third_party/WebKit/Source/core/clipboard/DataTransferItem.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *     * Redistributions of source code must retain the above copyright
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 * in the documentation and/or other materials provided with the
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "core/clipboard/DataTransferItem.h"

#include "base/location.h"
#include "bindings/core/v8/V8BindingForCore.h"
#include "bindings/core/v8/v8_function_string_callback.h"
#include "core/clipboard/DataObjectItem.h"
#include "core/clipboard/DataTransfer.h"
#include "core/dom/ExecutionContext.h"
#include "core/probe/CoreProbes.h"
#include "platform/wtf/StdLibExtras.h"
#include "platform/wtf/text/WTFString.h"
#include "public/platform/TaskType.h"

namespace blink {

DataTransferItem* DataTransferItem::Create(DataTransfer* data_transfer,
                                           DataObjectItem* item) {
  return new DataTransferItem(data_transfer, item);
}

String DataTransferItem::kind() const {
  DEFINE_STATIC_LOCAL(const String, kind_string, ("string"));
  DEFINE_STATIC_LOCAL(const String, kind_file, ("file"));
  if (!data_transfer_->CanReadTypes())
    return String();
  switch (item_->Kind()) {
    case DataObjectItem::kStringKind:
      return kind_string;
    case DataObjectItem::kFileKind:
      return kind_file;
  }
  NOTREACHED();
  return String();
}

String DataTransferItem::type() const {
  if (!data_transfer_->CanReadTypes())
    return String();
  return item_->GetType();
}

void DataTransferItem::getAsString(ScriptState* script_state,
                                   V8FunctionStringCallback* callback) {
  if (!data_transfer_->CanReadData())
    return;
  if (!callback || item_->Kind() != DataObjectItem::kStringKind)
    return;

  callbacks_.emplace_back(callback);
  ExecutionContext* context = ExecutionContext::From(script_state);
  probe::AsyncTaskScheduled(context, "DataTransferItem.getAsString", callback);
  context->GetTaskRunner(TaskType::kUserInteraction)
      ->PostTask(FROM_HERE,
                 WTF::Bind(&DataTransferItem::RunGetAsStringTask,
                           WrapPersistent(this), WrapPersistent(context),
                           WrapPersistent(callback), item_->GetAsString()));
}

File* DataTransferItem::getAsFile() const {
  if (!data_transfer_->CanReadData())
    return nullptr;

  return item_->GetAsFile();
}

DataTransferItem::DataTransferItem(DataTransfer* data_transfer,
                                   DataObjectItem* item)
    : data_transfer_(data_transfer), item_(item) {}

void DataTransferItem::RunGetAsStringTask(ExecutionContext* context,
                                          V8FunctionStringCallback* callback,
                                          const String& data) {
  DCHECK(callback);
  probe::AsyncTask async_task(context, callback);
  if (context)
    callback->InvokeAndReportException(nullptr, data);
  size_t index = callbacks_.Find(callback);
  DCHECK(index != kNotFound);
  callbacks_.EraseAt(index);
}

void DataTransferItem::Trace(blink::Visitor* visitor) {
  visitor->Trace(data_transfer_);
  visitor->Trace(item_);
  visitor->Trace(callbacks_);
  ScriptWrappable::Trace(visitor);
}

void DataTransferItem::TraceWrappers(
    const ScriptWrappableVisitor* visitor) const {
  for (auto callback : callbacks_)
    visitor->TraceWrappers(callback);
  ScriptWrappable::TraceWrappers(visitor);
}

}  // namespace blink