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package java.security;


A DomainCombiner provides a means to dynamically update the ProtectionDomains associated with the current AccessControlContext. 
 A DomainCombiner is passed as a parameter to the appropriate constructor for AccessControlContext. The newly constructed context is then passed to the AccessController.doPrivileged(..., context) method to bind the provided context (and associated DomainCombiner) with the current execution Thread. Subsequent calls to AccessController.getContext or AccessController.checkPermission cause the DomainCombiner.combine to get invoked. 
 The combine method takes two arguments. The first argument represents an array of ProtectionDomains from the current execution Thread, since the most recent call to AccessController.doPrivileged. If no call to doPrivileged was made, then the first argument will contain all the ProtectionDomains from the current execution Thread. The second argument represents an array of inherited ProtectionDomains, which may be null. ProtectionDomains may be inherited from a parent Thread, or from a privileged context. If no call to doPrivileged was made, then the second argument will contain the ProtectionDomains inherited from the parent Thread. If one or more calls to doPrivileged were made, and the most recent call was to doPrivileged(action, context), then the second argument will contain the ProtectionDomains from the privileged context. If the most recent call was to doPrivileged(action), then there is no privileged context, and the second argument will be null. 
 The combine method investigates the two input arrays of ProtectionDomains and returns a single array containing the updated ProtectionDomains. In the simplest case, the combine method merges the two stacks into one. In more complex cases, the combine method returns a modified stack of ProtectionDomains. The modification may have added new ProtectionDomains, removed certain ProtectionDomains, or simply updated existing ProtectionDomains. Re-ordering and other optimizations to the ProtectionDomains are also permitted. Typically the combine method bases its updates on the information encapsulated in the DomainCombiner. 
 After the AccessController.getContext method receives the combined stack of ProtectionDomains back from the DomainCombiner, it returns a new AccessControlContext that has both the combined ProtectionDomains as well as the DomainCombiner. 
See Also:
Since:1.3
/**
 * A {@code DomainCombiner} provides a means to dynamically
 * update the ProtectionDomains associated with the current
 * {@code AccessControlContext}.
 *
 * <p> A {@code DomainCombiner} is passed as a parameter to the
 * appropriate constructor for {@code AccessControlContext}.
 * The newly constructed context is then passed to the
 * {@code AccessController.doPrivileged(..., context)} method
 * to bind the provided context (and associated {@code DomainCombiner})
 * with the current execution Thread.  Subsequent calls to
 * {@code AccessController.getContext} or
 * {@code AccessController.checkPermission}
 * cause the {@code DomainCombiner.combine} to get invoked.
 *
 * <p> The combine method takes two arguments.  The first argument represents
 * an array of ProtectionDomains from the current execution Thread,
 * since the most recent call to {@code AccessController.doPrivileged}.
 * If no call to doPrivileged was made, then the first argument will contain
 * all the ProtectionDomains from the current execution Thread.
 * The second argument represents an array of inherited ProtectionDomains,
 * which may be {@code null}.  ProtectionDomains may be inherited
 * from a parent Thread, or from a privileged context.  If no call to
 * doPrivileged was made, then the second argument will contain the
 * ProtectionDomains inherited from the parent Thread.  If one or more calls
 * to doPrivileged were made, and the most recent call was to
 * doPrivileged(action, context), then the second argument will contain the
 * ProtectionDomains from the privileged context.  If the most recent call
 * was to doPrivileged(action), then there is no privileged context,
 * and the second argument will be {@code null}.
 *
 * <p> The {@code combine} method investigates the two input arrays
 * of ProtectionDomains and returns a single array containing the updated
 * ProtectionDomains.  In the simplest case, the {@code combine}
 * method merges the two stacks into one.  In more complex cases,
 * the {@code combine} method returns a modified
 * stack of ProtectionDomains.  The modification may have added new
 * ProtectionDomains, removed certain ProtectionDomains, or simply
 * updated existing ProtectionDomains.  Re-ordering and other optimizations
 * to the ProtectionDomains are also permitted.  Typically the
 * {@code combine} method bases its updates on the information
 * encapsulated in the {@code DomainCombiner}.
 *
 * <p> After the {@code AccessController.getContext} method
 * receives the combined stack of ProtectionDomains back from
 * the {@code DomainCombiner}, it returns a new
 * AccessControlContext that has both the combined ProtectionDomains
 * as well as the {@code DomainCombiner}.
 *
 * @see AccessController
 * @see AccessControlContext
 * @since 1.3
 */
public interface DomainCombiner {

    
Modify or update the provided ProtectionDomains.
ProtectionDomains may be added to or removed from the given
ProtectionDomains.  The ProtectionDomains may be re-ordered.
Individual ProtectionDomains may be modified (with a new
set of Permissions, for example).

Params:
  • currentDomains – the ProtectionDomains associated with the current execution Thread, up to the most recent privileged ProtectionDomain. The ProtectionDomains are listed in order of execution, with the most recently executing ProtectionDomain residing at the beginning of the array. This parameter may be null if the current execution Thread has no associated ProtectionDomains.
  • assignedDomains – an array of inherited ProtectionDomains. ProtectionDomains may be inherited from a parent Thread, or from a privileged AccessControlContext. This parameter may be null if there are no inherited ProtectionDomains.
Returns:a new array consisting of the updated ProtectionDomains, or null.
/**
     * Modify or update the provided ProtectionDomains.
     * ProtectionDomains may be added to or removed from the given
     * ProtectionDomains.  The ProtectionDomains may be re-ordered.
     * Individual ProtectionDomains may be modified (with a new
     * set of Permissions, for example).
     *
     * @param currentDomains the ProtectionDomains associated with the
     *          current execution Thread, up to the most recent
     *          privileged {@code ProtectionDomain}.
     *          The ProtectionDomains are listed in order of execution,
     *          with the most recently executing {@code ProtectionDomain}
     *          residing at the beginning of the array. This parameter may
     *          be {@code null} if the current execution Thread
     *          has no associated ProtectionDomains.
     *
     * @param assignedDomains an array of inherited ProtectionDomains.
     *          ProtectionDomains may be inherited from a parent Thread,
     *          or from a privileged {@code AccessControlContext}.
     *          This parameter may be {@code null}
     *          if there are no inherited ProtectionDomains.
     *
     * @return a new array consisting of the updated ProtectionDomains,
     *          or {@code null}.
     */
    ProtectionDomain[] combine(ProtectionDomain[] currentDomains,
                                ProtectionDomain[] assignedDomains);
}