/*
 * JBoss, Home of Professional Open Source
 * Copyright 2007, Red Hat Middleware LLC, and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.deployment.dependency;

import javax.naming.InitialContext;
import javax.naming.NameNotFoundException;

import org.jboss.dependency.plugins.AbstractDependencyItem;
import org.jboss.dependency.spi.Controller;
import org.jboss.dependency.spi.ControllerState;
import org.jboss.dependency.spi.DependencyItem;
import org.jboss.logging.Logger;
import org.jboss.util.JBossStringBuilder;

/**
 * Dependency on a jndi name
 * 
 * @author Scott.Stark@jboss.org
 * @version $Revision: 85945 $
 */
public class JndiDependencyItem extends AbstractDependencyItem
   implements DependencyItem
{
   private static final Logger log = Logger.getLogger(JndiDependencyItem.class);

   /** The demand jndi name */
   private String jndiName;
   /** The jndi name lookup value */
   private Object demand;
   /** The container class loader to use during lookup */
   private ClassLoader loader;
   
   /**
    * Create a demand for a jndi name lookup using the given class loader.
    * 
    * @param jndiName - the name to lookup
    * @param loader - the ClassLoader to use as the TCL during lookup.
    */
   public JndiDependencyItem(String jndiName, ClassLoader loader,
         ControllerState whenRequired)
   {
      super(jndiName, null, whenRequired, null);
      this.jndiName = jndiName;
      this.loader = loader;
   }

   public Object getDemand()
   {
      return demand;
   }

   @Override
   public boolean resolve(Controller controller)
   {
      ClassLoader tcl = Thread.currentThread().getContextClassLoader();
      try
      {
         Thread.currentThread().setContextClassLoader(loader);
         InitialContext ctx = new InitialContext();
         demand = ctx.lookup(jndiName);
         setResolved(true);
         return isResolved();
      }
      catch(NameNotFoundException e)
      {
         // ignore
      }
      catch(Throwable ignored)
      {
         if (log.isTraceEnabled())
            log.trace("Unexpected error", ignored);
      }
      finally
      {
         Thread.currentThread().setContextClassLoader(tcl);            
      }
      setResolved(false);
      return isResolved();
   }

   @Override
   public void toString(JBossStringBuilder buffer)
   {
      super.toString(buffer);
      buffer.append(" depend=").append(jndiName);
   }
   
   @Override
   public void toShortString(JBossStringBuilder buffer)
   {
      buffer.append(getName()).append(" depend ").append(jndiName);
   }

   @Override
   public String toHumanReadableString()
   {
      StringBuilder builder = new StringBuilder();
      builder.append("JndiDepends: '");
      builder.append(jndiName);
      builder.append("'");
      return builder.toString();
   }
}