net.sf.jasperreports.engine.util.JRClassLoader Maven / Gradle / Ivy
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2014 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
* For every instance of this class,
* {@link ProtectionDomainFactory#getProtectionDomain(ClassLoader) getProtectionDomain} is called
* and the resulting protection domain is used when loading classes through the newly created
* classloader.
*
* @param protectionDomainFactory the protection domain factory.
* @see ProtectionDomainFactory#getProtectionDomain(ClassLoader)
*/
public static void setProtectionDomainFactory(ProtectionDomainFactory protectionDomainFactory)
{
JRClassLoader.protectionDomainFactory = protectionDomainFactory;
}
private ProtectionDomain protectionDomain;
/**
*
*/
protected JRClassLoader()
{
super();
}
/**
*
*/
protected JRClassLoader(ClassLoader parent)
{
super(parent);
}
/**
*
*/
public static Class loadClassForName(String className) throws ClassNotFoundException
{
Class clazz = null;
String classRealName = className;
ClassNotFoundException initialEx = null;
try
{
clazz = loadClassForRealName(classRealName);
}
catch (ClassNotFoundException e)
{
initialEx = e;
}
int lastDotIndex = 0;
while (clazz == null && (lastDotIndex = classRealName.lastIndexOf('.')) > 0)
{
classRealName =
classRealName.substring(0, lastDotIndex) + "$" + classRealName.substring(lastDotIndex + 1);
try
{
clazz = loadClassForRealName(classRealName);
}
catch (ClassNotFoundException e)
{
}
}
if (clazz == null)
{
throw initialEx;
}
return clazz;
}
/**
*
*/
public static Class loadClassForRealName(String className) throws ClassNotFoundException
{
Class clazz = null;
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader != null)
{
try
{
clazz = Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException e)
{
//if (log.isWarnEnabled())
// log.warn("Failure using Thread.currentThread().getContextClassLoader() in JRClassLoader class. Using JRClassLoader.class.getClassLoader() instead.");
}
}
if (clazz == null)
{
classLoader = JRClassLoader.class.getClassLoader();
if (classLoader == null)
{
clazz = Class.forName(className);
}
else
{
clazz = Class.forName(className, true, classLoader);
}
}
return clazz;
}
/**
*
*/
public static Class loadClassFromFile(String className, File file) throws IOException
{
Class clazz = null;
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader != null)
{
try
{
clazz =
(new JRClassLoader(classLoader))
.loadClass(className, file);
}
catch(NoClassDefFoundError e)
{
//if (log.isWarnEnabled())
// log.warn("Failure using Thread.currentThread().getContextClassLoader() in JRClassLoader class. Using JRClassLoader.class.getClassLoader() instead.");
}
}
if (clazz == null)
{
classLoader = JRClassLoader.class.getClassLoader();
if (classLoader == null)
{
clazz =
(new JRClassLoader())
.loadClass(className, file);
}
else
{
clazz =
(new JRClassLoader(classLoader))
.loadClass(className, file);
}
}
return clazz;
}
/**
*
*/
public static Class loadClassFromBytes(String className, byte[] bytecodes)
{
Class clazz = null;
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if (classLoader != null)
{
try
{
clazz =
(new JRClassLoader(classLoader))
.loadClass(className, bytecodes);
}
catch(NoClassDefFoundError e)
{
//if (log.isWarnEnabled())
// log.warn("Failure using Thread.currentThread().getContextClassLoader() in JRClassLoader class. Using JRClassLoader.class.getClassLoader() instead.");
}
}
if (clazz == null)
{
classLoader = JRClassLoader.class.getClassLoader();
if (classLoader == null)
{
clazz =
(new JRClassLoader())
.loadClass(className, bytecodes);
}
else
{
clazz =
(new JRClassLoader(classLoader))
.loadClass(className, bytecodes);
}
}
return clazz;
}
/**
*
*/
protected Class loadClass(String className, File file) throws IOException
{
FileInputStream fis = null;
ByteArrayOutputStream baos = null;
byte[] bytecodes = new byte[10000];
int ln = 0;
try
{
fis = new FileInputStream(file);
baos = new ByteArrayOutputStream();
while ( (ln = fis.read(bytecodes)) > 0 )
{
baos.write(bytecodes, 0, ln);
}
baos.flush();
}
finally
{
if (baos != null)
{
try
{
baos.close();
}
catch(IOException e)
{
}
}
if (fis != null)
{
try
{
fis.close();
}
catch(IOException e)
{
}
}
}
return loadClass(className, baos.toByteArray());
}
protected synchronized ProtectionDomain getProtectionDomain()
{
if (protectionDomain == null)
{
protectionDomain = getProtectionDomainFactory().getProtectionDomain(this);
}
return protectionDomain;
}
/**
*
*/
protected Class loadClass(String className, byte[] bytecodes)
{
Class clazz = null;
clazz =
defineClass(
className,
bytecodes,
0,
bytecodes.length,
getProtectionDomain()
);
return clazz;
}
/**
*
*/
public static String getClassRealName(String className)
{
if (className == null)
{
return null;
}
int arrayDimension = 0;
int classNameEnd = className.length();
int index = 0;
int pos = 0;
while (index < classNameEnd && (pos = className.indexOf('[', index)) >= 0)
{
if (index == 0)
{
classNameEnd = pos;
}
index = pos;
arrayDimension++;
}
if (arrayDimension > 0)
{
StringBuffer sbuffer = new StringBuffer();
for(int i = 0; i < arrayDimension; i++)
{
sbuffer.append('[');
}
sbuffer.append('L');
sbuffer.append(className.substring(0, classNameEnd));
sbuffer.append(';');
return sbuffer.toString();
}
return className;
}
}