content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You under the Apache License, Version 2.0
   * (the "License"); you may not use this file except in compliance with
   * the License.  You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.activemq.artemis.jndi;
  
  import javax.naming.Context;
  import javax.naming.Name;
  import javax.naming.NamingException;
  import javax.naming.Reference;
  import javax.naming.StringRefAddr;
  import javax.naming.spi.ObjectFactory;
  import java.util.Enumeration;
  import java.util.Hashtable;
  import java.util.Properties;
  
  /**
   * Converts objects implementing JNDIStorable into a property fields so they can be stored and regenerated from JNDI
   */
  public class JNDIReferenceFactory implements ObjectFactory {
  
     /**
      * This will be called by a JNDIprovider when a Reference is retrieved from a JNDI store - and generates the original
      * instance
      *
      * @param object      the Reference object
      * @param name        the JNDI name
      * @param nameCtx     the context
      * @param environment the environment settings used by JNDI
      * @return the instance built from the Reference object
      * @throws Exception if building the instance from Reference fails (usually class not found)
      */
     @Override
     public Object getObjectInstance(Object object, Name name, Context nameCtx, Hashtable<?, ?> environment)
           throws Exception {
        Object result = null;
        if (object instanceof Reference reference) {
           Class<?> theClass = loadClass(this, reference.getClassName());
           if (JNDIStorable.class.isAssignableFrom(theClass)) {
              JNDIStorable store = (JNDIStorable) theClass.getDeclaredConstructor().newInstance();
              store.setProperties(getProperties(reference));
              result = store;
           }
        } else {
           throw new RuntimeException("Object " + object + " is not a reference");
        }
        return result;
     }
  
     public static Properties getProperties(Reference reference) {
        Properties properties = new Properties();
        for (Enumeration iter = reference.getAll(); iter.hasMoreElements();) {
           StringRefAddr addr = (StringRefAddr)iter.nextElement();
           properties.put(addr.getType(), (addr.getContent() == null) ? "" : addr.getContent());
        }
        return properties;
     }
  
     /**
      * Create a Reference instance from a JNDIStorable object
      *
      * @param instanceClassName The name of the class that is being created.
      * @param po                The properties object to use when configuring the new instance.
      * @return Reference
      * @throws NamingException if an error occurs while creating the new instance.
      */
     public static Reference createReference(String instanceClassName, JNDIStorable po) throws NamingException {
        Reference result = new Reference(instanceClassName, JNDIReferenceFactory.class.getName(), null);
        try {
           Properties props = po.getProperties();
           for (Enumeration iter = props.propertyNames(); iter.hasMoreElements();) {
              String key = (String)iter.nextElement();
              result.add(new StringRefAddr(key, props.getProperty(key)));
           }
        } catch (Exception e) {
           throw new NamingException(e.getMessage());
        }
        return result;
     }
  
     /**
      * Retrieve the class loader for a named class
      *
      * @param thisObj   Local object to use when doing the lookup.
      * @param className The name of the class being loaded.
      * @return the class that was requested
      * @throws ClassNotFoundException if a matching class cannot be created.
      */
     public static Class<?> loadClass(Object thisObj, String className) throws ClassNotFoundException {
        // try local ClassLoader first.
        ClassLoader loader = thisObj.getClass().getClassLoader();
        Class<?> theClass;
        if (loader != null) {
           theClass = loader.loadClass(className);
        } else {
           // Will be null in jdk1.1.8
           // use default classLoader
           theClass = Class.forName(className);
        }
        return theClass;
     }
  }
  