/*
    * 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.myfaces.tobago.internal.util;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import javax.naming.Binding;
  import javax.naming.Context;
  import javax.naming.NamingEnumeration;
  import javax.naming.NamingException;
  
  public class JndiUtils {
  
    private static final Logger LOG = LoggerFactory.getLogger(JndiUtils.class);
  
    public static Object getJndiProperty(Context ctx, String... path) throws NamingException {
      return getJndiProperty(ctx, null, path);
    }
  
    public static Object getJndiProperty(Context ctx, Object defaultValue, String... path) throws NamingException {
      String name = "java:comp/env";
      // avoid error messages from websphere
      for (int i = 0; i < path.length; i++) {
        Binding b = getBinding(ctx, name, path[i]);
        if (b == null) {
          break;
        }
        if (i == path.length - 1) {
          Object obj = b.getObject();
          if (LOG.isDebugEnabled()) {
            LOG.debug("Value: " + obj);
          }
          return obj;
        } else {
          name = name + "/" + path[i];
        }
      }
      return defaultValue;
    }
  
    private static Binding getBinding(Context ctx, String name, String path)
        throws NamingException {
      NamingEnumeration<Binding> ne = ctx.listBindings(name);
      while (ne.hasMore()) {
        Binding b = ne.next();
        if (LOG.isDebugEnabled()) {
          LOG.debug("Property: " + b.getName());
        }
        if (path.equals(b.getName())) {
          return b;
        }
      }
      return null;
    }
  
  }