/*
 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */

package java.security;

import java.security.*;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;
import sun.security.util.SecurityConstants;

/**
 * The AllPermission is a permission that implies all other permissions.
 * <p>
 * <b>Note:</b> Granting AllPermission should be done with extreme care,
 * as it implies all other permissions. Thus, it grants code the ability
 * to run with security
 * disabled. Extreme caution should be taken before granting such
 * a permission to code. This permission should be used only during testing,
 * or in extremely rare cases where an application or applet is
 * completely trusted and adding the necessary permissions to the policy
 * is prohibitively cumbersome.
 *
 * @see java.security.Permission
 * @see java.security.AccessController
 * @see java.security.Permissions
 * @see java.security.PermissionCollection
 * @see java.lang.SecurityManager
 *
 *
 * @author Roland Schemers
 *
 * @serial exclude
 */

public final class AllPermission extends Permission {

 private static final long serialVersionUID = -2916474571451318075L;

 /**
 * Creates a new AllPermission object.
 */
 public AllPermission() {
 super("<all permissions>");
 }


 /**
 * Creates a new AllPermission object. This
 * constructor exists for use by the {@code Policy} object
 * to instantiate new Permission objects.
 *
 * @param name ignored
 * @param actions ignored.
 */
 public AllPermission(String name, String actions) {
 this();
 }

 /**
 * Checks if the specified permission is "implied" by
 * this object. This method always returns true.
 *
 * @param p the permission to check against.
 *
 * @return return
 */
 public boolean implies(Permission p) {
 return true;
 }

 /**
 * Checks two AllPermission objects for equality. Two AllPermission
 * objects are always equal.
 *
 * @param obj the object we are testing for equality with this object.
 * @return true if <i>obj</i> is an AllPermission, false otherwise.
 */
 public boolean equals(Object obj) {
 return (obj instanceof AllPermission);
 }

 /**
 * Returns the hash code value for this object.
 *
 * @return a hash code value for this object.
 */

 public int hashCode() {
 return 1;
 }

 /**
 * Returns the canonical string representation of the actions.
 *
 * @return the actions.
 */
 public String getActions() {
 return "<all actions>";
 }

 /**
 * Returns a new PermissionCollection object for storing AllPermission
 * objects.
 * <p>
 *
 * @return a new PermissionCollection object suitable for
 * storing AllPermissions.
 */
 public PermissionCollection newPermissionCollection() {
 return new AllPermissionCollection();
 }

}

/**
 * A AllPermissionCollection stores a collection
 * of AllPermission permissions. AllPermission objects
 * must be stored in a manner that allows them to be inserted in any
 * order, but enable the implies function to evaluate the implies
 * method in an efficient (and consistent) manner.
 *
 * @see java.security.Permission
 * @see java.security.Permissions
 *
 *
 * @author Roland Schemers
 *
 * @serial include
 */

final class AllPermissionCollection
 extends PermissionCollection
 implements java.io.Serializable
{

 // use serialVersionUID from JDK 1.2.2 for interoperability
 private static final long serialVersionUID = -4023755556366636806L;

 private boolean all_allowed; // true if any all permissions have been added

 /**
 * Create an empty AllPermissions object.
 *
 */

 public AllPermissionCollection() {
 all_allowed = false;
 }

 /**
 * Adds a permission to the AllPermissions. The key for the hash is
 * permission.path.
 *
 * @param permission the Permission object to add.
 *
 * @exception IllegalArgumentException - if the permission is not a
 * AllPermission
 *
 * @exception SecurityException - if this AllPermissionCollection object
 * has been marked readonly
 */

 public void add(Permission permission) {
 if (! (permission instanceof AllPermission))
 throw new IllegalArgumentException("invalid permission: "+
 permission);
 if (isReadOnly())
 throw new SecurityException("attempt to add a Permission to a readonly PermissionCollection");

 all_allowed = true; // No sync; staleness OK
 }

 /**
 * Check and see if this set of permissions implies the permissions
 * expressed in "permission".
 *
 * @param permission the Permission object to compare
 *
 * @return always returns true.
 */

 public boolean implies(Permission permission) {
 return all_allowed; // No sync; staleness OK
 }

 /**
 * Returns an enumeration of all the AllPermission objects in the
 * container.
 *
 * @return an enumeration of all the AllPermission objects.
 */
 public Enumeration<Permission> elements() {
 return new Enumeration<Permission>() {
 private boolean hasMore = all_allowed;

 public boolean hasMoreElements() {
 return hasMore;
 }

 public Permission nextElement() {
 hasMore = false;
 return SecurityConstants.ALL_PERMISSION;
 }
 };
 }
}