Example usage for java.lang.reflect Constructor newInstance

List of usage examples for java.lang.reflect Constructor newInstance

Introduction

In this page you can find the example usage for java.lang.reflect Constructor newInstance.

Prototype

@CallerSensitive
@ForceInline 
public T newInstance(Object... initargs) throws InstantiationException, IllegalAccessException,
        IllegalArgumentException, InvocationTargetException 

Source Link

Document

Uses the constructor represented by this Constructor object to create and initialize a new instance of the constructor's declaring class, with the specified initialization parameters.

Usage

From source file:com.miraclelinux.historygluon.HistoryGluon.java

public static void main(String[] args) throws Exception {
    m_log = LogFactory.getLog(HistoryGluon.class);
    m_log.info("HistoryGluon, MIRACLE LINUX Corp. 2012");

    if (!parseArgs(args))
        return;/*w  ww  .  j a va  2s . c  o m*/

    StorageDriver driver = null;
    String prefix = "com.miraclelinux.historygluon.";
    String driverName = prefix + m_storageName + "Driver";
    try {
        Class<?> c = Class.forName(driverName);
        Class[] argTypes = { String[].class };
        Constructor constructor = c.getConstructor(argTypes);
        Object[] driverArgs = { m_storageDriverArgs };
        driver = (StorageDriver) constructor.newInstance(driverArgs);
    } catch (ClassNotFoundException e) {
        m_log.error("Unknown Storage Type: " + m_storageName);
        printUsage();
        return;
    } catch (Exception e) {
        throw e;
    }

    if (!driver.init()) {
        m_log.fatal("Failed to initialize Storage Driver.");
        return;
    }
    m_log.info("StorageDriver: " + driver.getName());

    if (m_isDeleteDBMode) {
        m_log.info("try to deleted DB...");
        if (driver.deleteDB())
            m_log.info("Success: Deleted DB");
        else
            m_log.info("Failed: Deleted DB");
        driver.close();
        return;
    }

    ConnectionThread connectionThread = new ConnectionThread(DEFAULT_PORT, driver);
    connectionThread.start();
    driver.close();
}

From source file:com.browseengine.bobo.index.MakeBobo.java

/**
 * @param args/* w w w .  ja v  a 2 s .com*/
 */
public static void main(String[] args) throws IOException {
    // TODO Auto-generated method stub

    Option help = new Option("help", false, "print this message");

    OptionBuilder.withArgName("path");
    OptionBuilder.hasArg();
    OptionBuilder.withDescription("data source - required");
    Option src = OptionBuilder.create("source");
    src.setRequired(true);

    OptionBuilder.withArgName("path");
    OptionBuilder.hasArg();
    OptionBuilder.withDescription("index to create - required");
    Option index = OptionBuilder.create("index");
    index.setRequired(true);

    OptionBuilder.withArgName("file");
    OptionBuilder.hasArg();
    OptionBuilder.withDescription("field configuration - optional");
    Option conf = OptionBuilder.create("conf");

    OptionBuilder.withArgName("class");
    OptionBuilder.hasArg();
    OptionBuilder.withDescription("class name of the data digester - default: xml digester");
    Option digesterOpt = OptionBuilder.create("digester");

    OptionBuilder.withArgName("name");
    OptionBuilder.hasArg();
    OptionBuilder.withDescription("character set name - default: UTF-8");
    Option charset = OptionBuilder.create("charset");

    OptionBuilder.withArgName("maxdocs");
    OptionBuilder.hasArg();
    OptionBuilder.withDescription("maximum number of documents - default: 100");
    Option maxdocs = OptionBuilder.create("maxdocs");

    Options options = new Options();
    options.addOption(help);
    options.addOption(conf);
    options.addOption(index);
    options.addOption(src);
    options.addOption(charset);
    options.addOption(digesterOpt);
    options.addOption(maxdocs);

    //       create the parser

    CommandLineParser parser = new BasicParser();
    try {
        // parse the command line arguments
        CommandLine line = parser.parse(options, args);
        String output = line.getOptionValue("index");
        File data = new File(line.getOptionValue("source"));

        Class digesterClass;
        if (line.hasOption("digester"))
            digesterClass = Class.forName(line.getOptionValue("digester"));
        else
            throw new RuntimeException("digester not specified");

