home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Programming Languages Suite
/
ProgLangD.iso
/
VCAFE.3.0A
/
Main.bin
/
IdentityScope.java
< prev
next >
Wrap
Text File
|
1998-09-22
|
7KB
|
217 lines
/*
* @(#)IdentityScope.java 1.34 98/07/01
*
* Copyright 1995-1998 by Sun Microsystems, Inc.,
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information
* of Sun Microsystems, Inc. ("Confidential Information"). You
* shall not disclose such Confidential Information and shall use
* it only in accordance with the terms of the license agreement
* you entered into with Sun.
*/
package java.security;
import java.io.Serializable;
import java.util.Enumeration;
import java.util.Properties;
/**
* <p>This class represents a scope for identities. It is an Identity
* itself, and therefore has a name and can have a scope. It can also
* optionally have a public key and associated certificates.
*
* <p>An IdentityScope can contain Identity objects of all kinds, including
* Signers. All types of Identity objects can be retrieved, added, and
* removed using the same methods. Note that it is possible, and in fact
* expected, that different types of identity scopes will
* apply different policies for their various operations on the
* various types of Identities.
*
* <p>There is a one-to-one mapping between keys and identities, and
* there can only be one copy of one key per scope. For example, suppose
* <b>Acme Software, Inc</b> is a software publisher known to a user.
* Suppose it is an Identity, that is, it has a public key, and a set of
* associated certificates. It is named in the scope using the name
* "Acme Software". No other named Identity in the scope has the same
* public key. Of course, none has the same name as well.
*
* @see Identity
* @see Signer
* @see Principal
* @see Key
*
* @version 1.31, 01/27/97
* @author Benjamin Renaud */
public abstract
class IdentityScope extends Identity {
/* The system's scope */
private static IdentityScope scope;
// initialize the system scope
private static void initializeSystemScope() {
String classname = Security.getProperty("system.scope");
if (classname == null) {
return;
} else {
try {
Class.forName(classname);
} catch (ClassNotFoundException e) {
Security.error("unable to establish a system scope from " +
classname);
e.printStackTrace();
}
}
}
/**
* This constructor is used for serialization only and should not
* be used by subclasses.
*/
protected IdentityScope() {
this("restoring...");
}
/**
* Constructs a new identity scope with the specified name.
*
* @param name the scope name.
*/
public IdentityScope(String name) {
super(name);
}
/**
* Constructs a new identity scope with the specified name and scope.
*
* @param name the scope name.
* @param scope the scope for the new identity scope.
*
* @exception KeyManagementException if there is already an identity
* with the same name in the scope.
*/
public IdentityScope(String name, IdentityScope scope)
throws KeyManagementException {
super(name, scope);
}
/**
* Returns the system's identity scope. See the
* "System Identity Scope" section in the <a href=
* "../guide/security/CryptoSpec.html#SysIdScope">
* Java Cryptography Architecture API Specification & Reference </a>.
*
* @return the system's identity scope.
*/
public static IdentityScope getSystemScope() {
if (scope == null) {
initializeSystemScope();
}
return scope;
}
/**
* Sets the system's identity scope. See the
* "System Identity Scope" section in the <a href=
* "../guide/security/CryptoSpec.html#SysIdScope">
* Java Cryptography Architecture API Specification & Reference </a>.
*
* @param scope the scope to set.
*/
protected static void setSystemScope(IdentityScope scope) {
staticCheck("set.system.scope");
IdentityScope.scope = scope;
}
/**
* Returns the number of identities within this identity scope.
*
* @return the number of identities within this identity scope.
*/
public abstract int size();
/**
* Returns the identity in this scope with the specified name (if any).
*
* @param name the name of the identity to be retrieved.
*
* @return the identity named <code>name</code>, or null if there are
* no identities named <code>name</code> in this scope.
*/
public abstract Identity getIdentity(String name);
/**
* Retrieves the identity whose name is the same as that of the
* specified principal. (Note: Identity implements Principal.)
*
* @param principal the principal corresponding to the identity
* to be retrieved.
*
* @return the identity whose name is the same as that of the
* principal, or null if there are no identities of the same name
* in this scope.
*/
public Identity getIdentity(Principal principal) {
return getIdentity(principal.getName());
}
/**
* Retrieves the identity with the specified public key.
*
* @param key the public key for the identity to be returned.
*
* @return the identity with the given key, or null if there are
* no identities in this scope with that key.
*/
public abstract Identity getIdentity(PublicKey key);
/**
* Adds an identity to this identity scope.
*
* @param identity the identity to be added.
*
* @exception KeyManagementException if the identity is not
* valid, a name conflict occurs, another identity has the same
* public key as the identity being added, or another exception
* occurs. */
public abstract void addIdentity(Identity identity)
throws KeyManagementException;
/**
* Removes an identity from this identity scope.
*
* @param identity the identity to be removed.
*
* @exception KeyManagementException if the identity is missing,
* or another exception occurs.
*/
public abstract void removeIdentity(Identity identity)
throws KeyManagementException;
/**
* Returns an enumeration of all identities in this identity scope.
*
* @return an enumeration of all identities in this identity scope.
*/
public abstract Enumeration identities();
/**
* Returns a string representation of this identity scope, including
* its name, its scope name, and the number of identities in this
* identity scope.
*
* @return a string representation of this identity scope.
*/
public String toString() {
return super.toString() + "[" + size() + "]";
}
}