Package org.apache.commons.vfs2.impl
Class VFSClassLoader
- java.lang.Object
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- java.lang.ClassLoader
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- java.security.SecureClassLoader
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- org.apache.commons.vfs2.impl.VFSClassLoader
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public class VFSClassLoader extends java.security.SecureClassLoader
A class loader that can load classes and resources from a search path.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.
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Constructor Summary
Constructors Constructor Description 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.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected void
copyPermissions(java.security.PermissionCollection src, java.security.PermissionCollection dest)
Copies the permissions from src to dest.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.-
Methods inherited from class java.lang.ClassLoader
clearAssertionStatus, defineClass, defineClass, defineClass, defineClass, definePackage, findClass, findLibrary, findLoadedClass, findResource, findSystemClass, getClassLoadingLock, getDefinedPackage, getDefinedPackages, getName, getPackage, getPackages, getParent, getPlatformClassLoader, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, getUnnamedModule, isRegisteredAsParallelCapable, loadClass, loadClass, registerAsParallelCapable, resolveClass, resources, setClassAssertionStatus, setDefaultAssertionStatus, setPackageAssertionStatus, setSigners
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Constructor Detail
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VFSClassLoader
public VFSClassLoader(FileObject file, FileSystemManager manager) throws FileSystemException
Constructors a new VFSClassLoader for the given file.- Parameters:
file
- the file to load the classes and resources from.manager
- the FileManager to use when trying create a layered Jar file system.- Throws:
FileSystemException
- if an error occurs.
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VFSClassLoader
public VFSClassLoader(FileObject file, FileSystemManager manager, java.lang.ClassLoader parent) throws FileSystemException
Constructors a new VFSClassLoader for the given file.- Parameters:
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.- Throws:
FileSystemException
- if an error occurs.
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VFSClassLoader
public VFSClassLoader(FileObject[] files, FileSystemManager manager) throws FileSystemException
Constructors a new VFSClassLoader for the given files. The files will be searched in the order specified.- Parameters:
files
- the files to load the classes and resources from.manager
- the FileManager to use when trying create a layered Jar file system.- Throws:
FileSystemException
- if an error occurs.
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VFSClassLoader
public VFSClassLoader(FileObject[] files, FileSystemManager manager, java.lang.ClassLoader parent) throws FileSystemException
Constructors a new VFSClassLoader for the given FileObjects. The FileObjects will be searched in the order specified.- Parameters:
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.- Throws:
FileSystemException
- if an error occurs.
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Method Detail
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getFileObjects
public FileObject[] getFileObjects()
Provide access to the file objects this class loader represents.- Returns:
- An array of FileObjects.
- Since:
- 2.0
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findClass
protected java.lang.Class<?> findClass(java.lang.String name) throws java.lang.ClassNotFoundException
Finds and loads the class with the specified name from the search path.- Overrides:
findClass
in classjava.lang.ClassLoader
- Throws:
java.lang.ClassNotFoundException
- if the class is not found.
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getPermissions
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.- Overrides:
getPermissions
in classjava.security.SecureClassLoader
- Parameters:
cs
- the CodeSource.- Returns:
- The PermissionCollections.
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copyPermissions
protected void copyPermissions(java.security.PermissionCollection src, java.security.PermissionCollection dest)
Copies the permissions from src to dest.- Parameters:
src
- The source PermissionCollection.dest
- The destination PermissionCollection.
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findResource
protected java.net.URL findResource(java.lang.String name)
Finds the resource with the specified name from the search path. This returns null if the resource is not found.- Overrides:
findResource
in classjava.lang.ClassLoader
- Parameters:
name
- The resource name.- Returns:
- The URL that matches the resource.
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findResources
protected java.util.Enumeration<java.net.URL> findResources(java.lang.String name) throws java.io.IOException
Returns an Enumeration of all the resources in the search path with the specified name.Gets called from
ClassLoader.getResources(String)
after parent class loader was questioned.- Overrides:
findResources
in classjava.lang.ClassLoader
- Parameters:
name
- The resources to find.- Returns:
- An Enumeration of the resources associated with the name.
- Throws:
FileSystemException
- if an error occurs.java.io.IOException
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