1 /** 2 * Copyright (C) 2010 the original author or authors. 3 * See the notice.md file distributed with this work for additional 4 * information regarding copyright ownership. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package com.beust.jcommander.defaultprovider; 20 21 import com.beust.jcommander.IDefaultProvider; 22 import com.beust.jcommander.ParameterException; 23 24 import java.io.IOException; 25 import java.net.URL; 26 import java.util.Properties; 27 28 /** 29 * A default provider that reads its default values from a property file. 30 * 31 * @author cbeust 32 */ 33 public class PropertyFileDefaultProvider implements IDefaultProvider { 34 public static final String DEFAULT_FILE_NAME = "jcommander.properties"; 35 private Properties m_properties; 36 37 public PropertyFileDefaultProvider() { 38 init(DEFAULT_FILE_NAME); 39 } 40 41 public PropertyFileDefaultProvider(String fileName) { 42 init(fileName); 43 } 44 45 private void init(String fileName) { 46 try { 47 m_properties = new Properties(); 48 URL url = ClassLoader.getSystemResource(fileName); 49 if (url != null) { 50 m_properties.load(url.openStream()); 51 } else { 52 throw new ParameterException("Could not find property file: " + fileName 53 + " on the class path"); 54 } 55 } 56 catch (IOException e) { 57 throw new ParameterException("Could not open property file: " + fileName); 58 } 59 } 60 61 public String getDefaultValueFor(String optionName) { 62 int index = 0; 63 while (index < optionName.length() && ! Character.isLetterOrDigit(optionName.charAt(index))) { 64 index++; 65 } 66 String key = optionName.substring(index); 67 return m_properties.getProperty(key); 68 } 69 70 } 71