        Charset chset;
        if (line.hasOption("charset")) {
            chset = Charset.forName(line.getOptionValue("charset"));
        } else {
            chset = Charset.forName("UTF-8");
        }

        int maxDocs;
        try {
            maxDocs = Integer.parseInt(line.getOptionValue("maxdocs"));
        } catch (Exception e) {
            maxDocs = 100;
        }

        FileDigester digester;
        try {
            Constructor constructor = digesterClass.getConstructor(new Class[] { File.class });
            digester = (FileDigester) constructor.newInstance(new Object[] { data });
            digester.setCharset(chset);
            digester.setMaxDocs(maxDocs);
        } catch (Exception e) {
            throw new RuntimeException("Invalid digester class.", e);
        }

        BoboIndexer indexer = new BoboIndexer(digester, FSDirectory.open(new File(output)));
        indexer.index();
    } catch (ParseException exp) {
        exp.printStackTrace();
        usage(options);
    } catch (ClassNotFoundException e) {
        System.out.println("Invalid digester class.");
        usage(options);
    }
}

From source file:org.apache.asterix.experiment.client.LSMExperimentSetRunner.java

public static void main(String[] args) throws Exception {
    java.util.logging.Logger.getLogger("org.apache.http.headers").setLevel(Level.FINEST);
    //        LogManager.getRootLogger().setLevel(org.apache.log4j.Level.OFF);
    LSMExperimentSetRunnerConfig config = new LSMExperimentSetRunnerConfig(
            String.valueOf(System.currentTimeMillis()), 3);
    CmdLineParser clp = new CmdLineParser(config);
    try {//from   w w w  .  j ava  2 s .c o m
        clp.parseArgument(args);
    } catch (CmdLineException e) {
        System.err.println(e.getMessage());
        clp.printUsage(System.err);
        System.exit(1);
    }

    final String pkg = "org.apache.asterix.experiment.builder.suite";
    Reflections reflections = //new Reflections("org.apache.asterix.experiment.builder.suite");
            new Reflections(new ConfigurationBuilder().setUrls(ClasspathHelper.forPackage(pkg))
                    .filterInputsBy(new FilterBuilder().includePackage(pkg))
                    .setScanners(new TypeElementsScanner().publicOnly(), new MethodParameterScanner()));
    Map<String, AbstractLSMBaseExperimentBuilder> nameMap = new TreeMap<>();
    for (Constructor c : reflections.getConstructorsMatchParams(LSMExperimentSetRunnerConfig.class)) {
        AbstractLSMBaseExperimentBuilder b = (AbstractLSMBaseExperimentBuilder) c.newInstance(config);
        nameMap.put(b.getName(), b);
    }

    Pattern p = config.getRegex() == null ? null : Pattern.compile(config.getRegex());

    SequentialActionList exps = new SequentialActionList();
    for (Map.Entry<String, AbstractLSMBaseExperimentBuilder> e : nameMap.entrySet()) {
        if (p == null || p.matcher(e.getKey()).matches()) {
            exps.add(e.getValue().build());
            if (LOGGER.isLoggable(Level.INFO)) {
                LOGGER.info("Added " + e.getKey() + " to run list...");
            }
        }
    }
    exps.perform();
}

From source file:is.hi.bok.deduplicator.DigestIndexer.java

@SuppressWarnings({ "unchecked", "rawtypes" })
public static void main(String[] args) throws Exception {
    CommandLineParser clp = new CommandLineParser(args, new PrintWriter(System.out));
    long start = System.currentTimeMillis();

    // Set default values for all settings.
    boolean etag = false;
    boolean equivalent = false;
    boolean timestamp = false;
    String indexMode = MODE_BOTH;
    boolean addToIndex = false;
    String mimefilter = "^text/.*";
    boolean blacklist = true;
    String iteratorClassName = CrawlLogIterator.class.getName();
    String origin = null;/*  w w  w.  j  a va  2  s .  c o  m*/
    boolean skipDuplicates = false;

    // Process the options
    Option[] opts = clp.getCommandLineOptions();
    for (int i = 0; i < opts.length; i++) {
        Option opt = opts[i];
        switch (opt.getId()) {
        case 'w':
            blacklist = false;
            break;
        case 'a':
            addToIndex = true;
            break;
        case 'e':
            etag = true;
            break;
        case 'h':
            clp.usage(0);
            break;
        case 'i':
            iteratorClassName = opt.getValue();
            break;
        case 'm':
            mimefilter = opt.getValue();
            break;
        case 'o':
            indexMode = opt.getValue();
            break;
        case 's':
            equivalent = true;
            break;
        case 't':
            timestamp = true;
            break;
        case 'r':
            origin = opt.getValue();
            break;
        case 'd':
            skipDuplicates = true;
            break;
        default:
            System.err.println("Unhandled option id: " + opt.getId());
        }
    }

