/*
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 * Portions of this software are based upon public domain software 
 * originally written at the National Center for Supercomputing 
 * Applications, University of Illinois, Urbana-Champaign.
 *
 */
package gov.nist.security.rbac;

import java.util.*;
/** A default implementation of the IPermission interface. */
public class Permission extends AbstractPermission {
  /** The current set of permission entries. */
  private final IPermissionEntry[] entries;
  /**
   * Constructs with a set of permission entries.
   * Note that client is responsible for ensuring there is no duplicate entries
   * in the specified permission entry list.
   */
  public Permission(IPermissionEntry[] entries) {
    this.entries = entries;
  }
  /**
   * Constructs with a single permission entry.
   * @param obj the target object.
   * @param op the operation.
   */
  public Permission(Object obj, String op) {
    this.entries = new IPermissionEntry[]{new PermissionEntry(obj, op)};
  }
  /**
   * Constructs with a set of permission objects.
   */
  public Permission(IPermission[] p) {
    Set set = new HashSet();
    for (int i=0; i < p.length; i++) {
      IPermissionEntry[] e = p[i].getPermissionEntries();
      for (int j=0; j < e.length; j++) {
        set.add(e[j]);
      }
    }
    this.entries = (IPermissionEntry[])set.toArray(IPermissionEntry.ZERO_PERMISSION_ENTRY);
  }
  /** Returns the permission entry set of this permission. */
  public IPermissionEntry[] getPermissionEntries() {
    return entries;
  }
}