/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

#ifndef SYSINFO_H

#define SYSINFO_H

#include "tstrings.h"

//

// This namespace provides information about environment in which

// the current application runs.

// It is for general purpose use.

// Functions in this namespaces are just queries about the environment.

// Functions that change the existing environment like file or directory

// creation should not be added to this namespace.

//

namespace SysInfo {

    /**

     * Returns temp dir (for the current user).

     */

    tstring getTempDir();

    /**

     * Returns absolute path to the process executable.

     */

    tstring getProcessModulePath();

    /**

     * Returns absolute path to the current executable module.

     */ 

    tstring getCurrentModulePath();

    /**

     * Returns value of environment variable with the given name.

     * Throws exception if variable is not set or any other error occurred

     * reading the value.

     */

    tstring getEnvVariable(const tstring& name);

    /**

     * Returns value of environment variable with the given name.

     * Returns value of 'defValue' parameter if variable is not set or any

     * other error occurred reading the value.

     */

    tstring getEnvVariable(const std::nothrow_t&, const tstring& name,

                                            const tstring& defValue=tstring());

    /**

     * Returns 'true' if environment variable with the given name is set.

     */

    bool isEnvVariableSet(const tstring& name);

}

#endif // SYSINFO_H