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// Copyright (c) 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 TOOLS_GN_ITEM_H_
#define TOOLS_GN_ITEM_H_
#include <string>
#include "tools/gn/label.h"
class Config;
class ItemNode;
class Target;
class Toolchain;
// A named item (target, config, etc.) that participates in the dependency
// graph.
class Item {
public:
Item(const Label& label);
virtual ~Item();
// This is guaranteed to never change after construction so this can be
// accessed from any thread with no locking once the item is constructed.
const Label& label() const { return label_; }
// The Item and the ItemNode make a pair. This will be set when the ItemNode
// is constructed that owns this Item. The ItemNode should only be
// dereferenced with the ItemTree lock held.
ItemNode* item_node() { return item_node_; }
const ItemNode* item_node() const { return item_node_; }
void set_item_node(ItemNode* in) { item_node_ = in; }
// Manual RTTI.
virtual Config* AsConfig();
virtual const Config* AsConfig() const;
virtual Target* AsTarget();
virtual const Target* AsTarget() const;
virtual Toolchain* AsToolchain();
virtual const Toolchain* AsToolchain() const;
// Returns a name like "target" or "config" for the type of item this is, to
// be used in logging and error messages.
std::string GetItemTypeName() const;
// Called when this item is resolved, meaning it and all of its dependents
// have no unresolved deps.
virtual void OnResolved() {}
private:
Label label_;
ItemNode* item_node_;
};
#endif // TOOLS_GN_ITEM_H_
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