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Resource.cc

// Resource.cc
// Copyright (c) 2002 Henrik Kinnunen (fluxgen@linuxmail.org)
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

// $Id: Resource.cc,v 1.4 2002/12/01 13:41:58 rathnor Exp $

#include "Resource.hh"
#include "XrmDatabaseHelper.hh"

#include <iostream>
#include <cassert>

using namespace std;

bool ResourceManager::m_init = false;

//-------- load -----------
// loads a resourcefile 
// returns true on success
// else false
//-------------------------
bool ResourceManager::load(const char *filename) {
    assert(filename);

    ensureXrmIsInitialize();
      
    XrmDatabaseHelper database;
    database = XrmGetFileDatabase(filename);
    if (database==0)
        return false;
      
    XrmValue value;
    char *value_type;
      
    //get list and go throu all the resources and load them
    ResourceList::iterator i = m_resourcelist.begin();
    ResourceList::iterator i_end = m_resourcelist.end();    
    for (; i != i_end; ++i) {
      
        Resource_base *resource = *i;
        if (XrmGetResource(*database, resource->name().c_str(),
                           resource->altName().c_str(), &value_type, &value))             
            resource->setFromString(value.addr);
        else {
            cerr<<"Failed to read: "<<resource->name()<<endl;
            cerr<<"Setting default value"<<endl;
            resource->setDefaultValue();
        }
    }

    return true;
}

//-------------- save -----------------
// Saves all the resource to a file
// returns 0 on success
// else negative value representing
// the error
//-------------------------------------
bool ResourceManager::save(const char *filename, const char *mergefilename) {
    assert(filename);
      
    ensureXrmIsInitialize();

    XrmDatabaseHelper database;

    string rc_string;   
    ResourceList::iterator i = m_resourcelist.begin();
    ResourceList::iterator i_end = m_resourcelist.end();
    //write all resources to database
    for (; i != i_end; ++i) {
        Resource_base *resource = *i;
        rc_string = resource->name() + string(": ") + resource->getString();
        XrmPutLineResource(&*database, rc_string.c_str());
    }

    if (database==0)
        return false;
      
    //check if we want to merge a database
    if (mergefilename) {
        XrmDatabaseHelper olddatabase(mergefilename);
        if (olddatabase == 0) // did we load the file?
            return false;
            
        XrmMergeDatabases(*database, &*olddatabase); // merge databases
        XrmPutFileDatabase(*olddatabase, filename); // save database to file
            
        *database = 0; // don't try to destroy the database
    } else // save database to file
        XrmPutFileDatabase(*database, filename);

    return true;
}

void ResourceManager::ensureXrmIsInitialize() {
    if (!m_init) {
        XrmInitialize();
        m_init = true;
    }
}
      

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