Coverage Report - org.apache.commons.configuration.interpol.EnvironmentLookup
 
Classes in this File Line Coverage Branch Coverage Complexity
EnvironmentLookup
100%
3/3
N/A
1
 
 1  
 /*
 2  
  * Licensed to the Apache Software Foundation (ASF) under one or more
 3  
  * contributor license agreements.  See the NOTICE file distributed with
 4  
  * this work for additional information regarding copyright ownership.
 5  
  * The ASF licenses this file to You under the Apache License, Version 2.0
 6  
  * (the "License"); you may not use this file except in compliance with
 7  
  * the License.  You may obtain a copy of the License at
 8  
  *
 9  
  *     http://www.apache.org/licenses/LICENSE-2.0
 10  
  *
 11  
  * Unless required by applicable law or agreed to in writing, software
 12  
  * distributed under the License is distributed on an "AS IS" BASIS,
 13  
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 14  
  * See the License for the specific language governing permissions and
 15  
  * limitations under the License.
 16  
  */
 17  
 package org.apache.commons.configuration.interpol;
 18  
 
 19  
 import org.apache.commons.configuration.EnvironmentConfiguration;
 20  
 import org.apache.commons.lang.text.StrLookup;
 21  
 
 22  
 /**
 23  
  * <p>
 24  
  * A specialized lookup implementation that allows access to environment
 25  
  * variables.
 26  
  * </p>
 27  
  * <p>
 28  
  * This implementation relies on {@link EnvironmentConfiguration} to resolve
 29  
  * environment variables. It can be used for referencing environment variables
 30  
  * in configuration files in an easy way, for instance:
 31  
  *
 32  
  * <pre>
 33  
  * java.home = ${env:JAVA_HOME}
 34  
  * </pre>
 35  
  *
 36  
  * </p>
 37  
  * <p>
 38  
  * {@code EnvironmentLookup} is one of the standard lookups that is
 39  
  * registered per default for each configuration.
 40  
  * </p>
 41  
  *
 42  
  * @author <a
 43  
  *         href="http://commons.apache.org/configuration/team-list.html">Commons
 44  
  *         Configuration team</a>
 45  
  * @since 1.7
 46  
  * @version $Id: EnvironmentLookup.java 1210620 2011-12-05 20:57:31Z oheger $
 47  
  */
 48  3
 public class EnvironmentLookup extends StrLookup
 49  
 {
 50  
     /** Stores the underlying {@code EnvironmentConfiguration}. */
 51  3
     private final EnvironmentConfiguration environmentConfig = new EnvironmentConfiguration();
 52  
 
 53  
     /**
 54  
      * Performs a lookup for the specified variable. This implementation
 55  
      * directly delegates to a {@code EnvironmentConfiguration}.
 56  
      *
 57  
      * @param key the key to lookup
 58  
      * @return the value of this key or <b>null</b> if it cannot be resolved
 59  
      */
 60  
     @Override
 61  
     public String lookup(String key)
 62  
     {
 63  119
         return environmentConfig.getString(key);
 64  
     }
 65  
 }