org.apache.activemq.protobuf.compiler.CommandLineSupport Maven / Gradle / Ivy
/**
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.protobuf.compiler;
import java.util.ArrayList;
/**
* Support utility that can be used to set the properties on any object
* using command line arguments.
*
* @author Hiram Chirino
*/
public class CommandLineSupport {
/**
* Sets the properties of an object given the command line args.
*
* if args contains: --ack-mode=AUTO --url=tcp://localhost:61616 --persistent
*
* then it will try to call the following setters on the target object.
*
* target.setAckMode("AUTO");
* target.setURL(new URI("tcp://localhost:61616") );
* target.setPersistent(true);
*
* Notice the the proper conversion for the argument is determined by examining the
* setter argument type.
*
* @param target the object that will have it's properties set
* @param args the command line options
* @return any arguments that are not valid options for the target
*/
static public String[] setOptions(Object target, String []args) {
ArrayList rc = new ArrayList();
for (int i = 0; i < args.length; i++) {
if( args[i] == null )
continue;
if( args[i].startsWith("--") ) {
// --options without a specified value are considered boolean flags that are enabled.
String value="true";
String name = args[i].substring(2);
// if --option=value case
int p = name.indexOf("=");
if( p > 0 ) {
value = name.substring(p+1);
name = name.substring(0,p);
}
// name not set, then it's an unrecognized option
if( name.length()==0 ) {
rc.add(args[i]);
continue;
}
String propName = convertOptionToPropertyName(name);
if( !IntrospectionSupport.setProperty(target, propName, value) ) {
rc.add(args[i]);
continue;
}
} else {
rc.add(args[i]);
}
}
String r[] = new String[rc.size()];
rc.toArray(r);
return r;
}
/**
* converts strings like: test-enabled to testEnabled
* @param name
* @return
*/
private static String convertOptionToPropertyName(String name) {
String rc="";
// Look for '-' and strip and then convert the subsequent char to uppercase
int p = name.indexOf("-");
while( p > 0 ) {
// strip
rc += name.substring(0, p);
name = name.substring(p+1);
// can I convert the next char to upper?
if( name.length() >0 ) {
rc += name.substring(0,1).toUpperCase();
name = name.substring(1);
}
p = name.indexOf("-");
}
return rc+name;
}
}