Class VFSClassLoader


  • 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.

    See Also:
    FileSystemManager.createFileSystem(java.lang.String, org.apache.commons.vfs2.FileObject)
    • 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.security.SecureClassLoader

        defineClass, defineClass
      • 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
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    • Constructor Detail

      • 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.
      • 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.
      • 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.
    • Method Detail

      • getFileObjects

        public FileObject[] getFileObjects()
        Provide access to the file objects this class loader represents.
        Returns:
        An array of FileObjects.
        Since:
        2.0
      • 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 class java.lang.ClassLoader
        Throws:
        java.lang.ClassNotFoundException - if the class is not found.
      • 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 class java.security.SecureClassLoader
        Parameters:
        cs - the CodeSource.
        Returns:
        The PermissionCollections.
      • 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.
      • 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 class java.lang.ClassLoader
        Parameters:
        name - The resource name.
        Returns:
        The URL that matches the resource.
      • 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 class java.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