    List cargs = clp.getCommandLineArguments();

    if (cargs.size() != 2) {
        // Should be exactly two arguments. Source and target!
        clp.usage(0);
    }

    // Get the CrawlDataIterator
    // Get the iterator classname or load default.
    Class cl = Class.forName(iteratorClassName);
    Constructor co = cl.getConstructor(new Class[] { String.class });
    CrawlDataIterator iterator = (CrawlDataIterator) co.newInstance(new Object[] { (String) cargs.get(0) });

    // Print initial stuff
    System.out.println("Indexing: " + cargs.get(0));
    System.out.println(" - Mode: " + indexMode);
    System.out.println(" - Mime filter: " + mimefilter + " (" + (blacklist ? "blacklist" : "whitelist") + ")");
    System.out.println(" - Includes" + (equivalent ? " <equivalent URL>" : "")
            + (timestamp ? " <timestamp>" : "") + (etag ? " <etag>" : ""));
    System.out.println(" - Skip duplicates: " + (skipDuplicates ? "yes" : "no"));
    System.out.println(" - Iterator: " + iteratorClassName);
    System.out.println("   - " + iterator.getSourceType());
    System.out.println("Target: " + cargs.get(1));
    if (addToIndex) {
        System.out.println(" - Add to existing index (if any)");
    } else {
        System.out.println(" - New index (erases any existing index at " + "that location)");
    }

    DigestIndexer di = new DigestIndexer((String) cargs.get(1), indexMode, equivalent, timestamp, etag,
            addToIndex);

    // Create the index
    di.writeToIndex(iterator, mimefilter, blacklist, origin, true, skipDuplicates);

    // Clean-up
    di.close();

    System.out.println("Total run time: "
            + ArchiveUtils.formatMillisecondsToConventional(System.currentTimeMillis() - start));
}

From source file:Cresendo.java

public static void main(String[] args) {
    String cfgFileReceiver = null; // Path to config file for eif receiver agent
    String cfgFileEngine = null; // Path to config file for xml event engine
    Options opts = null; // Command line options
    HelpFormatter hf = null; // Command line help formatter

    // Setup the message record which will contain text written to the log file
    ////from   w  w w.  j a  v  a 2  s  . c  o m
    // The message logger object is created when the "-l" is processed
    // as this object need to be associated with a log file
    //
    LogRecord msg = new LogRecord(LogRecord.TYPE_INFO, "Cresendo", "main", "", "", "", "", "");

    // Get the directory separator (defaults to "/")
    //
    dirSep = System.getProperty("file.separator", "/");

    // Initialise the structure containing the event handler objects
    //
    Vector<IEventHandler> eventHandler = new Vector<IEventHandler>(10, 10);

    // Process the command line arguments
    //
    try {
        opts = new Options();
        hf = new HelpFormatter();

        opts.addOption("h", "help", false, "Command line arguments help");
        opts.addOption("i", "instance name", true, "Name of cresendo instance");
        opts.addOption("l", "log dir", true, "Path to log file directory");
        opts.addOption("c", "config dir", true, "Path to configuarion file directory");

        opts.getOption("l").setRequired(true);
        opts.getOption("c").setRequired(true);

        BasicParser parser = new BasicParser();
        CommandLine cl = parser.parse(opts, args);

        // Print out some help and exit
        //
        if (cl.hasOption('h')) {
            hf.printHelp("Options", opts);
            System.exit(0);
        }

        // Set the instance name
        //
        if (cl.hasOption('i')) {
            instanceName = cl.getOptionValue('i'); // Set to something other than "default"
        }

        // Setup the message and trace logging objects for the EventEngine
        //
        if (cl.hasOption('l')) {
            // Setup the the paths to the message, trace and status log files
            //
            logDir = cl.getOptionValue("l");

            logPath = logDir + dirSep + instanceName + "-engine.log";
            tracePath = logDir + dirSep + instanceName + "-engine.trace";
            statusPath = logDir + dirSep + instanceName + "-engine.status";
        } else {
            // NOTE:  This should be picked up by the MissingOptionException catch below
            //        but I couldn't get this to work so I added the following code:
            //
            hf.printHelp("Option 'l' is a required option", opts);
            System.exit(1);
        }

