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// Copyright (c) 2011 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 PPAPI_CPP_DIRECTORY_ENTRY_H_
#define PPAPI_CPP_DIRECTORY_ENTRY_H_
#include <vector>
#include "ppapi/c/pp_array_output.h"
#include "ppapi/c/pp_directory_entry.h"
#include "ppapi/cpp/array_output.h"
#include "ppapi/cpp/file_ref.h"
#include "ppapi/cpp/output_traits.h"
#include "ppapi/cpp/pass_ref.h"
/// @file
/// This file defines the API used to handle a directory entry.
namespace pp {
/// The <code>DirectoryEntry</code> class represents information about
/// a directory entry.
class DirectoryEntry {
public:
/// Default constructor for creating an is_null() <code>DirectoryEntry</code>
/// object.
DirectoryEntry();
/// A constructor used when you have a <code>PP_DirectoryEntry</code> which
/// contains a <code>FileRef</code> that has already been reference counted
/// as a return value.
///
/// @param[in] data A <code>PP_DirectoryEntry</code> to be copied.
DirectoryEntry(PassRef, const PP_DirectoryEntry& data);
/// A copy constructor for <code>DirectoryEntry</code>. This constructor
/// increments a reference count of the <code>FileRef</code> held by this
/// DirectoryEntry.
///
/// @param[in] other A pointer to a <code>DirectoryEntry</code>.
DirectoryEntry(const DirectoryEntry& other);
/// A destructor that decrements a reference count of the <code>FileRef</code>
/// held by this <code>DirectoryEntry</code>.
~DirectoryEntry();
/// This function assigns one <code>DirectoryEntry</code> object to this
/// <code>DirectoryEntry</code> object. This function increases the reference
/// count of the <code>FileRef</code> of the other DirectoryEntry while
/// decrementing the reference count of the FileRef of this DirectoryEntry.
///
/// @param[in] other A pointer to a <code>DirectoryEntry</code>.
///
/// @return A new <code>DirectoryEntry</code> object.
DirectoryEntry& operator=(const DirectoryEntry& other);
/// This function determines if this <code>DirectoryEntry</code> is a null
/// value.
///
/// @return true if this <code>DirectoryEntry</code> is null, otherwise false.
bool is_null() const { return !data_.file_ref; }
/// This function returns the <code>FileRef</code> held by this
/// <code>DirectoryEntry</code>.
///
/// @return A <code>FileRef</code> of the file.
FileRef file_ref() const { return FileRef(data_.file_ref); }
/// This function returns the <code>PP_FileType</code> of the file referenced
/// by this <code>DirectoryEntry</code>.
///
/// @return A <code>PP_FileType</code> of the file.
PP_FileType file_type() const { return data_.file_type; }
private:
PP_DirectoryEntry data_;
};
namespace internal {
class DirectoryEntryArrayOutputAdapterWithStorage
: public ArrayOutputAdapter<PP_DirectoryEntry> {
public:
DirectoryEntryArrayOutputAdapterWithStorage();
virtual ~DirectoryEntryArrayOutputAdapterWithStorage();
// Returns the final array of resource objects, converting the
// PP_DirectoryEntry written by the browser to pp::DirectoryEntry
// objects.
//
// This function should only be called once or we would end up converting
// the array more than once, which would mess up the refcounting.
std::vector<DirectoryEntry>& output();
private:
// The browser will write the PP_DirectoryEntrys into this array.
std::vector<PP_DirectoryEntry> temp_storage_;
// When asked for the output, the PP_DirectoryEntrys above will be
// converted to the pp::DirectoryEntrys in this array for passing to the
// calling code.
std::vector<DirectoryEntry> output_storage_;
};
// A specialization of CallbackOutputTraits to provide the callback system the
// information on how to handle vectors of pp::DirectoryEntry. This converts
// PP_DirectoryEntry to pp::DirectoryEntry when passing to the plugin.
template <>
struct CallbackOutputTraits< std::vector<DirectoryEntry> > {
typedef PP_ArrayOutput APIArgType;
typedef DirectoryEntryArrayOutputAdapterWithStorage StorageType;
static inline APIArgType StorageToAPIArg(StorageType& t) {
return t.pp_array_output();
}
static inline std::vector<DirectoryEntry>& StorageToPluginArg(
StorageType& t) {
return t.output();
}
static inline void Initialize(StorageType* /* t */) {}
};
} // namespace internal
} // namespace pp
#endif // PPAPI_CPP_DIRECTORY_ENTRY_H_
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