/**
* Check and see if this collection of permissions implies the permissions expressed in
* "permission".
*
* @param p the Permission object to compare
* @return true if "permission" is a proper subset of a permission in the collection, false if
* not.
*/
public boolean implies(Permission permission) {
if (!(permission instanceof ServicePermission)) return false;
ServicePermission np = (ServicePermission) permission;
int desired = np.getMask();
int effective = 0;
int needed = desired;
synchronized (this) {
int len = perms.size();
// need to deal with the case where the needed permission has
// more than one action and the collection has individual permissions
// that sum up to the needed.
for (int i = 0; i < len; i++) {
ServicePermission x = (ServicePermission) perms.get(i);
// System.out.println(" trying "+x);
if (((needed & x.getMask()) != 0) && x.impliesIgnoreMask(np)) {
effective |= x.getMask();
if ((effective & desired) == desired) return true;
needed = (desired ^ effective);
}
}
}
return false;
}
/**
* Checks two ServicePermission objects for equality.
*
* <p>
*
* @param obj the object to test for equality with this object.
* @return true if <i>obj</i> is a ServicePermission, and has the same service principal, and
* actions as this ServicePermission object.
*/
public boolean equals(Object obj) {
if (obj == this) return true;
if (!(obj instanceof ServicePermission)) return false;
ServicePermission that = (ServicePermission) obj;
return ((this.mask & that.mask) == that.mask) && this.getName().equals(that.getName());
}
boolean impliesIgnoreMask(ServicePermission p) {
return ((this.getName().equals("*")) || this.getName().equals(p.getName()));
}
