net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream Maven / Gradle / Ivy
/*
* ============================================================================
* GNU Lesser General Public License
* ============================================================================
*
* JasperReports - Free Java report-generating library.
* Copyright (C) 2001-2009 JasperSoft Corporation http://www.jaspersoft.com
*
* This library 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 2.1 of the License, or (at your option) any later version.
*
* This library 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 library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
* JasperSoft Corporation
* 539 Bryant Street, Suite 100
* San Francisco, CA 94107
* http://www.jaspersoft.com
*/
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 ([email protected])
* @version $Id: ContextClassLoaderObjectInputStream.java 2697 2009-03-24 18:41:23Z 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 super.resolveClass() 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 super.resolveObject() and in case the object is
* a java.awt.Font, 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
{
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();
Font newFont = JRFontUtil.getAwtFontFromBundles(fontName, font.getStyle(), font.getSize(), null);
if (newFont != null)
{
return newFont; //FIXMEFONT this does not work in jdk1.4, where dialog font gets used unless we derive it using all attributes
//return newFont.deriveFont(font.getAttributes()); //this does not work in jdk1.6 where dialog gets used if we derive the font using attributes
}
}
return obj;
}
}