        // Read the receiver and engine config files in the config directory
        //
        if (cl.hasOption('c')) {
            // Setup and check path to eif config file for TECAgent receiver object
            //
            configDir = cl.getOptionValue("c");
            cfgFileReceiver = configDir + dirSep + instanceName + ".conf";
            checkConfigFile(cfgFileReceiver);

            // Setup and check path to xml config file for the EventEngine
            //
            cfgFileEngine = cl.getOptionValue("c") + dirSep + instanceName + ".xml";
            checkConfigFile(cfgFileEngine);

        } else {
            // NOTE:  This should be picked up by the MissingOptionException catch below
            //        but I couldn't get this to work so I added the following code:
            //
            hf.printHelp("Option 'c' is a required option", opts);
            System.exit(1);
        }
    } catch (UnrecognizedOptionException e) {
        hf.printHelp(e.toString(), opts);
        System.exit(1);
    } catch (MissingOptionException e) {
        hf.printHelp(e.toString(), opts);
        System.exit(1);
    } catch (MissingArgumentException e) {
        hf.printHelp(e.toString(), opts);
        System.exit(1);
    } catch (ParseException e) {
        e.printStackTrace();
        System.exit(1);
    } catch (Exception e) {
        System.err.println(e.toString());
        System.exit(1);
    }

    // Main program
    //
    try {
        // =====================================================================
        // Setup the message, trace and status logger objects
        //
        try {
            msgHandler = new FileHandler("cresendo", "message handler", logPath);
            msgHandler.openDevice();

            msgLogger = new MessageLogger("cresendo", "message log");
            msgLogger.addHandler(msgHandler);

            trcHandler = new FileHandler("cresendo", "trace handler", tracePath);
            trcHandler.openDevice();

            trcLogger = new TraceLogger("cresendo", "trace log");
            trcLogger.addHandler(trcHandler);

            statLogger = new StatusLogger(statusPath);
        } catch (Exception e) {
            System.err.println(e.toString());
            System.exit(1);
        }

        // Add the shutdown hook
        //
        Runtime.getRuntime().addShutdownHook(new ShutdownThread(msgLogger, instanceName));

        // ---------------------------------------------------------------------
        // =====================================================================
        // Load and parse the xml event engine configuration file
        //
        //
        msg.setText("Loading xml engine from: '" + cfgFileEngine + "'");

        try {
            XMLConfiguration xmlProcessor = new XMLConfiguration();
            xmlProcessor.setFileName(cfgFileEngine);

            // Validate the xml against a document type declaration
            //
            xmlProcessor.setValidating(true);

            // Don't interpolate the tag contents by splitting them on a delimiter
            // (ie by default a comma)
            //
            xmlProcessor.setDelimiterParsingDisabled(true);

            // This will throw a ConfigurationException if the xml document does not
            // conform to its dtd.  By doing this we hopefully catch any errors left
            // behind after the xml configuration file has been edited.
            //
            xmlProcessor.load();

            // Setup the trace flag
            //
            ConfigurationNode engine = xmlProcessor.getRootNode();
            List rootAttribute = engine.getAttributes();

            for (Iterator it = rootAttribute.iterator(); it.hasNext();) {
                ConfigurationNode attr = (ConfigurationNode) it.next();

                String attrName = attr.getName();
                String attrValue = (String) attr.getValue();

                if (attrValue == null || attrValue == "") {
                    System.err.println("\n  Error: The value of the attribute '" + attrName + "'"
                            + "\n         in the xml file '" + cfgFileEngine + "'" + "\n         is not set");
                    System.exit(1);
                }

                if (attrName.matches("trace")) {
                    if (attrValue.matches("true") || attrValue.matches("on")) {
                        trcLogger.setLogging(true);
                    }
                }

                if (attrName.matches("status")) {
                    if (attrValue.matches("true") || attrValue.matches("on")) {
                        statLogger.setLogging(true);
                    } else {
                        statLogger.setLogging(false);
                    }
                }

                if (attrName.matches("interval")) {
                    if (!attrValue.matches("[0-9]+")) {
                        System.err.println("\n  Error: The value of the interval attribute in: '"
                                + cfgFileEngine + "'" + "\n         should only contain digits from 0 to 9."
                                + "\n         It currently contains: '" + attrValue + "'");
                        System.exit(1);
                    }

                    statLogger.setInterval(Integer.parseInt(attrValue));
                }
            }

