1 /* 2 * Copyright 2001-2004 The Apache Software Foundation. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package org.apache.neethi; 17 18 import java.util.HashMap; 19 20 /** 21 * Provides a default implementation of PolicyRegistry interface. 22 */ 23 public class PolicyRegistryImpl implements PolicyRegistry { 24 25 private PolicyRegistry parent = null; 26 27 private HashMap reg = new HashMap(); 28 29 public PolicyRegistryImpl() { 30 } 31 32 /** 33 * Constructs a PolicyRegistryImpl with the specified PolicyRegistry 34 * as it's parent. If it can't lookup a Policy in it's own registry 35 * then it lookup in the parent and returns the results. 36 * 37 * @param parent the Parent of this PolicyRegistry 38 */ 39 public PolicyRegistryImpl(PolicyRegistry parent) { 40 this.parent = parent; 41 } 42 43 public Policy lookup(String key) { 44 Policy policy = (Policy) reg.get(key); 45 46 if (policy == null && parent != null) { 47 return parent.lookup(key); 48 } 49 50 return policy; 51 } 52 53 public void register(String key, Policy policy) { 54 reg.put(key, policy); 55 } 56 57 public void remove(String key) { 58 reg.remove(key); 59 } 60 61 public void setParent(PolicyRegistry parent) { 62 this.parent = parent; 63 } 64 65 public PolicyRegistry getParent() { 66 return parent; 67 } 68 }