001    /**
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    package org.apache.geronimo.system.configuration.condition;
018    
019    import java.util.Map;
020    import java.util.Properties;
021    
022    import org.apache.commons.jexl.context.HashMapContext;
023    import org.apache.commons.logging.Log;
024    import org.apache.commons.logging.LogFactory;
025    
026    /**
027     * Basic parser utility functions.
028     *
029     * @version $Rev: 706640 $ $Date: 2008-10-21 14:44:05 +0000 (Tue, 21 Oct 2008) $
030     */
031    public class ParserUtils {
032    
033        public static void addDefaultVariables(Map vars) {
034            vars.put("java", new JavaVariable());    
035            vars.put("os", new OsVariable());
036        
037            // Install properties (to allow getProperty(x,y) to be used for defaults
038            Properties props = new Properties();
039            props.putAll(System.getProperties());
040            vars.put("props", props);
041        }
042           
043        public static class DebugHashMapContext extends HashMapContext {
044            private static final Log LOG = LogFactory.getLog(DebugHashMapContext.class);
045            public Object get(Object o) {
046                Object r = super.get(o);
047                LOG.debug("Get property: " + o + " " + r);
048                return r;
049            }
050        }
051    }