source: trunk/src/object.cc @ 77

// Copyright (C) 2012-2013 ChaosForge / Kornel Kisielewicz
// http://chaosforge.org/
//
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

#include "nv/object.hh"

#include "nv/root.hh"
#include "nv/types.hh"
#include "nv/lua/lua_state.hh"
#include "nv/uid.hh"

using namespace nv;

object::object()
        : m_root( nullptr ), m_id(), m_name(), m_uid(0), m_lua_index(-2), m_parent( nullptr ), m_children(), m_child_count(0)
{
//      m_uid = uid_store::get_free_uid();
//      uid_store::register_object( this, m_uid );
}

object::object( root* aroot, const string& aid )
        : m_root( aroot ), m_id(aid), m_name(), m_uid( 0 ), m_lua_index(-2), m_parent( nullptr ), m_children(), m_child_count(0)
{
        if ( m_root )
        {
                uid_store*  store = get_root()->get_uid_store();
                lua::state* state = get_root()->get_lua_state();
                if (store)
                {
                        m_uid = store->insert( this );
                }
                if (state)
                {
                        m_lua_index = state->register_object( this );
                }
        }

}

void object::add_child( object* child )
{
        if (child)
        {
                if (child->m_parent)
                {
                        child->detach();
                }
                child->m_parent = this;
                m_children.push_back( child );
                m_child_count++;
        }
}

void object::remove_child( object* child )
{
        if ( child->m_parent != this )
        {
                return; // signal error?
        }
        list::iterator it = std::find( m_children.begin(), m_children.end(), child );
        if ( it != m_children.end() )
        {
                (*it)->m_parent = nullptr;
                m_children.erase(it);
        }       
}

void object::detach()
{
        if (m_parent)
        {
                m_parent->remove_child( this );
        }
}

void object::change_parent( object* new_parent )
{
        if (m_parent) detach();
        if (new_parent) new_parent->add_child( this );
}

void object::destroy_children()
{
        while ( !m_children.empty() )
        {
                delete m_children.front();
        }
}

object::~object()
{
        if ( m_lua_index != lua::ref_none )
        {
                lua::state* state = get_root()->get_lua_state();
                state->unregister_object( this );
        }
        if ( m_uid != 0 && m_root )
        {
                uid_store* store = get_root()->get_uid_store();
                if (store) store->remove( m_uid );
        }
        detach();
        destroy_children();
}

object* object::find( object* child, bool recursive /*= false */ )
{
        list::iterator it = std::find( m_children.begin(), m_children.end(), child );
        if ( it != m_children.end() )
        {
                return *it;
        }
        if ( recursive )
        {
                for ( object* i : m_children )
                {
                        object* r = i->find( child, recursive );
                        if (r) return r;
                }
        }
        return nullptr;
}

object* object::find( uid child, bool recursive /*= false */ )
{
        for ( object* i : m_children )
        {
                if (i->m_uid == child) return i;
        }
        if ( recursive )
        {
                for ( object* i : m_children )
                {
                        object* r = i->find( child, recursive );
                        if (r) return r;
                }
        }
        return nullptr;
}

object* object::find( string child, bool recursive /*= false */ )
{
        for ( object* i : m_children )
        {
                if (i->m_id == child) return i;
        }
        if ( recursive )
        {
                for ( object* i : m_children )
                {
                        object* r = i->find( child, recursive );
                        if (r) return r;
                }
        }
        return nullptr;
}

bool object::move_to_top( object* child )
{
        list::iterator it = std::find( m_children.begin(), m_children.end(), child );
        if ( it != m_children.end() )
        {
                m_children.erase( it );
                m_children.push_back( child );
                return true;
        }       
        return false;
}

bool object::move_to_bottom( object* child )
{
        list::iterator it = std::find( m_children.begin(), m_children.end(), child );
        if ( it != m_children.end() )
        {
                m_children.erase( it );
                m_children.push_front( child );
                return true;
        }       
        return false;
}

void object::register_type( type_database* db )
{
        type_field fields[] = {
                type_field("id",          &object::m_id),
                type_field("uid",         &object::m_uid).flag( TF_READONLY ), 
                type_field("lua_index",   &object::m_lua_index).flag( TF_READONLY | TF_NOSERIALIZE ),
                type_field("parent",      &object::m_parent).flag( TF_READONLY | TF_NOSERIALIZE ),
                type_field("child_count", &object::m_child_count).flag( TF_READONLY ),
                type_field("children"   , &object::m_children).flag( TF_READONLY ),
        };
        db->create_type<object>().fields(fields);
}