Add ContentViewDelegate

android_webview/native/aw_contents_io_thread_client.h

+// Copyright (c) 2012 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.
+
+#ifndef ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_IO_THREAD_CLIENT_H_
+#define ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_IO_THREAD_CLIENT_H_
+
+#include "base/android/scoped_java_ref.h"
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+class GURL;
+class InterceptedRequestData;
+class JavaDelegateMapMaintainer;
+
+namespace content {
+class WebContents;
+}
+
+namespace net {
+class URLRequest;
+}
+
+namespace android_webview {
+
+// This class provides a means of calling Java methods on an instance that has
+// a 1:1 relationship with a WebContents instance directly from the IO thread.
+//
+// Specifically this is used to implement URLRequest intercepting in a way that
+// lets the embedder associate URLRequests with the WebContents that the
+// URLRequest is made for.
+//
+// The native class is intended to be a short-lived handle that pins the
+// Java-side instance. It is preferable to use the static getter methods to
+// obtain a new instance of the class rather than holding on to one for
+// prolonged periods of time (see note for more details).
+//
+// Note: The native AwContentsIoThreadClient instance has a Global ref to
+// the Java object. By keeping the native AwContentsIoThreadClient
+// instance alive you're also prolonging the lifetime of the Java instance, so
+// don't keep a AwContentsIoThreadClient if you don't need to.
+class AwContentsIoThreadClient {
+ public:
+  // This will attempt to fetch the AwContentsIoThreadClient for the given
+  // |render_process_id|, |render_view_id| pair.
+  // This method can be called from any thread.
+  // An empty scoped_ptr is a valid return value.
+  static AwContentsIoThreadClient FromID(int render_process_id,
+                                         int render_view_id);
+
+  // Associates the |jclient| instance (which must implement the
+  // AwContentsIoThreadClient Java interface) with the |web_contents|.
+  // This should be called at most once per |web_contents|.
+  static void Associate(content::WebContents* web_contents,
+                        const base::android::JavaRef<jobject>& jclient);
+
+  AwContentsIoThreadClient(const AwContentsIoThreadClient& orig);
+  ~AwContentsIoThreadClient();
+  void operator=(const AwContentsIoThreadClient& rhs);
+
+  // This method is called on the IO thread only.
+  scoped_ptr<InterceptedRequestData> ShouldInterceptRequest(
+      const net::URLRequest* request);
+
+ private:
+  AwContentsIoThreadClient();
+  AwContentsIoThreadClient(const base::android::JavaRef<jobject>& jclient);
+
+  base::android::ScopedJavaGlobalRef<jobject> java_object_;
+};
+
+// JNI registration method.
+bool RegisterAwContentsIoThreadClient(JNIEnv* env);
+
+
+} // namespace android_webview
+
+#endif  // ANDROID_WEBVIEW_NATIVE_AW_CONTENTS_IO_THREAD_CLIENT_H_