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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions are
      6  * met:
      7  *
      8  *     * Redistributions of source code must retain the above copyright
      9  * notice, this list of conditions and the following disclaimer.
     10  *     * Redistributions in binary form must reproduce the above
     11  * copyright notice, this list of conditions and the following disclaimer
     12  * in the documentation and/or other materials provided with the
     13  * distribution.
     14  *     * Neither the name of Google Inc. nor the names of its
     15  * contributors may be used to endorse or promote products derived from
     16  * this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "modules/webmidi/MIDIAccessPromise.h"
     33 
     34 #include "core/dom/DOMError.h"
     35 #include "modules/webmidi/MIDIAccess.h"
     36 #include "modules/webmidi/MIDIErrorCallback.h"
     37 #include "modules/webmidi/MIDISuccessCallback.h"
     38 
     39 namespace WebCore {
     40 
     41 PassRefPtr<MIDIAccessPromise> MIDIAccessPromise::create(ExecutionContext* context, const Dictionary& options)
     42 {
     43     RefPtr<MIDIAccessPromise> midiAccessPromise(adoptRef(new MIDIAccessPromise(context, options)));
     44     midiAccessPromise->suspendIfNeeded();
     45     return midiAccessPromise.release();
     46 }
     47 
     48 MIDIAccessPromise::MIDIAccessPromise(ExecutionContext* context, const Dictionary& options)
     49     : ActiveDOMObject(context)
     50     , m_state(Pending)
     51     , m_options(adoptPtr(new MIDIOptions(options)))
     52 {
     53     ScriptWrappable::init(this);
     54 }
     55 
     56 MIDIAccessPromise::~MIDIAccessPromise()
     57 {
     58     stop();
     59 }
     60 
     61 bool MIDIAccessPromise::hasPendingActivity() const
     62 {
     63     return !!m_access && m_state != Accepted && m_state != Rejected;
     64 }
     65 
     66 void MIDIAccessPromise::stop()
     67 {
     68     m_state = Invoked;
     69     if (!!m_access)
     70         m_access->stop();
     71     clear();
     72 }
     73 
     74 void MIDIAccessPromise::fulfill()
     75 {
     76     if (m_state == Pending) {
     77         if (m_successCallback) {
     78             m_state = Invoked;
     79             ASSERT(m_access);
     80             m_successCallback->handleEvent(m_access.get(), m_options->sysex);
     81             clear();
     82         } else {
     83             m_state = Accepted;
     84         }
     85     }
     86 }
     87 
     88 void MIDIAccessPromise::reject(PassRefPtr<DOMError> error)
     89 {
     90     if (m_state == Pending) {
     91         if (m_errorCallback) {
     92             m_state = Invoked;
     93             m_errorCallback->handleEvent(error.get());
     94             clear();
     95         } else {
     96             m_state = Rejected;
     97             m_error = error;
     98         }
     99     }
    100 }
    101 
    102 void MIDIAccessPromise::then(PassOwnPtr<MIDISuccessCallback> successCallback, PassOwnPtr<MIDIErrorCallback> errorCallback)
    103 {
    104     // Lazily request access.
    105     if (!m_access)
    106         m_access = MIDIAccess::create(executionContext(), this);
    107 
    108     switch (m_state) {
    109     case Accepted:
    110         m_state = Invoked;
    111         successCallback->handleEvent(m_access.get(), m_options->sysex);
    112         clear();
    113         break;
    114     case Rejected:
    115         m_state = Invoked;
    116         errorCallback->handleEvent(m_error.get());
    117         clear();
    118         break;
    119     case Pending:
    120         m_successCallback = successCallback;
    121         m_errorCallback = errorCallback;
    122         break;
    123     case Invoked:
    124         break;
    125     default:
    126         ASSERT_NOT_REACHED();
    127     }
    128 }
    129 
    130 void MIDIAccessPromise::clear()
    131 {
    132     ASSERT(m_state == Invoked);
    133     m_access.clear();
    134     m_error.clear();
    135     m_options.clear();
    136     m_successCallback.clear();
    137     m_errorCallback.clear();
    138 }
    139 
    140 } // namespace WebCore
    141