/*
Copyright (C) 2006, 2007, 2010 Jeroen Frijters
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
Jeroen Frijters
jeroen@frijters.net
*/
// HACK because of historical reasons this class' source lives in ikvm/internal instead of ikvm/runtime
package ikvm.runtime;
import cli.System.Reflection.Assembly;
import gnu.java.util.EmptyEnumeration;
import ikvm.lang.Internal;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Enumeration;
import java.util.Vector;
import java.util.jar.Attributes;
import java.util.jar.Manifest;
public final class AssemblyClassLoader extends ClassLoader
{
// NOTE assembly is null for "generics" class loader instances
private final Assembly assembly;
private boolean packagesDefined;
public AssemblyClassLoader(Assembly assembly)
{
super(null);
this.assembly = assembly;
}
protected Class loadClass(String name, boolean resolve) throws ClassNotFoundException
{
return LoadClass(this, assembly, name);
}
private static native Class LoadClass(ClassLoader classLoader, Assembly assembly, String name) throws ClassNotFoundException;
public URL getResource(String name)
{
// for consistency with class loading, we change the delegation order for .class files
if(name.endsWith(".class"))
{
URL url = getResource(this, assembly, name);
if(url != null)
{
return url;
}
}
return getResource(this, assembly, name);
}
public Enumeration getResources(String name) throws IOException
{
return getResources(this, assembly, name);
}
protected URL findResource(String name)
{
return getResource(this, assembly, name);
}
protected Enumeration findResources(String name) throws IOException
{
return getResources(this, assembly, name);
}
@Internal
public static URL makeIkvmresURL(Assembly asm, String name)
{
String assemblyName = asm.get_FullName();
try
{
return new URL("ikvmres", assemblyName, -1, "/" + name);
}
catch(MalformedURLException x)
{
throw (InternalError)new InternalError().initCause(x);
}
}
@Internal
public static URL getResource(ClassLoader classLoader, Assembly assembly, String name)
{
if(assembly != null)
{
Assembly[] asm = FindResourceAssemblies(assembly, name, true);
if(asm != null && asm.length > 0)
{
return makeIkvmresURL(asm[0], name);
}
}
return getClassResource(classLoader, assembly, name);
}
private static URL getClassResource(ClassLoader classLoader, Assembly assembly, String name)
{
if(name.endsWith(".class") && name.indexOf('.') == name.length() - 6)
{
Class c = null;
try
{
c = LoadClass(classLoader, assembly, name.substring(0, name.length() - 6).replace('/', '.'));
}
catch(ClassNotFoundException _)
{
}
catch(LinkageError _)
{
}
if(c != null && !IsDynamic(c))
{
assembly = GetAssemblyFromClass(c);
if(assembly != null)
{
return makeIkvmresURL(assembly, name);
}
else
{
// HACK we use an index to identity the generic class loader in the url
// TODO this obviously isn't persistable, we should use a list of assemblies instead.
try
{
return new URL("ikvmres", "gen", GetGenericClassLoaderId(c.getClassLoader()), "/" + name);
}
catch(MalformedURLException x)
{
throw (InternalError)new InternalError().initCause(x);
}
}
}
}
return null;
}
private static native Assembly[] FindResourceAssemblies(Assembly assembly, String name, boolean firstOnly);
private static native int GetGenericClassLoaderId(ClassLoader classLoader);
private static native String GetGenericClassLoaderName(Object classLoader);
private static native Assembly GetAssemblyFromClass(Class clazz);
private static native boolean IsDynamic(Class clazz);
// also used by VMClassLoader
@Internal
public static native String[] GetPackages(Assembly assembly);
@Internal
public static Enumeration getResources(ClassLoader classLoader, Assembly assembly, String name) throws IOException
{
Vector v = new Vector();
Assembly[] assemblies = FindResourceAssemblies(assembly, name, false);
if(assemblies != null)
{
for(int i = 0; i < assemblies.length; i++)
{
v.addElement(makeIkvmresURL(assemblies[i], name));
}
}
URL url = getClassResource(classLoader, assembly, name);
if(url != null)
{
v.addElement(url);
}
return v.elements();
}
private synchronized void lazyDefinePackagesCheck()
{
if(!packagesDefined)
{
packagesDefined = true;
lazyDefinePackages();
}
}
private static String getAttributeValue(Attributes.Name name, Attributes first, Attributes second)
{
String result = null;
if(first != null)
{
result = first.getValue(name);
}
if(second != null && result == null)
{
result = second.getValue(name);
}
return result;
}
private Manifest getManifest()
{
try
{
if(assembly != null)
{
return new Manifest(gnu.java.net.protocol.ikvmres.Handler.readResourceFromAssembly(assembly, "/META-INF/MANIFEST.MF"));
}
}
catch (MalformedURLException _)
{
}
catch (IOException _)
{
}
return null;
}
private void lazyDefinePackages()
{
if(assembly == null)
{
// generic class loader (doesn't support packages)
return;
}
URL sealBase = getCodeBase();
Manifest manifest = getManifest();
Attributes attr = null;
if(manifest != null)
{
attr = manifest.getMainAttributes();
}
String[] packages = GetPackages(assembly);
for(int i = 0; i < packages.length; i++)
{
String name = packages[i];
if(super.getPackage(name) == null)
{
Attributes entryAttr = null;
if(manifest != null)
{
entryAttr = manifest.getAttributes(name.replace('.', '/') + '/');
}
definePackage(name,
getAttributeValue(Attributes.Name.SPECIFICATION_TITLE, entryAttr, attr),
getAttributeValue(Attributes.Name.SPECIFICATION_VERSION, entryAttr, attr),
getAttributeValue(Attributes.Name.SPECIFICATION_VENDOR, entryAttr, attr),
getAttributeValue(Attributes.Name.IMPLEMENTATION_TITLE, entryAttr, attr),
getAttributeValue(Attributes.Name.IMPLEMENTATION_VERSION, entryAttr, attr),
getAttributeValue(Attributes.Name.IMPLEMENTATION_VENDOR, entryAttr, attr),
"true".equalsIgnoreCase(getAttributeValue(Attributes.Name.SEALED, entryAttr, attr)) ? sealBase : null);
}
}
}
protected Package getPackage(String name)
{
lazyDefinePackagesCheck();
return super.getPackage(name);
}
protected Package[] getPackages()
{
lazyDefinePackagesCheck();
return super.getPackages();
}
public String toString()
{
if(assembly != null)
{
return assembly.get_FullName();
}
return GetGenericClassLoaderName(this);
}
private URL getCodeBase()
{
try
{
if(assembly != null)
{
if(false) throw new cli.System.NotSupportedException();
return new URL(assembly.get_CodeBase());
}
}
catch(cli.System.NotSupportedException _)
{
}
catch(MalformedURLException _)
{
}
return null;
}
// return the ClassLoader for the assembly. Note that this doesn't have to be an AssemblyClassLoader.
public static native ClassLoader getAssemblyClassLoader(Assembly asm);
}