net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jasperreports Show documentation
Show all versions of jasperreports Show documentation
Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2022 TIBCO Software Inc. 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 .
*/
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;
import net.sf.jasperreports.engine.JasperReportsContext;
import net.sf.jasperreports.engine.fonts.FontUtil;
/**
* 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])
*/
public class ContextClassLoaderObjectInputStream extends ObjectInputStream
{
private final JasperReportsContext jasperReportsContext;
/**
* 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(JasperReportsContext jasperReportsContext, InputStream in) throws IOException
{
super(in);
this.jasperReportsContext = jasperReportsContext;
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?
}
}
/**
*
*/
public JasperReportsContext getJasperReportsContext()
{
return jasperReportsContext;
}
/**
* Calls super.resolveClass()
and in case this fails with
* {@link ClassNotFoundException} attempts to load the class using the
* context class loader.
*/
@Override
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;
}
}
}
/**
* Checks to see if the object is an instance of java.awt.Font
,
* and in case it is, it replaces it with the one looked up for in the font extensions.
*/
@Override
protected Object resolveObject(Object obj) throws IOException
{
Font font = (obj instanceof Font) ? (Font)obj : null;
if (font != null)
{
return FontUtil.getInstance(jasperReportsContext).resolveDeserializedFont(font);
}
return obj;
}
}