source: osgVisual/trunk/src/extLink/dataIO_extLinkVCL.cpp @ 218

/* -*-c++-*- osgVisual - Copyright (C) 2009-2010 Torben Dannhauer
 *
 * This library is based on OpenSceneGraph, open source and may be redistributed and/or modified under 
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
 * You have to aquire licenses for all used proprietary modules.
 * 
 * This library 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
 * OpenSceneGraph Public License for more details.
*/

#include <dataIO_extLinkVCL.h>

#include <visual_dataIO.h>      // include in.cpp to avoid circular inclusion (visual_dataIO <-> extLinkVCL)

using namespace osgVisual;

dataIO_extLinkVCL::dataIO_extLinkVCL(std::vector<dataIO_slot *>& dataSlots_) : dataIO_extLink(dataSlots_)
{
        OSG_NOTIFY( osg::ALWAYS ) << "extLinkVCL constructed" << std::endl;
}

dataIO_extLinkVCL::~dataIO_extLinkVCL(void)
{
        OSG_NOTIFY( osg::ALWAYS ) << "extLinkVCL destroyed" << std::endl;
}

bool dataIO_extLinkVCL::init(xmlNode* configurationNode)
{
        if (!configurationNode || !processXMLConfiguration(configurationNode))
                return false;

        OSG_NOTIFY( osg::ALWAYS ) << "extLinkVCL init()" << std::endl;

        if ( osgDB::fileExists( VCLConfigFilename ) )
        {
                CVCLIO::GetInstance().LoadProject(VCLConfigFilename.c_str());

                parseVCLConfig();
                
                initialized = true;
        }
        else
        {
                OSG_NOTIFY( osg::FATAL ) << "ERROR: Could not find VCL Configuration file '" << VCLConfigFilename << "', falling back to extLinkDummy" << std::endl;
                return false;
        }
        return true;
}

bool dataIO_extLinkVCL::processXMLConfiguration(xmlNode* extLinkConfig_)
{
        // Extract VCL config file
        xmlAttr  *attr = extLinkConfig_->properties;
        while ( attr ) 
        { 
                std::string attr_name=reinterpret_cast<const char*>(attr->name);
                std::string attr_value=reinterpret_cast<const char*>(attr->children->content);
                if( attr_name == "implementation" )
                {
                        if(attr_value != "vcl")
                        {
                                OSG_NOTIFY( osg::ALWAYS ) << "WARNING: extLink configuration does not match the currently used 'vcl' implementation, falling back to extLinkDummy" << std::endl;
                                return false;
                        }
                }
                if( attr_name == "filename" )
                {
                        VCLConfigFilename = attr_value;
                }
                attr = attr->next; 
        }       // WHILE attrib END

        return true;
}

void dataIO_extLinkVCL::shutdown()
{
        OSG_NOTIFY( osg::ALWAYS ) << "extLinkVCL shutdown()" << std::endl;
}

bool dataIO_extLinkVCL::readTO_OBJvalues()
{
        OSG_NOTIFY( osg::INFO ) << "extLinkVCL readTO_OBJvalues()" << std::endl;

        // perform external data exchange
        CVCLIO::GetInstance().DoDataExchange();

        // read TO_OBJ values from VCL
        for(unsigned int i=0;i<extLinkChannels.size();i++)
        {
                if(extLinkSlots[i]->getdataDirection() == osgVisual::dataIO_slot::TO_OBJ)
                {
                        //Copy data from VCL to slot. IMPORTANT: Due to VCL's string incapability only double slots are filled.
                        osgVisual::visual_dataIO::getInstance()->setSlotData( extLinkSlots[i]->getVariableName(), osgVisual::dataIO_slot::TO_OBJ, extLinkChannels[i]->GetValue() );
                }       // IF (TO_OBJ) END
        }

        return true;
}

bool dataIO_extLinkVCL::writebackFROM_OBJvalues()
{
        OSG_NOTIFY( osg::INFO ) << "extLinkVCL writebackFROM_OBJvalues()" << std::endl;

        // write FROM_OBJ values into VCL
        for(unsigned int i=0;i<extLinkChannels.size();i++)
        {
                if(extLinkSlots[i]->getdataDirection() == osgVisual::dataIO_slot::FROM_OBJ && extLinkSlots[i]->getvarType() == osgVisual::dataIO_slot::DOUBLE)
                {
                        //Copy data from slot to VCL. IMPORTANT: Due to VCL's string incapability only double slots are filled.
                        extLinkChannels[i]->SetValue( osgVisual::visual_dataIO::getInstance()->getSlotDataAsDouble( extLinkSlots[i]->getVariableName(), osgVisual::dataIO_slot::FROM_OBJ ) );
                }       // IF (FROM_OBJ) END
        }

