jif.types.principal

Class ParamPrincipal_c

java.lang.Object

polyglot.types.TypeObject_c

jif.types.Param_c

jif.types.principal.Principal_c

jif.types.principal.ParamPrincipal_c

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, ActsForParam, Param, ParamPrincipal, Principal, polyglot.types.TypeObject, polyglot.util.Copy<polyglot.types.TypeObject>

public class ParamPrincipal_c
extends Principal_c
implements ParamPrincipal

An implementation of the ParamPrincipal interface.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface polyglot.util.Copy

polyglot.util.Copy.Util

Field Summary

Fields inherited from class jif.types.principal.Principal_c

variables

Fields inherited from class polyglot.types.TypeObject_c

position, ts

Constructor Summary

Constructors

Constructor and Description
ParamPrincipal_c(ParamInstance paramInstance, JifTypeSystem ts, polyglot.util.Position pos)

Method Summary

Modifier and Type	Method and Description
boolean	equalsImpl(polyglot.types.TypeObject o)
int	hashCode()
boolean	isCanonical()
boolean	isRuntimeRepresentable()
PathMap	labelCheck(JifContext A, LabelChecker lc) Label check the principal, which will determine how much information may be gained if the principal is evaluated at runtime.
ParamInstance	paramInstance()
java.lang.String	toString()

Methods inherited from class jif.types.principal.Principal_c

hasVariables, isBottomPrincipal, isTopPrincipal, simplify, subst, throwTypes, toJava, variables

Methods inherited from class jif.types.Param_c

typeSystem

Methods inherited from class polyglot.types.TypeObject_c

copy, equals, position

Methods inherited from class java.lang.Object

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

Methods inherited from interface jif.types.principal.Principal

hasVariables, isBottomPrincipal, isTopPrincipal, simplify, subst, throwTypes, variables

Methods inherited from interface jif.types.ActsForParam

toJava

Methods inherited from interface jif.types.Param

typeSystem

Methods inherited from interface polyglot.types.TypeObject

position

Methods inherited from interface polyglot.util.Copy

copy

Constructor Detail

ParamPrincipal_c

public ParamPrincipal_c(ParamInstance paramInstance,
                        JifTypeSystem ts,
                        polyglot.util.Position pos)

Method Detail

paramInstance

public ParamInstance paramInstance()

Specified by:

paramInstance in interface ParamPrincipal

isRuntimeRepresentable

public boolean isRuntimeRepresentable()

Specified by:

isRuntimeRepresentable in interface Param

Specified by:

isRuntimeRepresentable in class Principal_c

isCanonical

public boolean isCanonical()

Specified by:

isCanonical in interface Param

Specified by:

isCanonical in interface polyglot.types.TypeObject

Specified by:

isCanonical in class Principal_c

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

equalsImpl

public boolean equalsImpl(polyglot.types.TypeObject o)

Specified by:

equalsImpl in interface polyglot.types.TypeObject

Specified by:

equalsImpl in class Principal_c

hashCode

public int hashCode()

Specified by:

hashCode in class Principal_c

labelCheck

public PathMap labelCheck(JifContext A,
                          LabelChecker lc)

Description copied from interface: Principal

Label check the principal, which will determine how much information may be gained if the principal is evaluated at runtime. For example, given the dynamic principal p, where p is a local variable, evaluation of this label at runtime will reveal as much information as the label of p. For example, the following code is illegal, as the runtime evaluation of the principal reveals too much information

 boolean{Alice:} secret = ...;
 final principal{Alice:} p = secret?Bob:Chuck;
 boolean{} leak = false;
 if (p actsfor Bob) { // evaluation of p reveals
                      // information at level {Alice:}
     leak = true;
        }
 

Specified by:

labelCheck in interface Principal

Overrides:

labelCheck in class Principal_c

See Also:

JifExt.labelCheck(LabelChecker), Label.labelCheck(JifContext, LabelChecker)