content: /**
   *
   * 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.store.kahadb.disk.util;
  
  import org.apache.activemq.util.IntrospectionSupport;
  
  import java.util.ArrayList;
  
  /**
   * Support utility that can be used to set the properties on any object
   * using command line arguments.
   * 
   * @author <a href="http://hiramchirino.com">Hiram Chirino</a>
   */
  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<String> 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;
  	}
  }
  