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 org.apache.commons.discovery.ResourceNameDiscover; 020 import org.apache.commons.discovery.ResourceNameIterator; 021 import org.apache.commons.discovery.log.DiscoveryLogFactory; 022 import org.apache.commons.discovery.tools.ManagedProperties; 023 import org.apache.commons.logging.Log; 024 025 026 /** 027 * Recover resource name from Managed Properties. 028 * @see org.apache.commons.discovery.tools.ManagedProperties 029 * 030 * @author Richard A. Sitze 031 */ 032 public class DiscoverNamesInManagedProperties 033 extends ResourceNameDiscoverImpl 034 implements ResourceNameDiscover 035 { 036 private static Log log = DiscoveryLogFactory.newLog(DiscoverNamesInManagedProperties.class); 037 public static void setLog(Log _log) { 038 log = _log; 039 } 040 041 042 private final String _prefix; 043 private final String _suffix; 044 045 /** Construct a new resource discoverer 046 */ 047 public DiscoverNamesInManagedProperties() { 048 _prefix = null; 049 _suffix = null; 050 } 051 052 /** Construct a new resource discoverer 053 */ 054 public DiscoverNamesInManagedProperties(String prefix, String suffix) { 055 _prefix = prefix; 056 _suffix = suffix; 057 } 058 059 /** 060 * @return Enumeration of ResourceInfo 061 */ 062 public ResourceNameIterator findResourceNames(final String resourceName) { 063 String name; 064 if (_prefix != null && _prefix.length() > 0) { 065 name = _prefix + resourceName; 066 } else { 067 name = resourceName; 068 } 069 070 if (_suffix != null && _suffix.length() > 0) { 071 name = name + _suffix; 072 } 073 074 if (log.isDebugEnabled()) { 075 if (_prefix != null && _suffix != null) { 076 log.debug("find: resourceName='" + resourceName + "' as '" + name + "'"); 077 } else { 078 log.debug("find: resourceName = '" + name + "'"); 079 } 080 } 081 082 final String newResourcName = name; 083 return new ResourceNameIterator() { 084 private String resource = ManagedProperties.getProperty(newResourcName); 085 public boolean hasNext() { 086 return resource != null; 087 } 088 089 public String nextResourceName() { 090 String element = resource; 091 resource = null; 092 return element; 093 } 094 }; 095 } 096 }