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/*
 * 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.
 */

 #ifndef _LOG4CXX_HELPERS_SYSTEM_H
 #define _LOG4CXX_HELPERS_SYSTEM_H

#include <log4cxx/logstring.h>
#include <log4cxx/helpers/exception.h>

 namespace log4cxx
 {
        namespace helpers
        {
                class Properties;

                /** The System class contains several useful class fields and methods.
                It cannot be instantiated.
                */
                class LOG4CXX_EXPORT System
                {
                public:

                /**
                Gets the system property indicated by the specified key.

                @param key the name of the system property.

                @return the string value of the system property, or the default value if
                there is no property with that key.

                @throws IllegalArgumentException if key is empty.
                */
                static LogString getProperty(const LogString& key);

                };
        } // namespace helpers
 } //  namespace log4cxx

 #endif //_LOG4CXX_HELPERS_SYSTEM_H