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ActiveMQ example source code file (CommandLineSupport.java)

This example ActiveMQ source code file (CommandLineSupport.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

arraylist, arraylist, commandlinesupport, commandlinesupport, string, string, util

The ActiveMQ CommandLineSupport.java source code

/**
 * 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.
 */

import java.util.ArrayList;

import org.apache.activemq.util.IntrospectionSupport;

/**
 * Helper utility that can be used to set the properties on any object using
 * command line arguments.
 * 
 * @author <a href="http://hiramchirino.com">Hiram Chirino
 */
public final class CommandLineSupport {

    private 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 arguement type.  
     * 
     * @param target the object that will have it's properties set
     * @param args the commline options
     * @return any arguments that are not valid options for the target
     */
    public static 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;
                }
            }

        }

        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;
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ CommandLineSupport.java source code file:

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