com.mchange.v2.naming.JavaBeanReferenceMaker Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.naming;
import java.beans.*;
import java.io.*;
import java.util.*;
import javax.naming.*;
import com.mchange.v2.log.*;
import java.lang.reflect.Method;
import com.mchange.v2.lang.Coerce;
import com.mchange.v2.beans.BeansUtils;
import com.mchange.v2.ser.SerializableUtils;
import com.mchange.v2.ser.IndirectPolicy;
public class JavaBeanReferenceMaker implements ReferenceMaker
{
private final static MLogger logger = MLog.getLogger( JavaBeanReferenceMaker.class );
final static String REF_PROPS_KEY = "com.mchange.v2.naming.JavaBeanReferenceMaker.REF_PROPS_KEY";
final static Object[] EMPTY_ARGS = new Object[0];
final static byte[] NULL_TOKEN_BYTES = new byte[0];
String factoryClassName = "com.mchange.v2.naming.JavaBeanObjectFactory";
String defaultFactoryClassLocation = null;
Set referenceProperties = new HashSet();
ReferenceIndirector indirector = new ReferenceIndirector();
public Hashtable getEnvironmentProperties()
{ return indirector.getEnvironmentProperties(); }
public void setEnvironmentProperties( Hashtable environmentProperties )
{ indirector.setEnvironmentProperties( environmentProperties ); }
public void setFactoryClassName(String factoryClassName)
{ this.factoryClassName = factoryClassName; }
public String getFactoryClassName()
{ return factoryClassName; }
public String getDefaultFactoryClassLocation()
{ return defaultFactoryClassLocation; }
public void setDefaultFactoryClassLocation( String defaultFactoryClassLocation )
{ this.defaultFactoryClassLocation = defaultFactoryClassLocation; }
public void addReferenceProperty( String propName )
{ referenceProperties.add( propName ); }
public void removeReferenceProperty( String propName )
{ referenceProperties.remove( propName ); }
public Reference createReference( Object bean )
throws NamingException
{
try
{
BeanInfo bi = Introspector.getBeanInfo( bean.getClass() );
PropertyDescriptor[] pds = bi.getPropertyDescriptors();
List refAddrs = new ArrayList();
String factoryClassLocation = defaultFactoryClassLocation;
boolean using_ref_props = referenceProperties.size() > 0;
// we only include this so that on dereference we are not surprised to find some properties missing
if (using_ref_props)
refAddrs.add( new BinaryRefAddr( REF_PROPS_KEY, SerializableUtils.toByteArray( referenceProperties ) ) );
for (int i = 0, len = pds.length; i < len; ++i)
{
PropertyDescriptor pd = pds[i];
String propertyName = pd.getName();
//System.err.println("Making Reference: " + propertyName);
if (using_ref_props && ! referenceProperties.contains( propertyName ))
{
//System.err.println("Not a ref_prop -- continuing.");
continue;
}
Class propertyType = pd.getPropertyType();
Method getter = pd.getReadMethod();
Method setter = pd.getWriteMethod();
if (getter != null && setter != null) //only use properties that are both readable and writable
{
Object val = getter.invoke( bean, EMPTY_ARGS );
//System.err.println( "val: " + val );
if (propertyName.equals("factoryClassLocation"))
{
if (String.class != propertyType)
throw new NamingException(this.getClass().getName() + " requires a factoryClassLocation property to be a string, " +
propertyType.getName() + " is not valid.");
factoryClassLocation = (String) val;
}
if (val == null)
{
RefAddr addMe = new BinaryRefAddr( propertyName, NULL_TOKEN_BYTES );
refAddrs.add( addMe );
}
else if ( Coerce.canCoerce( propertyType ) )
{
RefAddr addMe = new StringRefAddr( propertyName, String.valueOf( val ) );
refAddrs.add( addMe );
}
else //other Object properties
{
RefAddr addMe = null;
PropertyEditor pe = BeansUtils.findPropertyEditor( pd );
if (pe != null)
{
pe.setValue( val );
String textValue = pe.getAsText();
if (textValue != null)
addMe = new StringRefAddr( propertyName, textValue );
}
if (addMe == null) //property editor approach failed
addMe = new BinaryRefAddr( propertyName, SerializableUtils.toByteArray( val,
indirector,
IndirectPolicy.INDIRECT_ON_EXCEPTION ) );
refAddrs.add( addMe );
}
}
else
{
// System.err.println(this.getClass().getName() +
// ": Skipping " + propertyName + " because it is " + (setter == null ? "read-only." : "write-only."));
if ( logger.isLoggable( MLevel.WARNING ) )
logger.warning(this.getClass().getName() + ": Skipping " + propertyName +
" because it is " + (setter == null ? "read-only." : "write-only."));
}
}
Reference out = new Reference( bean.getClass().getName(), factoryClassName, factoryClassLocation );
for (Iterator ii = refAddrs.iterator(); ii.hasNext(); )
out.add( (RefAddr) ii.next() );
return out;
}
catch ( Exception e )
{
//e.printStackTrace();
if ( Debug.DEBUG && logger.isLoggable( MLevel.FINE ) )
logger.log( MLevel.FINE, "Exception trying to create Reference.", e);
throw new NamingException("Could not create reference from bean: " + e.toString() );
}
}
}