PermissionCollection

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java.security
Class PermissionCollection

java.lang.Object
  java.security.PermissionCollection

All Implemented Interfaces:: java.io.Serializable

Direct Known Subclasses:: AllPermission.AllPermissionCollection, BasicPermission.BasicPermissionCollection, Permissions, Permissions.PermissionsHash, UnresolvedPermissionCollection

public abstract class PermissionCollection
extends java.lang.Object
implements java.io.Serializable

This class models a group of Java permissions. It has convenient methods for determining whether or not a given permission is implied by any of the permissions in this collection.

Some care must be taken in storing permissions. First, a collection of the appropriate type must be created. This is done by calling the newPermissionCollection method on an object of the permission class you wish to add to the collection. If this method returns null, any type of PermissionCollection can be used to store permissions of that type. However, if a PermissionCollection collection object is returned, that type must be used.

A PermissionCollection returned by the newPermissionCollection method in a subclass of Permission is a homogeneous collection. It only will hold permissions of one specified type - instances of the class that created it. Not all PermissionCollection subclasses have to hold permissions of only one type however. For example, the Permissions class holds permissions of many types.

Since the newPermissionCollection in Permission itself returns null, by default a permission can be stored in any type of collection unless it overrides that method to create its own collection type.

Since:: 1.1

Field Summary

private boolean readOnly
          Indicates whether or not this collection is read only.

private static long serialVersionUID
          Compatible with JDK 1.1+.

Constructor Summary

PermissionCollection()
          Create a new collection.

Method Summary

abstract void add(Permission perm)
          This method adds a new Permission object to the collection.

abstract java.util.Enumeration elements()
          This method returns an Enumeration of all the objects in this collection.

abstract boolean implies(Permission perm)
          This method tests whether the specified Permission object is implied by this collection of Permission objects.

boolean isReadOnly()
          This method tests whether or not this PermissionCollection object is read only.

void setReadOnly()
          This method sets this PermissionCollection object to be read only.

java.lang.String toString()
          This method returns a String representation of this collection.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

Compatible with JDK 1.1+.

See Also:: Constant Field Values

readOnly

private boolean readOnly

Indicates whether or not this collection is read only.

Constructor Detail