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 */
018 package org.fusesource.hawtbuf.proto.compiler;
019
020 import 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 */
028 public 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 }