001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.discovery.resource.names; 018 019 import java.util.HashMap; 020 021 import org.apache.commons.discovery.ResourceNameDiscover; 022 import org.apache.commons.discovery.ResourceNameIterator; 023 import org.apache.commons.discovery.log.DiscoveryLogFactory; 024 import org.apache.commons.discovery.tools.ManagedProperties; 025 import org.apache.commons.logging.Log; 026 027 028 /** 029 * Recover resource name from Managed Properties, 030 * using OLD property names. 031 * 032 * This class maintains a mapping between old names and 033 * (new) the class names they represent. The discovery 034 * mechanism uses the class names as property names. 035 * 036 * @see org.apache.commons.discovery.tools.ManagedProperties 037 * 038 * @author Richard A. Sitze 039 */ 040 public class DiscoverNamesInAlternateManagedProperties 041 extends ResourceNameDiscoverImpl 042 implements ResourceNameDiscover 043 { 044 private static Log log = DiscoveryLogFactory.newLog(DiscoverNamesInAlternateManagedProperties.class); 045 public static void setLog(Log _log) { 046 log = _log; 047 } 048 049 HashMap mapping = new HashMap(); 050 051 /** Construct a new resource discoverer 052 */ 053 public DiscoverNamesInAlternateManagedProperties() { 054 } 055 056 /** 057 */ 058 public void addClassToPropertyNameMapping(String className, String propertyName) { 059 mapping.put(className, propertyName); 060 } 061 062 /** 063 * @return Enumeration of ResourceInfo 064 */ 065 public ResourceNameIterator findResourceNames(final String resourceName) { 066 final String mappedName = (String)mapping.get(resourceName); 067 068 if (log.isDebugEnabled()) { 069 if (mappedName == null) { 070 log.debug("find: resourceName='" + resourceName + "', no mapping"); 071 } else { 072 log.debug("find: resourceName='" + resourceName + "', lookup property '" + mappedName + "'"); 073 } 074 } 075 076 return new ResourceNameIterator() { 077 private String resource = 078 (mappedName == null) ? null : ManagedProperties.getProperty(mappedName); 079 080 public boolean hasNext() { 081 return resource != null; 082 } 083 084 public String nextResourceName() { 085 String element = resource; 086 resource = null; 087 return element; 088 } 089 }; 090 } 091 }