src/cobalt/dom/source_buffer_list.cc

/*
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// Modifications Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "cobalt/dom/source_buffer_list.h"

#include <algorithm>
#include <limits>

#include "base/logging.h"
#include "base/strings/stringprintf.h"
#include "cobalt/base/tokens.h"
#include "cobalt/dom/event.h"

namespace cobalt {
namespace dom {

namespace {
// SourceBufferList usually contains 2 source buffers.
const int kSizeOfSourceBufferToReserveInitially = 2;
}  // namespace

SourceBufferList::SourceBufferList(script::EnvironmentSettings* settings,
                                   EventQueue* event_queue)
    : EventTarget(settings), event_queue_(event_queue) {
  DCHECK(event_queue_);
  source_buffers_.reserve(kSizeOfSourceBufferToReserveInitially);
}

SourceBufferList::~SourceBufferList() { DCHECK(source_buffers_.empty()); }

uint32 SourceBufferList::length() const {
  DCHECK_LE(source_buffers_.size(), std::numeric_limits<uint32>::max());
  return static_cast<uint32>(source_buffers_.size());
}

scoped_refptr<SourceBuffer> SourceBufferList::Item(uint32 index) const {
  if (index < source_buffers_.size()) {
    return source_buffers_[index];
  }
  return NULL;
}

void SourceBufferList::Add(const scoped_refptr<SourceBuffer>& source_buffer) {
  source_buffers_.push_back(source_buffer);
  ScheduleEvent(base::Tokens::addsourcebuffer());
}

void SourceBufferList::Insert(
    size_t position, const scoped_refptr<SourceBuffer>& source_buffer) {
  source_buffers_.insert(source_buffers_.begin() + position, source_buffer);
  ScheduleEvent(base::Tokens::addsourcebuffer());
}

void SourceBufferList::Remove(
    const scoped_refptr<SourceBuffer>& source_buffer) {
  SourceBuffers::iterator iter =
      std::find(source_buffers_.begin(), source_buffers_.end(), source_buffer);
  if (iter == source_buffers_.end()) {
    return;
  }

  source_buffers_.erase(iter);
  ScheduleEvent(base::Tokens::removesourcebuffer());
}

size_t SourceBufferList::Find(
    const scoped_refptr<SourceBuffer>& source_buffer) const {
  DCHECK(Contains(source_buffer));
  return std::distance(
      source_buffers_.begin(),
      std::find(source_buffers_.begin(), source_buffers_.end(), source_buffer));
}

bool SourceBufferList::Contains(
    const scoped_refptr<SourceBuffer>& source_buffer) const {
  return std::find(source_buffers_.begin(), source_buffers_.end(),
                   source_buffer) != source_buffers_.end();
}

void SourceBufferList::Clear() {
  source_buffers_.clear();
  ScheduleEvent(base::Tokens::removesourcebuffer());
}

void SourceBufferList::TraceMembers(script::Tracer* tracer) {
  EventTarget::TraceMembers(tracer);

  if (event_queue_) {
    event_queue_->TraceMembers(tracer);
  }
  for (const auto& source_buffer : source_buffers_) {
    tracer->Trace(source_buffer);
  }
}

void SourceBufferList::ScheduleEvent(base::Token event_name) {
  scoped_refptr<Event> event = new Event(event_name);
  event->set_target(this);
  event_queue_->Enqueue(event);
}

}  // namespace dom
}  // namespace cobalt