jsdsi
Class Tag

java.lang.Object
  jsdsi.Obj
      jsdsi.Tag

All Implemented Interfaces:

java.io.Serializable

Direct Known Subclasses:

ExprTag

public abstract class Tag

extends Obj

Specifies a particular authorization permission.

Version:

$Revision: 1.3.2.1 $ $Date: 2005/11/08 03:12:52 $

Author:

Sameer Ajmani, Sean Radford

See Also:

Serialized Form

Field Summary

static Tag	ALL_TAG A Tag that conveys all permissions.
static Tag	NULL_TAG A Tag that conveys no permissions.

Fields inherited from class jsdsi.Obj

_obj

Constructor Summary

Tag()

Method Summary

boolean	implies(Tag that) Checks if this Tag implies the given tag.
abstract Tag	intersect(Tag that) Intersects this Tag with another one and returns the result.
SexpList	toSexp() Creates an SexpList -representation from this SDSI-object.
protected abstract Sexp	toTagSexp()

Methods inherited from class jsdsi.Obj

equals, hashCode, parseObj, parseObj, readResolve, toByteArray, toString, toString, toTransport

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

ALL_TAG

public static Tag ALL_TAG

A Tag that conveys all permissions.

NULL_TAG

public static Tag NULL_TAG

A Tag that conveys no permissions.

Constructor Detail

Tag

public Tag()

Method Detail

intersect

public abstract Tag intersect(Tag that)

Intersects this Tag with another one and returns the result.

Parameters:

that - tag to intersect this with.

Returns:

the intersection of this Tag and that.

implies

public final boolean implies(Tag that)

Checks if this Tag implies the given tag. Implemented as return this.intersect(that).equals(that).

Parameters:

that - tag to check for if it is implied by this one.

Returns:

true if this tag implies that, false otherwise.

toTagSexp

protected abstract Sexp toTagSexp()

toSexp

public final SexpList toSexp()

Description copied from class: Obj

Creates an SexpList -representation from this SDSI-object.

Specified by:

toSexp in class Obj

Returns:

an SexpList that represents this SDSI-object.