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+/*
+ * Copyright (C) 2012 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebSpeechRecognizerClient_h
+#define WebSpeechRecognizerClient_h
+
+#include "../platform/WebVector.h"
+
+namespace WebKit {
+
+class WebSpeechRecognitionResult;
+class WebSpeechRecognitionHandle;
+class WebString;
+
+// A client for reporting progress on speech recognition for a specific handle.
+class WebSpeechRecognizerClient {
+public:
+    enum ErrorCode {
+        OtherError = 0,
+        NoSpeechError = 1,
+        AbortedError = 2,
+        AudioCaptureError = 3,
+        NetworkError = 4,
+        NotAllowedError = 5,
+        ServiceNotAllowedError = 6,
+        BadGrammarError = 7,
+        LanguageNotSupportedError = 8
+    };
+
+    // These methods correspond to the events described in the spec:
+    // http://speech-javascript-api-spec.googlecode.com/git/speechapi.html#speechreco-events
+
+    // To be called when the embedder has started to capture audio.
+    virtual void didStartAudio(const WebSpeechRecognitionHandle&) = 0;
+
+    // To be called when some sound, possibly speech, has been detected.
+    // This is expected to be called after didStartAudio.
+    virtual void didStartSound(const WebSpeechRecognitionHandle&) = 0;
+
+    // To be called when sound is no longer detected.
+    // This is expected to be called after didEndSpeech.
+    virtual void didEndSound(const WebSpeechRecognitionHandle&) = 0;
+
+    // To be called when audio capture has stopped.
+    // This is expected to be called after didEndSound.
+    virtual void didEndAudio(const WebSpeechRecognitionHandle&) = 0;
+
+    // To be called when the speech recognizer provides new results.
+    // - newFinalResults contains zero or more final results that are new since
+    // the last time the function was called.
+    // - currentInterimResults contains zero or more inteirm results that
+    // replace the interim results that were reported the last time this
+    // function was called.
+    virtual void didReceiveResults(const WebSpeechRecognitionHandle&, const WebVector<WebSpeechRecognitionResult>& newFinalResults, const WebVector<WebSpeechRecognitionResult>& currentInterimResults) = 0;
+
+    // To be called when the speech recognizer returns a final result with no
+    // recognizion hypothesis.
+    virtual void didReceiveNoMatch(const WebSpeechRecognitionHandle&, const WebSpeechRecognitionResult&) = 0;
+
+    // To be called when a speech recognition error occurs.
+    virtual void didReceiveError(const WebSpeechRecognitionHandle&, const WebString& message, ErrorCode) = 0;
+
+    // To be called when the recognizer has begun to listen to the audio with
+    // the intention of recognizing.
+    virtual void didStart(const WebSpeechRecognitionHandle&) = 0;
+
+    // To be called when the recognition session has ended. This must always be
+    // called, no matter the reason for the end.
+    virtual void didEnd(const WebSpeechRecognitionHandle&) = 0;
+
+protected:
+    virtual ~WebSpeechRecognizerClient() {}
+};
+
+} // namespace WebKit
+
+#endif // WebSpeechRecognizerClient_h