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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
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package com.sun.enterprise.management.offline;

import java.util.Map;
import java.util.HashMap;


import com.sun.appserv.management.base.AMXDebug;


import com.sun.enterprise.config.ConfigContext;
import com.sun.enterprise.config.ConfigBean;
import com.sun.enterprise.config.ConfigException;

import com.sun.enterprise.config.impl.ConfigContextImpl;


/**
    Factory for creating ConfigBeanHelpers.
    Although they can be instantiated directly, failure to use
    the factory means that certain special cases won't be dealt with.
 */
final class ConfigBeanHelperFactory
{
    private final ConfigContext mConfigContext;
    private final Map<String,ConfigBeanHelper>  mHelperCache;

    private static ConfigBeanHelperFactory INSTANCE    = null;
     
    private static Map<ConfigContext,ConfigBeanHelperFactory>   mFactories;
    
        private
    ConfigBeanHelperFactory( final ConfigContext configContext)
    {
        mConfigContext  = configContext;
        mHelperCache    = new HashMap<String,ConfigBeanHelper>();
    }

        private void
    debug( final Object o )
    {
        AMXDebug.getInstance().getOutput( "ConfigBeanHelperFactory" ).println( o );
    }
    
       protected void
	sdebug( Object o )
	{
	    debug( o );
	    System.out.println( "" + o );
	}
	
	    public static synchronized ConfigBeanHelperFactory
	getInstance( final ConfigContext configContext )
	{
        if ( mFactories == null )
        {
            mFactories  = new HashMap<ConfigContext,ConfigBeanHelperFactory>();
        }

        ConfigBeanHelperFactory   instance    = mFactories.get( configContext );
	    if ( instance == null )
	    {
	        instance    = new ConfigBeanHelperFactory( configContext );
	        mFactories.put( configContext, instance );
	    }

	    return instance;
	}
	
        private ConfigBeanHelper
    createHelper( final String xPath )
        throws ConfigException
    {
        ConfigBeanHelper    helper  = null;
        final String        type = ConfigBeanHelper._getType( xPath );
        
        final ConfigBean    configBean  = mConfigContext.exactLookup( xPath );
        if ( configBean == null )
        {
            throw new IllegalArgumentException( 
                "Null configBean returned for type: " + type );
        }
        
        if ( "auth-realm".equals( type ) )
        {
            helper  = new AuthRealmConfigBeanHelper( mConfigContext, configBean );
        }
        else if ( "security-map".equals( type ) )
        {
            helper  = new SecurityMapConfigBeanHelper( mConfigContext, configBean );
        }
        else if ( "java-config".equals( type ) )
        {
            helper  = new JavaConfigConfigBeanHelper( mConfigContext, configBean );
        }
        else
        {
            helper  = new StdConfigBeanHelper( mConfigContext, configBean );
        }
        
        debug( "CREATED: " + xPath );
        
        return helper;
    }
    
        public ConfigBeanHelper
    getHelper( final String xPath )
        throws ConfigException
    {
        if ( xPath == null )
        {
            throw new IllegalArgumentException( "null xPath" );
        }
        
        ConfigBeanHelper    helper  = mHelperCache.get( xPath );
        
        if ( helper == null )
        {
            helper  = createHelper( xPath );
            
            mHelperCache.put( xPath, helper );
        }
        
        return helper;
    }

        public ConfigBeanHelper
    getHelper( final ConfigBean configBean )
    {
        try
        {
            return getHelper( configBean.getXPath() );
        }
        catch( Exception e )
        {
            throw new RuntimeException( e );
        }
    }
}