/*

 * Copyright 1999-2007 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package javax.crypto;

import java.security.*;

import java.util.Enumeration;

import java.util.Vector;

/**

 * The CryptoAllPermission is a permission that implies

 * any other crypto permissions.

 * <p>

 *

 * @see java.security.Permission

 * @see java.security.AllPermission

 *

 * @author Sharon Liu

 * @since 1.4

 */

final class CryptoAllPermission extends CryptoPermission {

    private static final long serialVersionUID = -5066513634293192112L;

    // This class is similar to java.security.AllPermission.

    static final String ALG_NAME = "CryptoAllPermission";

    static final CryptoAllPermission INSTANCE =

        new CryptoAllPermission();

    private CryptoAllPermission() {

        super(ALG_NAME);

    }

    /**

     * Checks if the specified permission is implied by

     * this object.

     *

     * @param p the permission to check against.

     *

     * @return true if the specified permission is an

     * instance of CryptoPermission.

     */

    public boolean implies(Permission p) {

         return (p instanceof CryptoPermission);

    }

    /**

     * Checks two CryptoAllPermission objects for equality.

     * Two CryptoAllPermission objects are always equal.

     *

     * @param obj the object to test for equality with this object.

     *

     * @return true if <i>obj</i> is a CryptoAllPermission object.

     */

    public boolean equals(Object obj) {

        return (obj == INSTANCE);

    }

    /**

     *

     * Returns the hash code value for this object.

     *

     * @return a hash code value for this object.

     */

    public int hashCode() {

        return 1;

    }

    /**

     * Returns a new PermissionCollection object for storing

     * CryptoAllPermission objects.

     * <p>

     *

     * @return a new PermissionCollection object suitable for

     * storing CryptoAllPermissions.

     */

    public PermissionCollection newPermissionCollection() {

        return new CryptoAllPermissionCollection();

    }

}

/**

 * A CryptoAllPermissionCollection stores a collection

 * of CryptoAllPermission permissions.

 *

 * @see java.security.Permission

 * @see java.security.Permissions

 * @see javax.crypto.CryptoPermission

 *

 * @author Sharon Liu

 */

final class CryptoAllPermissionCollection extends PermissionCollection

    implements java.io.Serializable

{

    private static final long serialVersionUID = 7450076868380144072L;

    // true if a CryptoAllPermission has been added

    private boolean all_allowed;

    /**

     * Create an empty CryptoAllPermissions object.

     */

    CryptoAllPermissionCollection() {

        all_allowed = false;

    }

    /**

     * Adds a permission to the CryptoAllPermissions.

     *

     * @param permission the Permission object to add.

     *

     * @exception SecurityException - if this CryptoAllPermissionCollection

     * object has been marked readonly

     */

    public void add(Permission permission)

    {

        if (isReadOnly())

            throw new SecurityException("attempt to add a Permission to " +

                                        "a readonly PermissionCollection");

        if (permission != CryptoAllPermission.INSTANCE)

            return;

        all_allowed = true;

    }

    /**

     * Check and see if this set of permissions implies the permissions

     * expressed in "permission".

     *

     * @param p the Permission object to compare

     *

     * @return true if the given permission is implied by this

     * CryptoAllPermissionCollection.

     */

    public boolean implies(Permission permission)

    {

        if (!(permission instanceof CryptoPermission)) {

            return false;

        }

        return all_allowed;

    }

    /**

     * Returns an enumeration of all the CryptoAllPermission

     * objects in the  container.

     *

     * @return an enumeration of all the CryptoAllPermission objects.

     */

    public Enumeration elements() {

        Vector v = new Vector(1);

        if (all_allowed) v.add(CryptoAllPermission.INSTANCE);

        return v.elements();

    }

}