Examples with LookupRef org.apache.naming.LookupRef used on opensource projects

Example 1 with LookupRef

use of org.apache.naming.LookupRef in project tomcat by apache.

the class LookupFactory method getObjectInstance.

/**
 * Create a new Resource env instance.
 *
 * @param obj The reference object describing the DataSource
 */
@Override
public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable<?, ?> environment) throws Exception {
    String lookupName = null;
    Object result = null;
    if (obj instanceof LookupRef) {
        Reference ref = (Reference) obj;
        ObjectFactory factory = null;
        RefAddr lookupNameRefAddr = ref.get(LookupRef.LOOKUP_NAME);
        if (lookupNameRefAddr != null) {
            lookupName = lookupNameRefAddr.getContent().toString();
        }
        try {
            if (lookupName != null) {
                if (!names.get().add(lookupName)) {
                    String msg = sm.getString("lookupFactory.circularReference", lookupName);
                    NamingException ne = new NamingException(msg);
                    log.warn(msg, ne);
                    throw ne;
                }
            }
            RefAddr factoryRefAddr = ref.get(Constants.FACTORY);
            if (factoryRefAddr != null) {
                // Using the specified factory
                String factoryClassName = factoryRefAddr.getContent().toString();
                // Loading factory
                ClassLoader tcl = Thread.currentThread().getContextClassLoader();
                Class<?> factoryClass = null;
                if (tcl != null) {
                    try {
                        factoryClass = tcl.loadClass(factoryClassName);
                    } catch (ClassNotFoundException e) {
                        NamingException ex = new NamingException(sm.getString("lookupFactory.loadFailed"));
                        ex.initCause(e);
                        throw ex;
                    }
                } else {
                    try {
                        factoryClass = Class.forName(factoryClassName);
                    } catch (ClassNotFoundException e) {
                        NamingException ex = new NamingException(sm.getString("lookupFactory.loadFailed"));
                        ex.initCause(e);
                        throw ex;
                    }
                }
                if (factoryClass != null) {
                    try {
                        factory = (ObjectFactory) factoryClass.getConstructor().newInstance();
                    } catch (Throwable t) {
                        if (t instanceof NamingException) {
                            throw (NamingException) t;
                        }
                        NamingException ex = new NamingException(sm.getString("lookupFactory.createFailed"));
                        ex.initCause(t);
                        throw ex;
                    }
                }
            }
            // Note: No defaults here
            if (factory != null) {
                result = factory.getObjectInstance(obj, name, nameCtx, environment);
            } else {
                if (lookupName == null) {
                    throw new NamingException(sm.getString("lookupFactory.createFailed"));
                } else {
                    result = new InitialContext().lookup(lookupName);
                }
            }
            Class<?> clazz = Class.forName(ref.getClassName());
            if (result != null && !clazz.isAssignableFrom(result.getClass())) {
                String msg = sm.getString("lookupFactory.typeMismatch", name, ref.getClassName(), lookupName, result.getClass().getName());
                NamingException ne = new NamingException(msg);
                log.warn(msg, ne);
                // Close the resource we no longer need if we know how to do so
                if (result instanceof AutoCloseable) {
                    try {
                        ((AutoCloseable) result).close();
                    } catch (Exception e) {
                    // Ignore
                    }
                }
                throw ne;
            }
        } finally {
            names.get().remove(lookupName);
        }
    }
    return result;
}