            // Now build and instantiate the list of classes that will process events
            // received by the TECAgent receiver in a chain like manner.
            //
            List classes = xmlProcessor.configurationsAt("class");

            for (Iterator it = classes.iterator(); it.hasNext();) {
                HierarchicalConfiguration sub = (HierarchicalConfiguration) it.next();

                // sub contains now all data contained in a single <class></class> tag set
                //
                String className = sub.getString("name");

                // Log message
                //
                msg.setText(msg.getText() + "\n  Instantiated event handler class: '" + className + "'");

                // The angle brackets describing the class of object held by the
                // Vector are implemented by Java 1.5 and have 2 effects.
                //
                // 1. The list accepts only elements of that class and nothing else
                // (Of course thanks to Auto-Wrap you can also add double-values)
                //
                // 2. the get(), firstElement() ... Methods don't return a Object, but
                //    they deliver an element of the class.
                //
                Vector<Class> optTypes = new Vector<Class>(10, 10);
                Vector<Object> optValues = new Vector<Object>(10, 10);

                for (int i = 0; i <= sub.getMaxIndex("option"); i++) {
                    Object optValue = null;
                    String optVarName = sub.getString("option(" + i + ")[@varname]");
                    String optJavaType = sub.getString("option(" + i + ")[@javatype]");

                    // Use the specified java type in order to make the method call
                    // to the heirarchical sub object [painful :-((]
                    //
                    if (optJavaType.matches("byte")) {
                        optTypes.addElement(byte.class);
                        optValue = sub.getByte("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = 0; // Set to something nullish
                        }
                    } else if (optJavaType.matches("short")) {
                        optTypes.addElement(byte.class);
                        optValue = sub.getShort("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = 0; // Set to something nullish
                        }
                    } else if (optJavaType.matches("int")) {
                        optTypes.addElement(int.class);
                        optValue = sub.getInt("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = 0; // Set to something nullish
                        }
                    } else if (optJavaType.matches("long")) {
                        optTypes.addElement(long.class);
                        optValue = sub.getLong("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = 0; // Set to something nullish
                        }
                    } else if (optJavaType.matches("float")) {
                        optTypes.addElement(float.class);
                        optValue = sub.getFloat("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = 0.0; // Set to something nullish
                        }
                    } else if (optJavaType.matches("double")) {
                        optTypes.addElement(double.class);
                        optValue = sub.getDouble("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = 0.0; // Set to something nullish
                        }
                    } else if (optJavaType.matches("boolean")) {
                        optTypes.addElement(boolean.class);
                        optValue = sub.getBoolean("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = false; // Set to something nullish
                        }
                    } else if (optJavaType.matches("String")) {
                        optTypes.addElement(String.class);
                        optValue = sub.getString("option(" + i + ")");

                        if (optValue == null) // Catch nulls
                        {
                            optValue = ""; // Set it to something nullish
                        }
                    } else {
                        System.err.println(
                                "Error: Unsupported java type found in xml config: '" + optJavaType + "'");
                        System.exit(1);
                    }

                    // Add option value element
                    //
                    //              System.out.println("Option value is: '" + optValue.toString() + "'\n");
                    //
                    optValues.addElement(optValue);

                    // Append to message text
                    //
                    String msgTemp = msg.getText();
                    msgTemp += "\n      option name: '" + optVarName + "'";
                    msgTemp += "\n      option type: '" + optJavaType + "'";
                    msgTemp += "\n     option value: '" + optValues.lastElement().toString() + "'";
                    msg.setText(msgTemp);
                }

                try {
                    // Instantiate the class with the java reflection api
                    //
                    Class klass = Class.forName(className);

                    // Setup an array of paramater types in order to retrieve the matching constructor
                    //
                    Class[] types = optTypes.toArray(new Class[optTypes.size()]);

                    // Get the constructor for the class which matches the parameter types
                    //
                    Constructor konstruct = klass.getConstructor(types);

                    // Create an instance of the event handler
                    //
                    IEventHandler eventProcessor = (IEventHandler) konstruct.newInstance(optValues.toArray());

                    // Add the instance to the list of event handlers
                    //
                    eventHandler.addElement(eventProcessor);

