ICmpTemplateManager.h

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/* Copyright (C) 2010 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * 0 A.D. is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef INCLUDED_ICMPTEMPLATEMANAGER
#define INCLUDED_ICMPTEMPLATEMANAGER

#include "simulation2/system/Interface.h"

#include <vector>

/**
 * Template manager: Handles the loading of entity template files for the initialisation
 * and deserialization of entity components.
 *
 * Template names are intentionally restricted to ASCII strings for storage/serialization
 * efficiency (we have a lot of strings so this is significant);
 * they correspond to filenames so they shouldn't contain non-ASCII anyway.
 */
class ICmpTemplateManager : public IComponent
{
public:
    /**
     * Loads the template XML file identified by 'templateName' (including inheritance
     * from parent XML files), and applies the techs that are currently active for
     * player 'playerID', for use with a new entity 'ent'.
     * The returned CParamNode must not be used for any entities other than 'ent'.
     *
     * If templateName is of the form "actor|foo" then it will load a default
     * stationary entity template that uses actor "foo". (This is a convenience to
     * avoid the need for hundreds of tiny decorative-object entity templates.)
     *
     * If templateName is of the form "preview|foo" then it will load a template
     * based on entity template "foo" with the non-graphical components removed.
     * (This is for previewing construction/placement of units.)
     *
     * If templateName is of the form "corpse|foo" then it will load a template
     * like "preview|foo" but with corpse-related components included.
     *
     * If templateName is of the form "foundation|foo" then it will load a template
     * based on entity template "foo" with various components removed and a few changed
     * and added. (This is for constructing foundations of buildings.)
     *
     * @return NULL on error
     */
    virtual const CParamNode* LoadTemplate(entity_id_t ent, const std::string& templateName, int playerID) = 0;

    /**
     * Loads the template XML file identified by 'templateName' (including inheritance
     * from parent XML files). The templateName syntax is the same as LoadTemplate.
     *
     * @return NULL on error
     */
    virtual const CParamNode* GetTemplate(std::string templateName) = 0;

    /**
     * Like GetTemplate, except without doing the XML validation (so it's faster but
     * may return invalid templates).
     *
     * @return NULL on error
     */
    virtual const CParamNode* GetTemplateWithoutValidation(std::string templateName) = 0;

    /**
     * Returns the template most recently specified for the entity 'ent'.
     * Used during deserialization.
     *
     * @return NULL on error
     */
    virtual const CParamNode* LoadLatestTemplate(entity_id_t ent) = 0;

    /**
     * Returns the name of the template most recently specified for the entity 'ent'.
     */
    virtual std::string GetCurrentTemplateName(entity_id_t ent) = 0;

    /**
     * Returns the list of entities having the specified template.
     */
    virtual std::vector<entity_id_t> GetEntitiesUsingTemplate(std::string templateName) = 0;

    /**
     * Returns a list of strings that could be validly passed as @c templateName to LoadTemplate.
     * (This includes "actor|foo" etc names).
     * Intended for use by the map editor. This is likely to be quite slow.
     */
    virtual std::vector<std::string> FindAllTemplates(bool includeActors) = 0;

    /**
     * Permanently disable XML validation (intended solely for test cases).
     */
    virtual void DisableValidation() = 0;

    /*
     * TODO:
     * When an entity changes template (e.g. upgrades) or player ownership, it
     * should call some Reload(ent, templateName, playerID) function to load its new template.
     * When a player researches new techs, it should call Reload(playerID).
     * When a file changes on disk, something should call Reload(templateName).
     *
     * Reloading should happen by sending a message to affected components (containing
     * their new CParamNode), then automatically updating this.template of scripted components.
     */

    DECLARE_INTERFACE_TYPE(TemplateManager)
};

#endif // INCLUDED_ICMPTEMPLATEMANAGER