Example usage for org.apache.commons.discovery.tools ClassUtils verifyAncestory

Introduction

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

Prototype

public static void verifyAncestory(Class spi, Class impl) throws DiscoveryException 

Source Link

Document

Throws exception if impl does not implement or extend the SPI.

Usage

From source file:org.apache.axis.AxisProperties.java

public static Object newInstance(final Class spiClass, final Class constructorParamTypes[],
        final Object constructorParams[]) {
    return AccessController.doPrivileged(new PrivilegedAction() {
        public Object run() {
            ResourceClassIterator services = getResourceClassIterator(spiClass);

            Object obj = null;// w ww . j  a v  a  2s .com
            while (obj == null && services.hasNext()) {
                Class service = services.nextResourceClass().loadClass();

                /* service == null
                 * if class resource wasn't loadable
                 */
                if (service != null) {
                    /* OK, class loaded.. attempt to instantiate it.
                     */
                    try {
                        ClassUtils.verifyAncestory(spiClass, service);
                        obj = ClassUtils.newInstance(service, constructorParamTypes, constructorParams);
                    } catch (InvocationTargetException e) {
                        if (e.getTargetException() instanceof java.lang.NoClassDefFoundError) {
                            log.debug(Messages.getMessage("exception00"), e);
                        } else {
                            log.warn(Messages.getMessage("exception00"), e);
                        }
                    } catch (Exception e) {
                        log.warn(Messages.getMessage("exception00"), e);
                    }
                }
            }

            return obj;
        }
    });
}

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