        /* In VCL no VCL dataexchange is performed, 
        it is postponed until the next frame beginning,
        where TO_OBJ exchange calls CVCLIO::GetInstance().DoDataExchange();.
        */
        return true;
}

bool dataIO_extLinkVCL::parseVCLConfig()
{
        configFileValid = false;
        xmlDoc *doc = NULL;
    xmlNode *root_element = NULL;
        
        doc = xmlReadFile(VCLConfigFilename.c_str(), NULL, 0);
        if (doc == NULL)
        {
                configFileValid = false;
                std::cout << "error: could not parse file" << VCLConfigFilename;
        }
        else
        {
                //  Get the root element node
                root_element = xmlDocGetRootElement(doc);

                // Parse the XML document.
                checkXMLNode(root_element);

                // free the document
                xmlFreeDoc(doc);;
        }
        // Free the global variables that may have been allocated by the parser.
        xmlCleanupParser();

        if(!configFileValid)
                OSG_ALWAYS << "ERROR: XML file seems not to be a valid VCL configuration file!" << std::endl;

        return true;
}

void dataIO_extLinkVCL::checkXMLNode(xmlNode * a_node)
{
    for (xmlNode *cur_node = a_node; cur_node; cur_node = cur_node->next)
        {
                std::string node_name=reinterpret_cast<const char*>(cur_node->name);
                if(cur_node->type == XML_ELEMENT_NODE && node_name == "CONFIGURATION")
                {
                        //OSG_DEBUG << "XML node CONFIGURATION found" << std::endl;
                        configFileValid = true;
                }

        if (cur_node->type == XML_ELEMENT_NODE && node_name == "CHANNEL")
                {
                        //OSG_DEBUG << "XML node CHANNEL found" << std::endl;

                        // Extract channel infos like name, direction and extract channels
                        std::string name;
                        dataIO_slot::dataDirection direction;
                        xmlAttr  *attr = cur_node->properties;
                        while ( attr ) 
                        { 
                                std::string attr_name=reinterpret_cast<const char*>(attr->name);
                                if( attr_name == "name" )
                                        name = reinterpret_cast<const char*>(attr->children->content);
                                if( attr_name == "multicast_in_group" )
                                        direction = dataIO_slot::TO_OBJ;
                                if( attr_name == "multicast_out_group" )
                                        direction = dataIO_slot::FROM_OBJ;
                                //std::cout << "Attribute name: " << attr->name << " value: " << attr->children->content << std::endl;
                                attr = attr->next; 
                        } 
                        addChannels(cur_node->children, name, direction );
        
            //OSG_DEBUG << "node type=Element, name:" << cur_node->name << std::endl;
                        //OSG_DEBUG << "Processing children at " << cur_node->children << std::endl;
        }       // IF(CHANNEL) END

                // Iterate to the next nodes to find channels.
        checkXMLNode(cur_node->children);               
    }   // FOR END
}

void dataIO_extLinkVCL::addChannels(xmlNode * a_node, std::string channelName_, dataIO_slot::dataDirection direction_ )
{
        if(!a_node)
                return;

        OSG_ALWAYS << "dataIO_extL) : Processing entries for channel " << channelName_ << " with the direction " << direction_ << std::endl;

        for (xmlNode *cur_node = a_node; cur_node; cur_node = cur_node->next)
        {
                if (cur_node->type != XML_ELEMENT_NODE) // only emelent nodes are relevant entries. otherwise skip this iteration. VCL files only contain text nodes in comments or as untrimmed element nodes.
                        continue;               

                // Extract ENTRY - name (from the Channel <ENTRY> in the XML file
                std::string entryName;
                xmlAttr  *attr = cur_node->properties;
                while ( attr ) 
                { 
                        std::string attr_name=reinterpret_cast<const char*>(attr->name);
                        if( attr_name == "name" )
                                entryName = reinterpret_cast<const char*>(attr->children->content);
                        //OSG_DEBUG << "Attribute name: " << attr->name << " value: " << attr->children->content << std::endl;
                        attr = attr->next; 
                } 

                // Store VCL variable
                CVCLVariable<double>* tmp = new CVCLVariable<double>;
                extLinkChannels.push_back(tmp);

                // Attach VCL variable to channel:
                //OSG_DEBUG << "attaching.... name: " << channelName_ << ", entryName: " << entryName << std::endl;
                if( !tmp->Attach(channelName_.c_str(), entryName.c_str() ) )
                        OSG_ALWAYS << "ERROR - dataIO_extLinkVCL::addChannels(): unable to attach VCL variable entryName: " << entryName << " to channel: " << channelName_ << std::endl;

                // Set SLOT data and store SLOT pointer 
                osgVisual::dataIO_slot* tmpSlot = osgVisual::visual_dataIO::getInstance()->setSlotData( entryName, direction_, 0 );
                extLinkSlots.push_back( tmpSlot );

        }       // FOR each ENTRY END
}