_builder(self, route):
                     else:
                         w.out('_client.%s(%s);', j.route_method(route), ', '.join(args))
 
+                if self.g.args.call_request:
+                    self._emit_request_method_body(route, '', '', return_class,
+                                                   method_name='startRequest', delegate='start()')
+
     def generate_field_assignment(self, field, lhs=None, rhs=None, allow_default=True):
         assert isinstance(field, Field), repr(field)