/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 *   
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

/* $Rev$ $Date$ */

#ifndef tuscany_sca_util_library_h
#define tuscany_sca_util_library_h

#if defined(WIN32)  || defined (_WINDOWS)
#include <windows.h> 
#else
#include <unistd.h>
#include <dlfcn.h>
#endif

#include <string>

#include "tuscany/sca/export.h"


namespace tuscany
{
    namespace sca
    {
        namespace util
        {
            /**
             * Information about shared libraries and methods to 
             * access these shared libraries.
             */
            class SCA_API Library
            {
            public:
                Library();
    
                /** 
                 * Constructor. Will load the library.
                 * @param libraryName Fully qualified name of the library.
                 */
                Library(const std::string& libraryName);
    
                /**
                 * Destructor. Will unload the library.
                 */ 
                virtual ~Library();
    
                Library(const Library& lib);
                Library& operator=(const Library& lib);
                
                /**
                 * Find an externalized symbol in the library.
                 * @param symbol The name of the symbol to be found.
                 * @return The pointer to the symbol if found, otherwise 0.
                 */ 
                void* getSymbol(const std::string& symbol);
            private:
                /**
                 * Name of the library.
                 */ 
                std::string name;
    
                /**
                 * Handle to the loaded library.
                 */ 
#if defined(WIN32)  || defined (_WINDOWS)
                HINSTANCE hDLL;
#else
                void* hDLL;
#endif
    
                /**
                 * Load the library.
                 */
                void load();
    
                /**
                 * Unload the library, if successfully loaded.
                 */ 
                void unload();
                            
            };
                
        } // End namespace util
    } // End namespace sca
} // End namespace tuscany

#endif // tuscany_sca_util_library_h