001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.impl;
016    
017    import org.apache.hivemind.SymbolSource;
018    
019    /**
020     * Implementation of {@link org.apache.hivemind.SymbolSource} that
021     * accesses {@link java.lang.System#getProperty(java.lang.String)}.
022     *
023     * @author Howard Lewis Ship
024     */
025    public class SystemPropertiesSymbolSource implements SymbolSource
026    {
027    
028            /**
029             * Returns the value for the named system property, or null
030             * if no such system property exists.
031             */
032        public String valueForSymbol(String name)
033        {
034            return System.getProperty(name);
035        }
036    
037    }