                } catch (InvocationTargetException e) {
                    System.err.println("Error: " + e.toString());
                    System.exit(1);
                } catch (ClassNotFoundException e) {
                    System.err.println("Error: class name not found: '" + className + "' \n" + e.toString());
                    System.exit(1);
                } catch (Exception e) {
                    System.err.println(
                            "Error: failed to instantiate class: '" + className + "' \n" + e.toString());
                    System.exit(1);
                }
            }
        } catch (ConfigurationException cex) // Something went wrong loading the xml file
        {
            System.err.println("\n" + "Error loading XML file: " + cfgFileEngine + "\n" + cex.toString());
            System.exit(1);
        } catch (Exception e) {
            System.err.println(e.toString());
            System.exit(1);
        }

        // ---------------------------------------------------------------------
        // =====================================================================
        // Setup the TECAgent receiver 
        // 
        Reader cfgIn = null;

        try {
            cfgIn = new FileReader(cfgFileReceiver);
        } catch (Exception e) {
            System.err.println(e.toString());
            System.exit(1);
        }

        // Start the TECAgent receiver and register the event engine handler
        //
        TECAgent receiver = new TECAgent(cfgIn, TECAgent.RECEIVER_MODE, false);

        EventEngine ee = new EventEngine(eventHandler, msgLogger, trcLogger);

        receiver.registerListener(ee);

        // Construct message and send it to the message log
        //
        String text = "\n  Cresendo instance '" + instanceName + "' listening for events on port '"
                + receiver.getConfigVal("ServerPort") + "'";

        msg.setText(msg.getText() + text);
        msgLogger.log(msg); // Send message to log

        // ---------------------------------------------------------------------
        // =====================================================================
        // Initiate status logging
        //
        if (statLogger.isLogging()) {
            int seconds = statLogger.getInterval();

            while (true) {
                try {
                    statLogger.log();
                } catch (Exception ex) {
                    System.err.println("\n  An error occurred while writing to '" + statusPath + "'" + "\n  '"
                            + ex.toString() + "'");
                }

                Thread.sleep(seconds * 1000); // Convert sleep time to milliseconds
            }
        }

        // ---------------------------------------------------------------------
    } catch (Exception e) {
        System.err.println(e.toString());
        System.exit(1);
    }
}

From source file:Main.java

private static Object getInstance(String name, Class<?> classParas[], Object paras[]) {
    Object o = null;//from   w ww.  ja  va  2  s  . c  o  m
    try {
        Class<?> c = Class.forName(name);
        Constructor<?> con = c.getConstructor(classParas);
        o = con.newInstance(paras);
    } catch (Exception ex) {
    }

    return o;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static Object newInstance(Class _Class, int constructorIndex, Object... args) throws Exception {
    Constructor cons = _Class.getConstructors()[constructorIndex];
    return cons.newInstance(args);
}

From source file:Main.java

private static <T> Collection<T> newCollection(Collection<T> coll) {
    try {//from w  w  w.  j ava2s  .com
        Class cl = coll.getClass();
        Constructor con = cl.getConstructor(new Class[0]);
        return (Collection<T>) con.newInstance(new Object[0]);
    } catch (Exception e) {
        if (coll instanceof List)
            return new LinkedList<T>();
        if (coll instanceof Set)
            return new HashSet<T>();
        throw new RuntimeException("Cannot handle this collection");
    }
}

From source file:Main.java

static public Object newInstance(String className, Object... args) throws Exception {
    Class<?> newoneClass = Class.forName(className);
    Class<?>[] argsClass = null;

    if (args != null && args.length > 0) {
        argsClass = new Class<?>[args.length];

        for (int i = 0, j = args.length; i < j; i++) {
            argsClass[i] = args[i].getClass();
            if (argsClass[i] == Integer.class) {
                argsClass[i] = int.class;
            } else if (argsClass[i] == Boolean.class) {
                argsClass[i] = boolean.class;
            }/*ww w . jav a2  s .c  o  m*/
        }
    }

    Constructor<?> cons = newoneClass.getConstructor(argsClass);

    return cons.newInstance(args);
}

From source file:Main.java

public static Object newHandlerInstance(String clzPath, Class<?>[] parameterTypes, Object[] args) {
    try {//from  w  w w.jav a 2s.  c  o  m
        Class<?> clz = Class.forName(clzPath);
        Constructor<?> constructor = clz.getConstructor(parameterTypes);
        return constructor.newInstance(args);
    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (InstantiationException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
    return null;
}