SecureClassLoader (Java 2 Platform SE 5.0) (original) (raw)
java.security
Class SecureClassLoader
java.lang.Object
java.lang.ClassLoader
java.security.SecureClassLoader
Direct Known Subclasses:
public class SecureClassLoader
extends ClassLoader
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](../../java/security/SecureClassLoader.html#defineClass%28java.lang.String, byte[], int, int, java.security.CodeSource%29)(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 Class<?> | [defineClass](../../java/security/SecureClassLoader.html#defineClass%28java.lang.String, java.nio.ByteBuffer, java.security.CodeSource%29)(String name,ByteBuffer b,CodeSource cs) Converts a ByteBuffer 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.ClassLoader |
|---|
| clearAssertionStatus, [defineClass](../../java/lang/ClassLoader.html#defineClass%28byte[], int, int%29), [defineClass](../../java/lang/ClassLoader.html#defineClass%28java.lang.String, byte[], int, int%29), [defineClass](../../java/lang/ClassLoader.html#defineClass%28java.lang.String, byte[], int, int, java.security.ProtectionDomain%29), [defineClass](../../java/lang/ClassLoader.html#defineClass%28java.lang.String, java.nio.ByteBuffer, java.security.ProtectionDomain%29), [definePackage](../../java/lang/ClassLoader.html#definePackage%28java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.net.URL%29), findClass, findLibrary, findLoadedClass, findResource, findResources, findSystemClass, getPackage, getPackages, getParent, getResource, getResourceAsStream, getResources, getSystemClassLoader, getSystemResource, getSystemResourceAsStream, getSystemResources, loadClass, [loadClass](../../java/lang/ClassLoader.html#loadClass%28java.lang.String, boolean%29), resolveClass, [setClassAssertionStatus](../../java/lang/ClassLoader.html#setClassAssertionStatus%28java.lang.String, boolean%29), setDefaultAssertionStatus, [setPackageAssertionStatus](../../java/lang/ClassLoader.html#setPackageAssertionStatus%28java.lang.String, boolean%29), [setSigners](../../java/lang/ClassLoader.html#setSigners%28java.lang.Class, java.lang.Object[]%29) |
| Methods inherited from class java.lang.Object |
|---|
| clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, [wait](../../java/lang/Object.html#wait%28long, int%29) |
| Constructor Detail |
|---|
SecureClassLoader
protected SecureClassLoader(ClassLoader parent)
Creates a new SecureClassLoader using the specified parent class loader for delegation.
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.
Parameters:
parent - the parent ClassLoader
Throws:
[SecurityException](../../java/lang/SecurityException.html "class in java.lang") - if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
See Also:
SecurityManager.checkCreateClassLoader()
SecureClassLoader
protected SecureClassLoader()
Creates a new SecureClassLoader using the default parent class loader for delegation.
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.
Throws:
[SecurityException](../../java/lang/SecurityException.html "class in java.lang") - if a security manager exists and its checkCreateClassLoader method doesn't allow creation of a class loader.
See Also:
SecurityManager.checkCreateClassLoader()
| Method Detail |
|---|
defineClass
protected final 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. Before the class can be used it must be resolved.
If a non-null CodeSource is supplied a ProtectionDomain is constructed and associated with the class being defined.
Parameters:
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 data
len - the length of the class data
cs - the associated CodeSource, or null if none
Returns:
the Class object created from the data, and optional CodeSource.
Throws:
[ClassFormatError](../../java/lang/ClassFormatError.html "class in java.lang") - if the data did not contain a valid class
[IndexOutOfBoundsException](../../java/lang/IndexOutOfBoundsException.html "class in java.lang") - if either off or len is negative, or if off+len is greater than b.length.
[SecurityException](../../java/lang/SecurityException.html "class in java.lang") - 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.".
defineClass
protected final Class<?> defineClass(String name, ByteBuffer b, CodeSource cs)
Converts a ByteBuffer into an instance of class Class, with an optional CodeSource. Before the class can be used it must be resolved.
If a non-null CodeSource is supplied a ProtectionDomain is constructed and associated with the class being defined.
Parameters:
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 from positionsb.position() through b.position() + b.limit() -1 should have the format of a valid class file as defined by theJava Virtual Machine Specification.
cs - the associated CodeSource, or null if none
Returns:
the Class object created from the data, and optional CodeSource.
Throws:
[ClassFormatError](../../java/lang/ClassFormatError.html "class in java.lang") - if the data did not contain a valid class
[SecurityException](../../java/lang/SecurityException.html "class in java.lang") - 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.".
Since:
1.5
getPermissions
protected PermissionCollection getPermissions(CodeSource codesource)
Returns the permissions for the given CodeSource object.
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.
Parameters:
codesource - the codesource.
Returns:
the permissions granted to the codesource.
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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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