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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef PPAPI_CPP_VAR_DICTIONARY_H_
#define PPAPI_CPP_VAR_DICTIONARY_H_
#include "ppapi/c/pp_bool.h"
#include "ppapi/cpp/var.h"
#include "ppapi/cpp/var_array.h"
/// @file
/// This file defines the API for interacting with dictionary vars.
namespace pp {
class VarDictionary : public Var {
public:
/// Constructs a new dictionary var.
VarDictionary();
/// Constructs a <code>VarDictionary</code> given a var for which
/// is_dictionary() is true. This will refer to the same dictionary var, but
/// allow you to access methods specific to dictionary.
///
/// @param[in] var A dictionary var.
explicit VarDictionary(const Var& var);
/// Constructs a <code>VarDictionary</code> given a <code>PP_Var</code>
/// of type PP_VARTYPE_DICTIONARY.
///
/// @param[in] var A <code>PP_Var</code> of type PP_VARTYPE_DICTIONARY.
explicit VarDictionary(const PP_Var& var);
/// Copy constructor.
VarDictionary(const VarDictionary& other);
virtual ~VarDictionary();
/// Assignment operator.
VarDictionary& operator=(const VarDictionary& other);
/// The <code>Var</code> assignment operator is overridden here so that we can
/// check for assigning a non-dictionary var to a
/// <code>VarDictionary</code>.
///
/// @param[in] other The dictionary var to be assigned.
///
/// @return The resulting <code>VarDictionary</code> (as a
/// <code>Var</code>&).
virtual Var& operator=(const Var& other);
/// Gets the value associated with the specified key.
///
/// @param[in] key A string var.
///
/// @return The value that is associated with <code>key</code>. If
/// <code>key</code> is not a string var, or it doesn't exist in the
/// dictionary, an undefined var is returned.
Var Get(const Var& key) const;
/// Sets the value associated with the specified key.
///
/// @param[in] key A string var. If this key hasn't existed in the dictionary,
/// it is added and associated with <code>value</code>; otherwise, the
/// previous value is replaced with <code>value</code>.
/// @param[in] value The value to set.
///
/// @return A <code>bool</code> indicating whether the operation succeeds.
bool Set(const Var& key, const Var& value);
/// Deletes the specified key and its associated value, if the key exists.
///
/// @param[in] key A string var.
void Delete(const Var& key);
/// Checks whether a key exists.
///
/// @param[in] key A string var.
///
/// @return A <code>bool</code> indicating whether the key exists.
bool HasKey(const Var& key) const;
/// Gets all the keys in the dictionary.
///
/// @return An array var which contains all the keys of the dictionary.
/// The elements are string vars. Returns an empty array var if failed.
VarArray GetKeys() const;
};
} // namespace pp
#endif // PPAPI_CPP_VAR_DICTIONARY_H_
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