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.logging.log4j.util;
018    
019    import java.io.InputStream;
020    import java.util.Properties;
021    
022    /**
023     * Utility class to help with accessing System Properties.
024     */
025    public class PropsUtil {
026    
027        private Properties props;
028    
029        public PropsUtil(Properties props) {
030            this.props = props;
031        }
032    
033        public PropsUtil(String propsLocn) {
034            this.props = new Properties();
035            ClassLoader loader = findClassLoader();
036            InputStream in = loader.getResourceAsStream(propsLocn);
037            if (null != in) {
038                try {
039                    this.props.load(in);
040                    in.close();
041                } catch(java.io.IOException e) {
042                    // ignored
043                }
044            }
045        }
046    
047        public String getStringProperty(String name) {
048            String prop = null;
049            try {
050                prop = System.getProperty(name);
051            } catch (SecurityException e) {
052                // Ignore
053            }
054            return (prop == null) ? props.getProperty(name) : prop;
055        }
056    
057        public String getStringProperty(String name, String defaultValue) {
058            String prop = getStringProperty(name);
059            return (prop == null) ? defaultValue : prop;
060        }
061    
062        public boolean getBooleanProperty(String name, boolean defaultValue) {
063            String prop = getStringProperty(name);
064            return (prop == null) ? defaultValue : "true".equalsIgnoreCase(prop);
065        }
066    
067        private static ClassLoader findClassLoader() {
068            ClassLoader cl;
069            if (System.getSecurityManager() == null) {
070                cl = Thread.currentThread().getContextClassLoader();
071            } else {
072                cl = java.security.AccessController.doPrivileged(
073                    new java.security.PrivilegedAction<ClassLoader>() {
074                        public ClassLoader run() {
075                            return Thread.currentThread().getContextClassLoader();
076                        }
077                    }
078                );
079            }
080            if (cl == null) {
081                cl = PropsUtil.class.getClassLoader();
082            }
083    
084            return cl;
085        }
086    }