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/*
 * Copyright 2003 - 2012 The eFaps Team
 *
 * Licensed 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.
 *
 * Revision:        $Rev: 7483 $
 * Last Changed:    $Date: 2012-05-11 11:57:38 -0500 (Fri, 11 May 2012) $
 * Last Changed By: $Author: [email protected] $
 */

package org.efaps.init;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NameNotFoundException;
import javax.naming.NamingException;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Utility class for the init package to startup database connections and
 * stores.
 *
 * @author The eFaps Team
 * @version $Id: Util.java 7483 2012-05-11 16:57:38Z [email protected] $
 */
public final class Util
{
    /**
     * Logging instance used to give logging information of this class.
     */
    private static final Logger LOG = LoggerFactory.getLogger(Util.class);

    /**
     * Private constructor so that this utility class could not be
     * instantiated.
     */
    private Util()
    {
    }

    /**
     * Bing given object at the given name path within given name context.
     *
     * @param _ctx      naming context
     * @param _nameStr  string with complete name path
     * @param _object   object to bind
     * @throws NamingException if bind failed
     */
    public static void bind(final Context _ctx,
                            final String _nameStr,
                            final Object _object)
        throws NamingException
    {
        final Name names = _ctx.getNameParser("").parse(_nameStr);
        if (names.size() > 0)  {
            Context subCtx = _ctx;
            for (int idx = 0; idx < names.size() - 1; idx++)  {
                final String name = names.get(idx);
                try {
                    subCtx = (Context) subCtx.lookup(name);
                    if (Util.LOG.isDebugEnabled())  {
                        Util.LOG.debug("Subcontext " + name + " already exists");
                    }
                } catch (final NameNotFoundException e) {
                    subCtx = subCtx.createSubcontext(name);
                    if (Util.LOG.isDebugEnabled())  {
                        Util.LOG.debug("Subcontext " + name + " created");
                    }
                }
            }
            subCtx.rebind(names.get(names.size() - 1), _object);
            if (Util.LOG.isDebugEnabled())  {
                Util.LOG.debug("Bound object to " + names.get(names.size() - 1));
            }
        }
    }

    /**
     * Unbinds given _nameStr from _ctx.
     *
     * @param _ctx      naming context
     * @param _nameStr  name to unbind
     * @throws NamingException if unbind failed
     */
    public static void unbind(final Context _ctx,
                              final String _nameStr)
        throws NamingException
    {
        final Name names = _ctx.getNameParser("").parse(_nameStr);
        if (names.size() > 0)  {
            _ctx.unbind(names);
        }
    }
}