public class VFSClassLoader
extends java.security.SecureClassLoader
The search path can consist of VFS FileObjects referring both to folders and JAR files. Any FileObject of type FileType.FILE is assumed to be a JAR and is opened by creating a layered file system with the "jar" scheme.
TODO - Test this with signed Jars and a SecurityManager.
Modifier and Type | Field and Description |
---|---|
private java.util.ArrayList<FileObject> |
resources |
Constructor and Description |
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VFSClassLoader(FileObject[] files,
FileSystemManager manager)
Constructors a new VFSClassLoader for the given files.
|
VFSClassLoader(FileObject[] files,
FileSystemManager manager,
java.lang.ClassLoader parent)
Constructors a new VFSClassLoader for the given FileObjects.
|
VFSClassLoader(FileObject file,
FileSystemManager manager)
Constructors a new VFSClassLoader for the given file.
|
VFSClassLoader(FileObject file,
FileSystemManager manager,
java.lang.ClassLoader parent)
Constructors a new VFSClassLoader for the given file.
|
Modifier and Type | Method and Description |
---|---|
private void |
addFileObjects(FileSystemManager manager,
FileObject[] files)
Appends the specified FileObjects to the list of FileObjects to search
for classes and resources.
|
protected void |
copyPermissions(java.security.PermissionCollection src,
java.security.PermissionCollection dest)
Copies the permissions from src to dest.
|
private java.lang.Class<?> |
defineClass(java.lang.String name,
Resource res)
Loads and verifies the class with name and located with res.
|
private java.lang.Package |
definePackage(java.lang.String name,
Resource res)
Reads attributes for the package and defines it.
|
protected java.lang.Class<?> |
findClass(java.lang.String name)
Finds and loads the class with the specified name from the search
path.
|
protected java.net.URL |
findResource(java.lang.String name)
Finds the resource with the specified name from the search path.
|
protected java.util.Enumeration<java.net.URL> |
findResources(java.lang.String name)
Returns an Enumeration of all the resources in the search path
with the specified name.
|
FileObject[] |
getFileObjects()
Provide access to the file objects this class loader represents.
|
protected java.security.PermissionCollection |
getPermissions(java.security.CodeSource cs)
Calls super.getPermissions both for the code source and also
adds the permissions granted to the parent layers.
|
private boolean |
isSealed(Resource res)
Returns true if the we should seal the package where res resides.
|
private Resource |
loadResource(java.lang.String name)
Searches through the search path of for the first class or resource
with specified name.
|
private FileObject |
lookupFileObject(java.lang.String name)
Does a reverse lookup to find the FileObject when we only have the
URL.
|
clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findLibrary, findLoadedClass, findSystemClass, getClassLoadingLock, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, loadClass, registerAsParallelCapable, resolveClass, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners
private final java.util.ArrayList<FileObject> resources
public VFSClassLoader(FileObject file, FileSystemManager manager) throws FileSystemException
file
- the file to load the classes and resources from.manager
- the FileManager to use when trying create a layered Jar file
system.FileSystemException
- if an error occurs.public VFSClassLoader(FileObject file, FileSystemManager manager, java.lang.ClassLoader parent) throws FileSystemException
file
- the file to load the classes and resources from.manager
- the FileManager to use when trying create a layered Jar file
system.parent
- the parent class loader for delegation.FileSystemException
- if an error occurs.public VFSClassLoader(FileObject[] files, FileSystemManager manager) throws FileSystemException
files
- the files to load the classes and resources from.manager
- the FileManager to use when trying create a layered Jar file
system.FileSystemException
- if an error occurs.public VFSClassLoader(FileObject[] files, FileSystemManager manager, java.lang.ClassLoader parent) throws FileSystemException
files
- the FileObjects to load the classes and resources from.manager
- the FileManager to use when trying create a layered Jar file
system.parent
- the parent class loader for delegation.FileSystemException
- if an error occurs.public FileObject[] getFileObjects()
private void addFileObjects(FileSystemManager manager, FileObject[] files) throws FileSystemException
manager
- The FileSystemManager.files
- the FileObjects to append to the search path.FileSystemException
- if an error occurs.protected java.lang.Class<?> findClass(java.lang.String name) throws java.lang.ClassNotFoundException
findClass
in class java.lang.ClassLoader
java.lang.ClassNotFoundException
- if the class is not found.private java.lang.Class<?> defineClass(java.lang.String name, Resource res) throws java.io.IOException
java.io.IOException
private boolean isSealed(Resource res) throws FileSystemException
FileSystemException
private java.lang.Package definePackage(java.lang.String name, Resource res) throws FileSystemException
FileSystemException
protected java.security.PermissionCollection getPermissions(java.security.CodeSource cs)
getPermissions
in class java.security.SecureClassLoader
cs
- the CodeSource.protected void copyPermissions(java.security.PermissionCollection src, java.security.PermissionCollection dest)
src
- The source PermissionCollection.dest
- The destination PermissionCollection.private FileObject lookupFileObject(java.lang.String name)
protected java.net.URL findResource(java.lang.String name)
findResource
in class java.lang.ClassLoader
name
- The resource name.protected java.util.Enumeration<java.net.URL> findResources(java.lang.String name) throws java.io.IOException
Gets called from ClassLoader.getResources(String)
after
parent class loader was questioned.
findResources
in class java.lang.ClassLoader
name
- The resources to find.FileSystemException
- if an error occurs.java.io.IOException
private Resource loadResource(java.lang.String name) throws FileSystemException
name
- The resource to load.FileSystemException
- if an error occurs.