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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2008 by Sun Microsystems, Inc.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: WeakBase.cs,v $
* $Revision: 1.5 $
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
using System;
using System.Collections;
using unoidl.com.sun.star.uno;
using unoidl.com.sun.star.lang;
namespace uno.util
{
/** This class can be used as a base class for UNO objects.
It implements the capability to be kept weakly
(unoidl.com.sun.star.uno.XWeak) and it implements
unoidl.com.sun.star.lang.XTypeProvider which is necessary for
using the object from StarBasic.
*/
public class WeakBase : XWeak, XTypeProvider
{
// Contains all WeakAdapter which have been created in this class
// They have to be notified when this object dies
private WeakAdapter m_adapter = null;
protected static Hashtable s_types = new Hashtable();
protected static Hashtable s_impl_ids = new Hashtable();
// XWeak impl
/** The returned XAdapter implementation can be used to keap a
weak reference to this object.
@return a weak adapter
*/
public XAdapter queryAdapter()
{
if (null == m_adapter)
{
lock (this)
{
if (null == m_adapter)
m_adapter = new WeakAdapter( this );
}
}
return m_adapter;
}
/** Overrides of Object.Finalize method.
When there are no references to this object anymore, then the
garbage collector calls this method, thereby causing the adapter
object to be notified. The adapter, in turn, notifies all
listeners (unoidl.com.sun.star.uno.XReference).
*/
~WeakBase()
{
if (null != m_adapter)
m_adapter.referentDying();
}
// XTypeProvider impl
/** Returns an array of Type objects which represent all implemented
UNO interfaces of this object.
@return Type objects of all implemented interfaces.
*/
public Type [] getTypes()
{
Type [] types;
Type type = GetType();
lock (s_types)
{
types = (Type []) s_types[ type ];
if (null == types)
{
Type [] interfaces = type.GetInterfaces();
ArrayList list = new ArrayList( interfaces.Length );
for ( Int32 pos = 0; pos < interfaces.Length; ++pos )
{
Type iface = interfaces[ pos ];
// xxx todo: as long as the bridge cannot introduce
// native CTS types into UNO on the fly
if (iface.FullName.StartsWith( "unoidl." ))
{
list.Add( iface );
}
}
Int32 len = list.Count;
Type [] ar = new Type [ len ];
for ( Int32 pos = 0; pos < len; ++pos )
ar[ pos ] = (Type) list[ pos ];
s_types[ type ] = ar;
types = ar;
}
}
return types;
}
/** Provides an identifier that represents the set of UNO interfaces
implemented by this class. All instances of this class which run
in the same CLR return the same array.
@return identifier as array of bytes
*/
public byte [] getImplementationId()
{
byte [] id;
Type type = GetType();
lock (s_impl_ids)
{
id = (byte []) s_impl_ids[ type ];
if (null == id)
{
Int32 hash = GetHashCode();
String name = type.FullName;
Int32 len= name.Length;
id = new byte[ 4 + (2 * len) ];
id[ 0 ]= (byte) (hash & 0xff);
id[ 1 ]= (byte) ((hash >> 8) & 0xff);
id[ 2 ]= (byte) ((hash >> 16) & 0xff);
id[ 3 ]= (byte) ((hash >> 24) & 0xff);
for ( Int32 pos = 0; pos < len; ++pos )
{
UInt16 c = Convert.ToUInt16( name[ pos ] );
id[ 4 + (2 * pos) ] = (byte) (c & 0xff);
id[ 4 + (2 * pos) +1 ] = (byte) ((c >> 8) & 0xff);
}
s_impl_ids[ type ] = id;
}
}
return id;
}
// System.Object
public override String ToString()
{
System.Text.StringBuilder buf =
new System.Text.StringBuilder( base.ToString(), 256 );
buf.Append( "\nUNO Object Implementation:\n\tImplementationId: " );
buf.Append( getImplementationId() );
buf.Append( "\n\tInterfaces: " );
Type [] types = getTypes();
for ( Int32 pos = 0; pos < types.Length; ++pos )
{
buf.Append( types[ pos ].FullName );
if (pos < (types.Length -1))
buf.Append( ", " );
}
return buf.ToString();
}
}
}
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