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Showing content from https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/security/Permissions.html below:

Permissions (Java SE 21 & JDK 21)

All Implemented Interfaces:

Serializable

This class represents a heterogeneous collection of permissions. That is, it contains different types of

objects, organized into

objects. For example, if any

objects are added to an instance of this class, they are all stored in a single

. It is the

returned by a call to the

method in the

class. Similarly, any

objects are stored in the

returned by a call to the

method in the

class. Thus, this class represents a collection of

objects.

When the add method is called to add a Permission, the Permission is stored in the appropriate PermissionCollection. If no such collection exists yet, the Permission object's class is determined and the newPermissionCollection method is called on that class to create the PermissionCollection and add it to the Permissions object. If newPermissionCollection returns null, then a default PermissionCollection that uses a hashtable will be created and used. Each hashtable entry stores a Permission object as both the key and the value.

Enumerations returned via the elements method are not fail-fast. Modifications to a collection should not be performed while enumerating over that collection.

Since:

1.2

See Also:

• Permission
• PermissionCollection
• AllPermission

• Constructor Summary

  Constructors

  Creates a new Permissions object containing no PermissionCollection objects.

• Method Summary

  void

  Adds a Permission object to the PermissionCollection for the class the permission belongs to.

  Returns an enumeration of all the Permission objects in all the PermissionCollection objects in this Permissions object.

  boolean

  Checks to see if this object's PermissionCollection for permissions of the specified permission's class implies the permissions expressed in the permission object.

• Constructor Details
  • Permissions

    public Permissions()

    Creates a new Permissions object containing no PermissionCollection objects.

• Method Details
  • add

    Adds a Permission object to the PermissionCollection for the class the permission belongs to. For example, if permission is a FilePermission, it is added to the FilePermissionCollection stored in this Permissions object. This method creates a new PermissionCollection object (and adds the permission to it) if an appropriate collection does not yet exist.

    Specified by:

    add in class PermissionCollection

    Parameters:

    permission - the Permission object to add.

    Throws:

    SecurityException - if this Permissions object is marked as readonly.

    See Also:

    • PermissionCollection.isReadOnly()

  • implies

    Checks to see if this object's

    PermissionCollection

    for permissions of the specified permission's class implies the permissions expressed in the

    permission

    object. Returns

    true

    if the combination of permissions in the appropriate

    PermissionCollection

    (e.g., a

    FilePermissionCollection

    for a

    FilePermission

    ) together imply the specified permission.

    For example, suppose there is a FilePermissionCollection in this Permissions object, and it contains one FilePermission that specifies "read" access for all files in all subdirectories of the "/tmp" directory, and another FilePermission that specifies "write" access for all files in the "/tmp/scratch/foo" directory. Then if the implies method is called with a permission specifying both "read" and "write" access to files in the "/tmp/scratch/foo" directory, true is returned.

    Additionally, if this PermissionCollection contains the AllPermission, this method will always return true.

    Specified by:

    implies in class PermissionCollection

    Parameters:

    permission - the Permission object to check.

    Returns:

    true if "permission" is implied by the permissions in the PermissionCollection it belongs to, false if not.

  • elements

    Returns an enumeration of all the Permission objects in all the PermissionCollection objects in this Permissions object.

    Specified by:

    elements in class PermissionCollection

    Returns:

    an enumeration of all the Permission objects.

    See Also:

    • PermissionCollection.elementsAsStream()

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