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A Lightweight Performance Testing Framework

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/*
 * -----------------------------------------------------------------------\
 * PerfCake
 *  
 * Copyright (C) 2010 - 2013 the original author or authors.
 *  
 * Licensed 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.
 * -----------------------------------------------------------------------/
 */
package org.perfcake.util.properties;

/**
 * @author Pavel Macík 
 * @author Martin Večeřa 
 */
public enum SystemPropertyGetter implements PropertyGetter {

   INSTANCE;

   private SystemPropertyGetter() {

   }

   /**
    * Returns a property value. First it looks at system properties using {@link System#getProperty(String)} if the system property does not exist
    * it looks at environment variables using {@link System#getenv(String)}. If
    * the variable does not exist the method returns defautValue.
    *
    * @param name
    *       Property name
    * @param defaultValue
    *       Default property value
    * @return Property value or defaultValue.
    */
   @Override
   public String getProperty(final String name, final String defaultValue) {
      if (System.getProperty(name) != null) {
         return System.getProperty(name);
      } else if (System.getenv(name) != null) {
         return System.getenv(name);
      } else {
         return defaultValue;
      }
   }

   @Override
   public String getProperty(final String propName) {
      return getProperty(propName, null);
   }

}