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// Copyright (c) 2010 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 CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
#define CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
#include <string>
#include "base/basictypes.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "chrome/common/net/url_fetcher.h"
#include "chrome/common/speech_input_result.h"
#include "googleurl/src/gurl.h"
class URLFetcher;
class URLRequestContextGetter;
namespace speech_input {
// Provides a simple interface for sending recorded speech data to the server
// and get back recognition results.
class SpeechRecognitionRequest : public URLFetcher::Delegate {
public:
// ID passed to URLFetcher::Create(). Used for testing.
static int url_fetcher_id_for_tests;
// Interface for receiving callbacks from this object.
class Delegate {
public:
virtual void SetRecognitionResult(
bool error, const SpeechInputResultArray& result) = 0;
protected:
virtual ~Delegate() {}
};
// |url| is the server address to which the request wil be sent.
SpeechRecognitionRequest(URLRequestContextGetter* context,
Delegate* delegate);
virtual ~SpeechRecognitionRequest();
// Sends a new request with the given audio data, returns true if successful.
// The same object can be used to send multiple requests but only after the
// previous request has completed.
bool Send(const std::string& language,
const std::string& grammar,
const std::string& hardware_info,
const std::string& content_type,
const std::string& audio_data);
bool HasPendingRequest() { return url_fetcher_ != NULL; }
// URLFetcher::Delegate methods.
void OnURLFetchComplete(const URLFetcher* source,
const GURL& url,
const URLRequestStatus& status,
int response_code,
const ResponseCookies& cookies,
const std::string& data);
private:
scoped_refptr<URLRequestContextGetter> url_context_;
Delegate* delegate_;
scoped_ptr<URLFetcher> url_fetcher_;
DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionRequest);
};
// This typedef is to workaround the issue with certain versions of
// Visual Studio where it gets confused between multiple Delegate
// classes and gives a C2500 error. (I saw this error on the try bots -
// the workaround was not needed for my machine).
typedef SpeechRecognitionRequest::Delegate SpeechRecognitionRequestDelegate;
} // namespace speech_input
#endif // CHROME_BROWSER_SPEECH_SPEECH_RECOGNITION_REQUEST_H_
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