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.activemq.store.kahadb.disk.util; 019 020import org.apache.activemq.util.IntrospectionSupport; 021 022import java.util.ArrayList; 023 024/** 025 * Support utility that can be used to set the properties on any object 026 * using command line arguments. 027 * 028 * @author <a href="http://hiramchirino.com">Hiram Chirino</a> 029 */ 030public class CommandLineSupport { 031 032 /** 033 * Sets the properties of an object given the command line args. 034 * 035 * if args contains: --ack-mode=AUTO --url=tcp://localhost:61616 --persistent 036 * 037 * then it will try to call the following setters on the target object. 038 * 039 * target.setAckMode("AUTO"); 040 * target.setURL(new URI("tcp://localhost:61616") ); 041 * target.setPersistent(true); 042 * 043 * Notice the the proper conversion for the argument is determined by examining the 044 * setter argument type. 045 * 046 * @param target the object that will have it's properties set 047 * @param args the command line options 048 * @return any arguments that are not valid options for the target 049 */ 050 static public String[] setOptions(Object target, String []args) { 051 ArrayList rc = new ArrayList(); 052 053 for (int i = 0; i < args.length; i++) { 054 if( args[i] == null ) 055 continue; 056 057 if( args[i].startsWith("--") ) { 058 059 // --options without a specified value are considered boolean flags that are enabled. 060 String value="true"; 061 String name = args[i].substring(2); 062 063 // if --option=value case 064 int p = name.indexOf("="); 065 if( p > 0 ) { 066 value = name.substring(p+1); 067 name = name.substring(0,p); 068 } 069 070 // name not set, then it's an unrecognized option 071 if( name.length()==0 ) { 072 rc.add(args[i]); 073 continue; 074 } 075 076 String propName = convertOptionToPropertyName(name); 077 if( !IntrospectionSupport.setProperty(target, propName, value) ) { 078 rc.add(args[i]); 079 continue; 080 } 081 } else { 082 rc.add(args[i]); 083 } 084 085 } 086 087 String r[] = new String[rc.size()]; 088 rc.toArray(r); 089 return r; 090 } 091 092 /** 093 * converts strings like: test-enabled to testEnabled 094 * @param name 095 * @return 096 */ 097 private static String convertOptionToPropertyName(String name) { 098 String rc=""; 099 100 // Look for '-' and strip and then convert the subsequent char to uppercase 101 int p = name.indexOf("-"); 102 while( p > 0 ) { 103 // strip 104 rc += name.substring(0, p); 105 name = name.substring(p+1); 106 107 // can I convert the next char to upper? 108 if( name.length() >0 ) { 109 rc += name.substring(0,1).toUpperCase(); 110 name = name.substring(1); 111 } 112 113 p = name.indexOf("-"); 114 } 115 return rc+name; 116 } 117}