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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
package com.sun.star.lib.uno.helper;
import com.sun.star.uno.XWeak;
import com.sun.star.uno.XAdapter;
import com.sun.star.lang.XTypeProvider;
import com.sun.star.uno.Type;
import java.util.Vector;
import java.util.Map;
import java.util.Hashtable;
/** This class can be used as the base class for UNO components. It implements the capability
* to be kept weak (com.sun.star.uno.XWeak) and it implements com.sun.star.lang.XTypeProvider
* which is necessary for using the component with StarBasic.
*/
public class WeakBase implements XWeak, XTypeProvider
{
private final boolean DEBUG= false;
// Contains all WeakAdapter which have been created in this class
// They have to be notified when this object dies
private WeakAdapter m_adapter;
protected static Map _mapImplementationIds= new Hashtable();
protected static Map _mapTypes= new Hashtable();
/** Method of XWeak. The returned XAdapter implementation can be used to keap
* a weak reference to this object.
* @return a com.sun.star.uno.XAdapter implementation.
*/
synchronized public XAdapter queryAdapter()
{
if (m_adapter == null)
m_adapter= new WeakAdapter(this);
return m_adapter;
}
/** Override of Object.finalize. 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 (com.sun.star.uno.XReference)
*/
protected void finalize() throws java.lang.Throwable
{
if (m_adapter != null)
m_adapter.referentDying();
super.finalize();
}
/** Method of XTypeProvider. It 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[] arTypes= (Type[]) _mapTypes.get( getClass());
if (arTypes == null)
{
Vector vec= new Vector();
Class currentClass= getClass();
do
{
Class interfaces[]= currentClass.getInterfaces();
for(int i = 0; i < interfaces.length; ++ i)
{
// Test if it is a UNO interface
if (com.sun.star.uno.XInterface.class.isAssignableFrom((interfaces[i])))
vec.add(new Type(interfaces[i]));
}
// get the superclass the currentClass inherits from
currentClass= currentClass.getSuperclass();
} while (currentClass != null);
Type types[]= new Type[vec.size()];
for( int i= 0; i < types.length; i++)
types[i]= (Type) vec.elementAt(i);
_mapTypes.put(getClass(), types);
arTypes= types;
}
return arTypes;
}
/** Method of XTypeProvider. It provides an identifier that represents the set of UNO
* interfaces implemented by this class. All instances of this class
* which run in the same Java Virtual Machine return the same array. (This only works as long
* the ClassLoader preserves the class even if no instance exist.)
*@return identifier as array of bytes
*/
public byte[] getImplementationId()
{
byte[] id= null;
synchronized (_mapImplementationIds)
{
id= (byte[]) _mapImplementationIds.get(getClass());
if (id == null)
{
int hash = hashCode();
String sName= getClass().getName();
byte[] arName= sName.getBytes();
int nNameLength= arName.length;
id= new byte[ 4 + nNameLength];
id[0]= (byte)(hash & 0xff);
id[1]= (byte)((hash >>> 8) & 0xff);
id[2]= (byte)((hash >>> 16) & 0xff);
id[3]= (byte)((hash >>>24) & 0xff);
for (int i= 0; i < nNameLength; i++)
{
id[4 + i]= arName[i];
}
_mapImplementationIds.put(getClass(), id);
}
}
return id;
}
}
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