File	Doc	Category	Size	Date	Package
Permission.java	API Doc	Java SE 5 API	7491	Fri Aug 26 14:57:14 BST 2005	java.security

Permission

• java.lang.Object

Fields Summary
private static final long	serialVersionUID
private String	name

Constructors Summary
public Permission(String name) Constructs a permission with the specified name. param name name of the Permission object being created. this.name = name;

Methods Summary
public void	checkGuard(java.lang.Object object) Implements the guard interface for a permission. The SecurityManager.checkPermission method is called, passing this permission object as the permission to check. Returns silently if access is granted. Otherwise, throws a SecurityException. param object the object being guarded (currently ignored). throws SecurityException if a security manager exists and its checkPermission method doesn't allow access. see Guard see GuardedObject see SecurityManager#checkPermission SecurityManager sm = System.getSecurityManager(); if (sm != null) sm.checkPermission(this);
public abstract boolean	equals(java.lang.Object obj) Checks two Permission objects for equality. Do not use the equals method for making access control decisions; use the implies method. param obj the object we are testing for equality with this object. return true if both Permission objects are equivalent.
public abstract java.lang.String	getActions() Returns the actions as a String. This is abstract so subclasses can defer creating a String representation until one is needed. Subclasses should always return actions in what they consider to be their canonical form. For example, two FilePermission objects created via the following: perm1 = new FilePermission(p1,"read,write"); perm2 = new FilePermission(p2,"write,read"); both return "read,write" when the getActions method is invoked. return the actions of this Permission.
public final java.lang.String	getName() Returns the name of this Permission. For example, in the case of a java.io.FilePermission, the name will be a pathname. return the name of this Permission. return name;
public abstract int	hashCode() Returns the hash code value for this Permission object. The required hashCode behavior for Permission Objects is the following: Whenever it is invoked on the same Permission object more than once during an execution of a Java application, the hashCode method must consistently return the same integer. This integer need not remain consistent from one execution of an application to another execution of the same application. If two Permission objects are equal according to the equals method, then calling the hashCode method on each of the two Permission objects must produce the same integer result. return a hash code value for this object.
public abstract boolean	implies(java.security.Permission permission) Checks if the specified permission's actions are "implied by" this object's actions. This must be implemented by subclasses of Permission, as they are the only ones that can impose semantics on a Permission object. The implies method is used by the AccessController to determine whether or not a requested permission is implied by another permission that is known to be valid in the current execution context. param permission the permission to check against. return true if the specified permission is implied by this object, false if not.
public java.security.PermissionCollection	newPermissionCollection() Returns an empty PermissionCollection for a given Permission object, or null if one is not defined. Subclasses of class Permission should override this if they need to store their permissions in a particular PermissionCollection object in order to provide the correct semantics when the PermissionCollection.implies method is called. If null is returned, then the caller of this method is free to store permissions of this type in any PermissionCollection they choose (one that uses a Hashtable, one that uses a Vector, etc). return a new PermissionCollection object for this type of Permission, or null if one is not defined. return null;
public java.lang.String	toString() Returns a string describing this Permission. The convention is to specify the class name, the permission name, and the actions in the following format: '("ClassName" "name" "actions")'. return information about this Permission. String actions = getActions(); if ((actions == null) || (actions.length() == 0)) { // OPTIONAL return "(" + getClass().getName() + " " + name + ")"; } else { return "(" + getClass().getName() + " " + name + " " + actions + ")"; }