Examples of org.apache.commons.discovery.DiscoveryException

org.apache.commons.discovery.DiscoveryException
An exception that is thrown only if a suitable service instance cannot be created by {@code ServiceFactory}. @version $Revision: 1088947 $ $Date: 2011-04-05 11:51:19 +0200 (Tue, 05 Apr 2011) $

            if (defaultImpl != null) {
                return defaultImpl.getDefaultClass(spi, loaders);
            }
        }
        
        throw new DiscoveryException("No implementation defined for " + spi.getSPName());
    }

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                                                              setLogParamClasses);
            
            if (setLog == null) {
                String msg = "Internal Error: " + clazz.getName() + " required to implement 'public static void setLog(Log)'";
                log.fatal(msg);
                throw new DiscoveryException(msg);
            }
        } catch (SecurityException se) {
            String msg = "Required Security Permissions not present";
            log.fatal(msg, se);
            throw new DiscoveryException(msg, se);
        }


        if (log.isDebugEnabled())
            log.debug("Class meets requirements: " + clazz.getName());

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                try {
                    setLog = clazz.getMethod("setLog", setLogParamClasses);
                } catch(Exception e) {
                    String msg = "Internal Error: pre-check for " + clazz.getName() + " failed?!";
                    log.fatal(msg, e);
                    throw new DiscoveryException(msg, e);
                }
    
                Object[] setLogParam = new Object[] { factory.getInstance(clazz.getName()) };
                
                try {
                    setLog.invoke(null, setLogParam);
                } catch(Exception e) {
                    String msg = "Internal Error: setLog failed for " + clazz.getName();
                    log.fatal(msg, e);
                    throw new DiscoveryException(msg, e);
                }
            }
        }
    }

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               IllegalAccessException,
               NoSuchMethodException,
               InvocationTargetException
    {
        if (impl == null) {
            throw new DiscoveryException("No implementation defined for " + getSPName());
        }


        verifyAncestory(impl);            


        if (paramClasses == null || params == null) {

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     * Throws exception if <code>impl</code> does not
     * implement or extend the SPI.
     */
    public void verifyAncestory(Class impl) {
        if (!getSPClass().isAssignableFrom(impl)) {
            throw new DiscoveryException("Class " + impl.getName() +
                                         " does not implement " + getSPName());
        }
    }

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                    // ignore
                }
            }
        }
        
        throw new DiscoveryException("No implementation defined for " + spi.getSPName());
        // return null;
    }

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                    put(contextLoader, spi.getSPName(), obj);
                }
            } catch (DiscoveryException de) {
                throw de;
            } catch (Exception e) {
                throw new DiscoveryException("Unable to instantiate implementation class for " + spi.getSPName(), e);
            }
        }
        
        return obj;
    }

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     */
    public static void verifyAncestory(Class spi, Class impl)
        throws DiscoveryException
    {
        if (spi == null) {
            throw new DiscoveryException("No interface defined!");
        }


        if (impl == null) {
            throw new DiscoveryException("No implementation defined for " + spi.getName());
        }


        if (!spi.isAssignableFrom(impl)) {
            throw new DiscoveryException("Class " + impl.getName() +
                                         " does not implement " + spi.getName());
        }
    }

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                                                              setLogParamClasses);
            
            if (setLog == null) {
                String msg = "Internal Error: " + clazz.getName() + " required to implement 'public static void setLog(Log)'";
                log.fatal(msg);
                throw new DiscoveryException(msg);
            }
        } catch (SecurityException se) {
            String msg = "Required Security Permissions not present";
            log.fatal(msg, se);
            throw new DiscoveryException(msg, se);
        }


        if (log.isDebugEnabled())
            log.debug("Class meets requirements: " + clazz.getName());

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                try {
                    setLog = clazz.getMethod("setLog", setLogParamClasses);
                } catch(Exception e) {
                    String msg = "Internal Error: pre-check for " + clazz.getName() + " failed?!";
                    log.fatal(msg, e);
                    throw new DiscoveryException(msg, e);
                }
    
                Object[] setLogParam = new Object[] { factory.getInstance(clazz.getName()) };
                
                try {
                    setLog.invoke(null, setLogParam);
                } catch(Exception e) {
                    String msg = "Internal Error: setLog failed for " + clazz.getName();
                    log.fatal(msg, e);
                    throw new DiscoveryException(msg, e);
                }
            }
        }
    }

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Related Classes of org.apache.commons.discovery.DiscoveryException

org.apache.commons.discovery.log.DiscoveryLogFactory

org.apache.commons.discovery.tools.ClassUtils

org.apache.commons.discovery.tools.DiscoverClass

org.apache.commons.discovery.tools.DiscoverSingleton

org.apache.commons.discovery.tools.SPInterface

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