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java.lang.Objectjava.lang.ClassLoader
java.security.SecureClassLoader
This class extends ClassLoader with additional support for defining classes with an associated code source and permissions which are retrieved by the system policy by default.
| Constructor Summary | |
protected |
SecureClassLoader()
Creates a new SecureClassLoader using the default parent class loader for delegation. |
protected |
SecureClassLoader(ClassLoader parent)
Creates a new SecureClassLoader using the specified parent class loader for delegation. |
| Method Summary | |
protected Class |
defineClass(String name,
byte[] b,
int off,
int len,
CodeSource cs)
Converts an array of bytes into an instance of class Class, with an optional CodeSource. |
protected PermissionCollection |
getPermissions(CodeSource codesource)
Returns the permissions for the given CodeSource object. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
protected SecureClassLoader(ClassLoader parent)
If there is a security manager, this method first
calls the security manager's checkCreateClassLoader
method to ensure creation of a class loader is allowed.
parent - the parent ClassLoader
SecurityException - if a security manager exists and its
checkCreateClassLoader method doesn't allow
creation of a class loader.SecurityManager.checkCreateClassLoader()protected SecureClassLoader()
If there is a security manager, this method first
calls the security manager's checkCreateClassLoader
method to ensure creation of a class loader is allowed.
SecurityException - if a security manager exists and its
checkCreateClassLoader method doesn't allow
creation of a class loader.SecurityManager.checkCreateClassLoader()| Method Detail |
protected final Class defineClass(String name,
byte[] b,
int off,
int len,
CodeSource cs)
If a non-null CodeSource is supplied a ProtectionDomain is constructed and associated with the class being defined.
name - the expected name of the class, or null
if not known, using '.' and not '/' as the separator
and without a trailing ".class" suffix.b - the bytes that make up the class data. The bytes in
positions off through off+len-1
should have the format of a valid class file as defined
by the
Java
Virtual Machine Specification.off - the start offset in b of the class datalen - the length of the class datacs - the associated CodeSource, or null if none
Class object created from the data,
and optional CodeSource.
ClassFormatError - if the data did not contain a valid class
IndexOutOfBoundsException - if either off or
len is negative, or if
off+len is greater than b.length.
SecurityException - if an attempt is made to add this class
to a package that contains classes that were signed by
a different set of certificates than this class, or if
the class name begins with "java.".protected PermissionCollection getPermissions(CodeSource codesource)
This method is invoked by the defineClass method which takes a CodeSource as an argument when it is constructing the ProtectionDomain for the class being defined.
codesource - the codesource.
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Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.