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Free Java Reporting Library
/*
* JasperReports - Free Java Reporting Library.
* Copyright (C) 2001 - 2023 Cloud Software Group, 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.compilers;
import java.lang.reflect.InvocationTargetException;
import java.security.ProtectionDomain;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mozilla.javascript.DefiningClassLoader;
import org.mozilla.javascript.Script;
import org.mozilla.javascript.optimizer.Codegen;
import net.sf.jasperreports.compilers.JavaScriptCompiledData.CompiledClass;
import net.sf.jasperreports.engine.JRRuntimeException;
import net.sf.jasperreports.engine.util.JRClassLoader;
import net.sf.jasperreports.engine.util.ProtectionDomainFactory;
/**
* Class loader used to load classes generated for JavaScript expression evaluation.
*
* @author Lucian Chirita ([email protected])
* @see JavaScriptCompiledEvaluator
*/
public class JavaScriptClassLoader extends DefiningClassLoader
{
private static final Log log = LogFactory.getLog(JavaScriptClassLoader.class);
public static final String EXCEPTION_MESSAGE_KEY_INSTANCE_ERROR = "compilers.javascript.instance.error";
public static final String EXCEPTION_MESSAGE_KEY_LOAD_ERROR = "compilers.javascript.load.error";
private volatile ProtectionDomain protectionDomain;
public JavaScriptClassLoader()
{
super(Codegen.class.getClassLoader());
}
public Script createScript(int classIndex, JavaScriptCompiledData compiledData)
{
CompiledClass compiledClass = compiledData.getCompiledClass(classIndex);
Class scriptClass = loadExpressionClass(compiledClass);
try
{
Script script = scriptClass.getDeclaredConstructor().newInstance();
return script;
}
catch (InstantiationException | IllegalAccessException
| NoSuchMethodException | InvocationTargetException e)
{
throw
new JRRuntimeException(
EXCEPTION_MESSAGE_KEY_INSTANCE_ERROR,
new Object[]{compiledClass.getClassName()},
e);
}
}
protected synchronized Class loadExpressionClass(CompiledClass compiledClass)
{
String className = compiledClass.getClassName();
// first check if the class is already loaded
Class scriptClass = findLoadedClass(className);
if (scriptClass == null)
{
if (log.isDebugEnabled())
{
log.debug("loading script class " + className);
}
try
{
ProtectionDomain domain = getProtectionDomain();
byte[] classBytes = compiledClass.getClassBytes();
scriptClass = defineClass(className, classBytes, 0, classBytes.length, domain);
linkClass(scriptClass);
}
catch (SecurityException | IllegalArgumentException e)
{
throw
new JRRuntimeException(
EXCEPTION_MESSAGE_KEY_LOAD_ERROR,
new Object[]{className},
e);
}
}
return (Class) scriptClass;
}
protected ProtectionDomain getProtectionDomain()
{
ProtectionDomain domain = protectionDomain;
if (domain == null)
{
synchronized (this)
{
domain = protectionDomain;
if (domain == null)
{
ProtectionDomainFactory protectionDomainFactory = JRClassLoader.getProtectionDomainFactory();
domain = protectionDomain = protectionDomainFactory.getProtectionDomain(this);
}
}
}
return domain;
}
@Override
public String toString()
{
return getClass().getSimpleName() + '@' + hashCode();
}
@Override
protected void finalize() throws Throwable
{
super.finalize();
if (log.isDebugEnabled())
{
log.debug("finalized " + this);
}
}
}