001/** 002 * 003 * Licensed to the Apache Software Foundation (ASF) under one or more 004 * contributor license agreements. See the NOTICE file distributed with 005 * this work for additional information regarding copyright ownership. 006 * The ASF licenses this file to You under the Apache License, Version 2.0 007 * (the "License"); you may not use this file except in compliance with 008 * the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018package org.apache.kahadb.util; 019 020import java.util.ArrayList; 021 022/** 023 * Support utility that can be used to set the properties on any object 024 * using command line arguments. 025 * 026 * @author <a href="http://hiramchirino.com">Hiram Chirino</a> 027 */ 028public class CommandLineSupport { 029 030 /** 031 * Sets the properties of an object given the command line args. 032 * 033 * if args contains: --ack-mode=AUTO --url=tcp://localhost:61616 --persistent 034 * 035 * then it will try to call the following setters on the target object. 036 * 037 * target.setAckMode("AUTO"); 038 * target.setURL(new URI("tcp://localhost:61616") ); 039 * target.setPersistent(true); 040 * 041 * Notice the the proper conversion for the argument is determined by examining the 042 * setter argument type. 043 * 044 * @param target the object that will have it's properties set 045 * @param args the command line options 046 * @return any arguments that are not valid options for the target 047 */ 048 static public String[] setOptions(Object target, String []args) { 049 ArrayList rc = new ArrayList(); 050 051 for (int i = 0; i < args.length; i++) { 052 if( args[i] == null ) 053 continue; 054 055 if( args[i].startsWith("--") ) { 056 057 // --options without a specified value are considered boolean flags that are enabled. 058 String value="true"; 059 String name = args[i].substring(2); 060 061 // if --option=value case 062 int p = name.indexOf("="); 063 if( p > 0 ) { 064 value = name.substring(p+1); 065 name = name.substring(0,p); 066 } 067 068 // name not set, then it's an unrecognized option 069 if( name.length()==0 ) { 070 rc.add(args[i]); 071 continue; 072 } 073 074 String propName = convertOptionToPropertyName(name); 075 if( !IntrospectionSupport.setProperty(target, propName, value) ) { 076 rc.add(args[i]); 077 continue; 078 } 079 } else { 080 rc.add(args[i]); 081 } 082 083 } 084 085 String r[] = new String[rc.size()]; 086 rc.toArray(r); 087 return r; 088 } 089 090 /** 091 * converts strings like: test-enabled to testEnabled 092 * @param name 093 * @return 094 */ 095 private static String convertOptionToPropertyName(String name) { 096 String rc=""; 097 098 // Look for '-' and strip and then convert the subsequent char to uppercase 099 int p = name.indexOf("-"); 100 while( p > 0 ) { 101 // strip 102 rc += name.substring(0, p); 103 name = name.substring(p+1); 104 105 // can I convert the next char to upper? 106 if( name.length() >0 ) { 107 rc += name.substring(0,1).toUpperCase(); 108 name = name.substring(1); 109 } 110 111 p = name.indexOf("-"); 112 } 113 return rc+name; 114 } 115}