/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2009 Jaspersoft Corporation. All rights reserved.
* http://www.jaspersoft.com
*
* Unless you have purchased a commercial license agreement from Jaspersoft,
* the following license terms apply:
*
* This program is part of JasperReports.
*
* JasperReports is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JasperReports 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 JasperReports. If not, see <http://www.gnu.org/licenses/>.
*/
package net.sf.jasperreports.engine.util;
import java.awt.Font;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;
/**
* A subclass of {@link ObjectInputStream} that uses
* {@link Thread#getContextClassLoader() the context class loader} to resolve
* classes encountered in the input stream.
*
* @author Lucian Chirita (lucianc@users.sourceforge.net)
* @version $Id: ContextClassLoaderObjectInputStream.java 3807 2010-05-19 09:37:17Z teodord $
*/
public class ContextClassLoaderObjectInputStream extends ObjectInputStream
{
/**
* Creates an object input stream that reads data from the specified
* {@link InputStream}.
*
* @param in the input stream to read data from
* @throws IOException
* @see ObjectInputStream#ObjectInputStream(InputStream)
*/
public ContextClassLoaderObjectInputStream(InputStream in) throws IOException
{
super(in);
try
{
enableResolveObject(true);
}
catch(SecurityException ex)
{
//FIXMEFONT we silence this for applets. but are there other similar situations that we need to deal with by signing jars?
}
}
/**
* Calls <code>super.resolveClass()</code> and in case this fails with
* {@link ClassNotFoundException} attempts to load the class using the
* context class loader.
*/
protected Class resolveClass(ObjectStreamClass desc) throws IOException,
ClassNotFoundException
{
try
{
return super.resolveClass(desc);
}
catch (ClassNotFoundException e)
{
ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
if (contextClassLoader == null)
{
throw e;
}
String name = desc.getName();
try
{
//attempt to load the class using the context class loader
return Class.forName(name, false, contextClassLoader);
}
catch (ClassNotFoundException e2)
{
//fallback to the original exception
throw e;
}
}
}
/**
* Calls <code>super.resolveObject()</code> and in case the object is
* a <code>java.awt.Font</code>, it look up for it is fails with
* {@link ClassNotFoundException} attempts to load the class using the
* context class loader.
*/
protected Object resolveObject(Object obj) throws IOException//FIXMENOW fix the javadoc comment
{
Font font = (obj instanceof Font) ? (Font)obj : null;
if (font != null)
{
//String fontName = (String)font.getAttributes().get(TextAttribute.FAMILY);//FIXMEFONT check this
String fontName = font.getName();
// We load an instance of an AWT font, even if the specified fontName is not available (ignoreMissingFont=true),
// because only third-party visualization packages such as JFreeChart (chart themes) store serialized java.awt.Font objects,
// and they are responsible for the drawing as well.
Font newFont = JRFontUtil.getAwtFontFromBundles(fontName, font.getStyle(), font.getSize(), null, true);
if (newFont != null)
{
return newFont.deriveFont(font.getAttributes());
}
}
return obj;
}
}