// Copyright 2013 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_HOST_RESOLVER_H_
#define PPAPI_CPP_HOST_RESOLVER_H_
#include "ppapi/c/pp_stdint.h"
#include "ppapi/c/ppb_host_resolver.h"
#include "ppapi/cpp/net_address.h"
#include "ppapi/cpp/pass_ref.h"
#include "ppapi/cpp/resource.h"
#include "ppapi/cpp/var.h"
namespace pp {
class CompletionCallback;
class InstanceHandle;
/// The <code>HostResolver</code> class supports host name resolution.
///
/// Permissions: In order to run <code>Resolve()</code>, apps permission
/// <code>socket</code> with subrule <code>resolve-host</code> is required.
/// For more details about network communication permissions, please see:
/// http://developer.chrome.com/apps/app_network.html
class HostResolver : public Resource {
public:
/// Default constructor for creating an is_null() <code>HostResolver</code>
/// object.
HostResolver();
/// A constructor used to create a <code>HostResolver</code> object.
///
/// @param[in] instance The instance with which this resource will be
/// associated.
explicit HostResolver(const InstanceHandle& instance);
/// A constructor used when you have received a <code>PP_Resource</code> as a
/// return value that has had 1 ref added for you.
///
/// @param[in] resource A <code>PPB_HostResolver</code> resource.
HostResolver(PassRef, PP_Resource resource);
/// The copy constructor for <code>HostResolver</code>.
///
/// @param[in] other A reference to another <code>HostResolver</code>.
HostResolver(const HostResolver& other);
/// The destructor.
virtual ~HostResolver();
/// The assignment operator for <code>HostResolver</code>.
///
/// @param[in] other A reference to another <code>HostResolver</code>.
///
/// @return A reference to this <code>HostResolver</code> object.
HostResolver& operator=(const HostResolver& other);
/// Static function for determining whether the browser supports the
/// <code>PPB_HostResolver</code> interface.
///
/// @return true if the interface is available, false otherwise.
static bool IsAvailable();
/// Requests resolution of a host name. If the call completes successully, the
/// results can be retrieved by <code>GetCanonicalName()</code>,
/// <code>GetNetAddressCount()</code> and <code>GetNetAddress()</code>.
///
/// @param[in] host The host name (or IP address literal) to resolve.
/// @param[in] port The port number to be set in the resulting network
/// addresses.
/// @param[in] hint A <code>PP_HostResolver_Hint</code> structure
/// providing hints for host resolution.
/// @param[in] callback A <code>CompletionCallback</code> to be called upon
/// completion.
///
/// @return An int32_t containing an error code from <code>pp_errors.h</code>.
/// <code>PP_ERROR_NOACCESS</code> will be returned if the caller doesn't have
/// required permissions. <code>PP_ERROR_NAME_NOT_RESOLVED</code> will be
/// returned if the host name couldn't be resolved.
int32_t Resolve(const char* host,
uint16_t port,
const PP_HostResolver_Hint& hint,
const CompletionCallback& callback);
/// Gets the canonical name of the host.
///
/// @return A string <code>Var</code> on success, which is an empty string
/// if <code>PP_HOSTRESOLVER_FLAG_CANONNAME</code> is not set in the hint
/// flags when calling <code>Resolve()</code>; an undefined <code>Var</code>
/// if there is a pending <code>Resolve()</code> call or the previous
/// <code>Resolve()</code> call failed.
Var GetCanonicalName() const;
/// Gets the number of network addresses.
///
/// @return The number of available network addresses on success; 0 if there
/// is a pending <code>Resolve()</code> call or the previous
/// <code>Resolve()</code> call failed.
uint32_t GetNetAddressCount() const;
/// Gets a network address.
///
/// @param[in] index An index indicating which address to return.
///
/// @return A <code>NetAddress</code> object. The object will be null
/// (i.e., is_null() returns true) if there is a pending
/// <code>Resolve()</code> call or the previous <code>Resolve()</code> call
/// failed, or the specified index is out of range.
NetAddress GetNetAddress(uint32_t index) const;
};
} // namespace pp
#endif // PPAPI_CPP_HOST_RESOLVER_H_