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/*
* Distributed as part of c3p0 v.0.9.1.1
*
* Copyright (C) 2005 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1, as
* published by the Free Software Foundation.
*
* 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; see the file LICENSE. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
package io.logspace.agent.shaded.mchange.v2.naming;
import java.net.*;
import javax.naming.*;
import io.logspace.agent.shaded.mchange.v2.log.MLevel;
import io.logspace.agent.shaded.mchange.v2.log.MLog;
import io.logspace.agent.shaded.mchange.v2.log.MLogger;
import javax.naming.spi.ObjectFactory;
import java.util.Hashtable;
public final class ReferenceableUtils
{
final static MLogger logger = MLog.getLogger( ReferenceableUtils.class );
/* don't worry -- References can have duplicate RefAddrs (I think!) */
final static String REFADDR_VERSION = "version";
final static String REFADDR_CLASSNAME = "classname";
final static String REFADDR_FACTORY = "factory";
final static String REFADDR_FACTORY_CLASS_LOCATION = "factoryClassLocation";
final static String REFADDR_SIZE = "size";
final static int CURRENT_REF_VERSION = 1;
/**
* A null string value in a Reference sometimes goes to the literal
* "null". Sigh. We convert this string to a Java null.
*/
public static String literalNullToNull( String s )
{
if (s == null || "null".equals( s ))
return null;
else
return s;
}
public static Object referenceToObject( Reference ref, Name name, Context nameCtx, Hashtable env)
throws NamingException
{
try
{
String fClassName = ref.getFactoryClassName();
String fClassLocation = ref.getFactoryClassLocation();
ClassLoader cl;
if ( fClassLocation == null )
cl = ClassLoader.getSystemClassLoader();
else
{
URL u = new URL( fClassLocation );
cl = new URLClassLoader( new URL[] { u }, ClassLoader.getSystemClassLoader() );
}
Class fClass = Class.forName( fClassName, true, cl );
ObjectFactory of = (ObjectFactory) fClass.newInstance();
return of.getObjectInstance( ref, name, nameCtx, env );
}
catch ( Exception e )
{
if (Debug.DEBUG)
{
//e.printStackTrace();
if ( logger.isLoggable( MLevel.FINE ) )
logger.log( MLevel.FINE, "Could not resolve Reference to Object!", e);
}
NamingException ne = new NamingException("Could not resolve Reference to Object!");
ne.setRootCause( e );
throw ne;
}
}
/**
* @deprecated nesting references seemed useful until I realized that
* references are Serializable and can be stored in a BinaryRefAddr.
* Oops.
*/
public static void appendToReference(Reference appendTo, Reference orig)
throws NamingException
{
int len = orig.size();
appendTo.add( new StringRefAddr( REFADDR_VERSION, String.valueOf( CURRENT_REF_VERSION ) ) );
appendTo.add( new StringRefAddr( REFADDR_CLASSNAME, orig.getClassName() ) );
appendTo.add( new StringRefAddr( REFADDR_FACTORY, orig.getFactoryClassName() ) );
appendTo.add( new StringRefAddr( REFADDR_FACTORY_CLASS_LOCATION,
orig.getFactoryClassLocation() ) );
appendTo.add( new StringRefAddr( REFADDR_SIZE, String.valueOf(len) ) );
for (int i = 0; i < len; ++i)
appendTo.add( orig.get(i) );
}
/**
* @deprecated nesting references seemed useful until I realized that
* references are Serializable and can be stored in a BinaryRefAddr.
* Oops.
*/
public static ExtractRec extractNestedReference(Reference extractFrom, int index)
throws NamingException
{
try
{
int version = Integer.parseInt((String) extractFrom.get(index++).getContent());
if (version == 1)
{
String className = (String) extractFrom.get(index++).getContent();
String factoryClassName = (String) extractFrom.get(index++).getContent();
String factoryClassLocation = (String) extractFrom.get(index++).getContent();
Reference outRef = new Reference( className,
factoryClassName,
factoryClassLocation );
int size = Integer.parseInt((String) extractFrom.get(index++).getContent());
for (int i = 0; i < size; ++i)
outRef.add( extractFrom.get( index++ ) );
return new ExtractRec( outRef, index );
}
else
throw new NamingException("Bad version of nested reference!!!");
}
catch (NumberFormatException e)
{
if (Debug.DEBUG)
{
//e.printStackTrace();
if ( logger.isLoggable( MLevel.FINE ) )
logger.log( MLevel.FINE, "Version or size nested reference was not a number!!!", e);
}
throw new NamingException("Version or size nested reference was not a number!!!");
}
}
/**
* @deprecated nesting references seemed useful until I realized that
* references are Serializable and can be stored in a BinaryRefAddr.
* Oops.
*/
public static class ExtractRec
{
public Reference ref;
/**
* return the first RefAddr index that the function HAS NOT read to
* extract the reference.
*/
public int index;
private ExtractRec(Reference ref, int index)
{
this.ref = ref;
this.index = index;
}
}
private ReferenceableUtils()
{}
}
