Example usage for org.apache.commons.discovery.tools Service providers

Introduction

In this page you can find the example usage for org.apache.commons.discovery.tools Service providers.

Prototype

public static Enumeration providers(Class spiClass) 

Source Link

Document

as described in sun/jdk1.3.1/docs/guide/jar/jar.html#Service Provider, Except this uses Enumeration instead of Interator.

Usage

From source file:net.sf.joost.stx.TransformerHandlerResolverImpl.java

/**
 * Initialize the object//from ww w  .java 2 s.  c  o  m
 * It scans plugins directories and create a hashtable of all implemented
 * filter-methods and their factories.
 * In case of duplicated method implementations its behaviour is
 * defined by {link @flgName} system property.
 * @throws SAXException when duplicated method implementation is found
 * and has been asked to raise an exception
 */
private static synchronized void init() throws SAXException {

    // check again, in case this method has been called twice
    if (!notInitializedYet)
        return;

    if (DEBUG)
        log.debug("init() : entering");

    // system property which says what to do in case of
    // duplicated method implementations
    String prop = System.getProperty(flgName);
    if (DEBUG)
        log.debug(flgName + "=" + prop);
    int flg;
    // fail with exception if duplicate is found
    if ("fail".equalsIgnoreCase(prop))
        flg = FLAG_FAIL;
    // ignore duplicate and print info message
    else if ("ignore".equalsIgnoreCase(prop))
        flg = FLAG_IGNORE;
    // accept duplicate and print warning message
    else
        // just a warning and replace
        flg = FLAG_REPLACE;

    // plugin classes
    Enumeration clss = Service.providers(TransformerHandlerResolver.class);

    // loop over founded classes
    while (clss.hasMoreElements()) {
        TransformerHandlerResolver plg = (TransformerHandlerResolver) clss.nextElement();
        if (DEBUG)
            log.debug("scanning implemented stx-filter-methods of class" + plg.getClass());

        // lookup over implemented methods
        String[] uriMethods = plg.resolves();
        for (int i = 0; i < uriMethods.length; i++) {

            // method name (url)
            String mt = uriMethods[i];

            if (DEBUG)
                log.debug("stx-filter-method found : " + mt);

            // see if method is already defined by some other plugin ?
            TransformerHandlerResolver firstPlg = (TransformerHandlerResolver) plugins.get(mt);

            if (null != firstPlg) {
                String msg = "Plugin '" + plg.getClass() + "' implements stx-filter-method '" + mt
                        + "' which already has been implemented by '" + firstPlg.getClass().toString() + "'!";
                if (flg == FLAG_FAIL) {
                    if (DEBUG)
                        log.debug("plugin already implemented!");
                    throw new SAXException(msg);
                } else if (flg == FLAG_IGNORE) {
                    if (log != null)
                        log.warn(msg + "\nImplementation ignored, " + "using first plugin!");
                } else { // replace + warning
                    if (log != null)
                        log.warn(msg + "\nUsing new implementation, " + "previous plugin ignored!");
                    plugins.put(mt, plg);
                }
            } else {
                // add method to the hashtable
                plugins.put(mt, plg);
            }
        }

    }

    // revert init() flag
    notInitializedYet = false;

    if (DEBUG)
        log.debug("init() : exiting");
}

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From source file:ch.arrenbrecht.jcite.JCite.java

public JCite() {
    super();//from   w w  w  .j a v a 2 s . co  m
    registerCitelet(new JavaCitelet(this));
    registerCitelet(new PlainJavaCitelet(this));
    registerCitelet(new TextCitelet(this));
    registerCitelet(new PlainTextCitelet(this));
    registerCitelet(new RawTextCitelet(this));
    registerCitelet(new PathCitelet(this));
    registerCitelet(new IncludeCitelet(this));

    @SuppressWarnings("rawtypes") //
    final Enumeration providers = Service.providers(JCiteletProvider.class);
    while (providers.hasMoreElements()) {
        final JCiteletProvider provider = (JCiteletProvider) providers.nextElement();
        registerCitelet(provider.getCitelet(this));
    }
}

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From source file:org.soaplab.services.GenUtils.java

/*********************************************************************
 * Return an enumeration of instances of given class, as found by
 * the SPI mechanism (as described in/* ww  w  . j  av  a 2s. c  o m*/
 * sun/jdk1.3.1/docs/guide/jar/jar.html#Service Provider). <p>
 *
 * @param svc SPI to look for and load
 * @return instances of 'svc' (implementing it or extending it)
 ********************************************************************/
@SuppressWarnings("unchecked")
public static <SVC> Enumeration<SVC> spiProviders(Class<SVC> svc) {
    return Service.providers(svc);
}

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