WIP: Reduce code size of InterfacePtrState

mojo/public/cpp/bindings/lib/interface_ptr_state.cc

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/public/cpp/bindings/lib/interface_ptr_state.h"
+
+namespace mojo {
+namespace internal {
+
+SimpleInterfacePtrState::SimpleInterfacePtrState()
+    : router_(nullptr), version_(0u) {}
+
+SimpleInterfacePtrState::~SimpleInterfacePtrState() {
+  delete router_;
+}
+
+void SimpleInterfacePtrState::QueryVersion(
+    const base::Callback<void(uint32_t)>& callback) {
+  ConfigureProxyIfNecessary();
+
+  // It is safe to capture |this| because the callback won't be run after this
+  // object goes away.
+  proxy()->QueryVersion(base::Bind(&SimpleInterfacePtrState::OnQueryVersion,
+                                   base::Unretained(this), callback));
+}
+
+void SimpleInterfacePtrState::RequireVersion(uint32_t version) {
+  ConfigureProxyIfNecessary();
+
+  if (version <= version_)
+    return;
+
+  version_ = version;
+  proxy()->RequireVersion(version);
+}
+
+bool SimpleInterfacePtrState::HasAssociatedInterfaces() const {
+  return false;
+}
+
+void SimpleInterfacePtrState::EnableTestingMode() {
+  ConfigureProxyIfNecessary();
+  router_->EnableTestingMode();
+}
+
+void SimpleInterfacePtrState::BindInternal(
+    InterfacePtrInfoBase* info,
+    scoped_refptr<base::SingleThreadTaskRunner> runner) {
+  DCHECK(!router_);
+  DCHECK(!handle_.is_valid());
+  DCHECK_EQ(0u, version_);
+  DCHECK(info->is_valid());
+
+  handle_ = info->PassHandle();
+  version_ = info->version();
+  runner_ = std::move(runner);
+}
+
+bool SimpleInterfacePtrState::ConfigureProxyIfNecessaryInternal(
+    const char* interface_name) {
+  // The object hasn't been bound.
+  if (!handle_.is_valid())
+    return false;
+
+  FilterChain filters;
+  filters.Append<MessageHeaderValidator>(interface_name);
+  filters.Append(CreateRequestValidator());
+
+  router_ = new Router(std::move(handle_), std::move(filters), false,
+                       std::move(runner_));
+  return true;
+}
+
+void SimpleInterfacePtrState::OnQueryVersion(
+    const base::Callback<void(uint32_t)>& callback,
+    uint32_t version) {
+  version_ = version;
+  callback.Run(version);
+}
+
+}  // namespace internal
+}  // namespace mojo