1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package java.security; 19 20 import java.util.Enumeration; 21 import java.util.Hashtable; 22 23 /** 24 * A default {@code PermissionCollection} implementation that uses a hashtable. 25 * Each hashtable entry stores a Permission object as both the key and the 26 * value. 27 * <p> 28 * This {@code PermissionCollection} is intended for storing "neutral" 29 * permissions which do not require special collection. 30 */ 31 32 final class PermissionsHash extends PermissionCollection { 33 34 private static final long serialVersionUID = -8491988220802933440L; 35 36 private final Hashtable perms = new Hashtable(); 37 38 /** 39 * Adds the argument to the collection. 40 * 41 * @param permission 42 * the permission to add to the collection. 43 */ 44 public void add(Permission permission) { 45 perms.put(permission, permission); 46 } 47 48 /** 49 * Returns an enumeration of the permissions in the receiver. 50 * 51 * @return Enumeration the permissions in the receiver. 52 */ 53 public Enumeration elements() { 54 return perms.elements(); 55 } 56 57 /** 58 * Indicates whether the argument permission is implied by the permissions 59 * contained in the receiver. 60 * 61 * @return boolean <code>true</code> if the argument permission is implied 62 * by the permissions in the receiver, and <code>false</code> if 63 * it is not. 64 * @param permission 65 * java.security.Permission the permission to check 66 */ 67 public boolean implies(Permission permission) { 68 for (Enumeration elements = elements(); elements.hasMoreElements();) { 69 if (((Permission)elements.nextElement()).implies(permission)) { 70 return true; 71 } 72 } 73 return false; 74 } 75 } 76
