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.logging.Log; 023 024 025 /** 026 * Recover resource name from System Properties. 027 * 028 * @author Richard A. Sitze 029 */ 030 public class DiscoverNamesInSystemProperties 031 extends ResourceNameDiscoverImpl 032 implements ResourceNameDiscover 033 { 034 private static Log log = DiscoveryLogFactory.newLog(DiscoverNamesInSystemProperties.class); 035 public static void setLog(Log _log) { 036 log = _log; 037 } 038 039 /** Construct a new resource discoverer 040 */ 041 public DiscoverNamesInSystemProperties() { 042 } 043 044 /** 045 * @return Enumeration of ResourceInfo 046 */ 047 public ResourceNameIterator findResourceNames(final String resourceName) { 048 if (log.isDebugEnabled()) 049 log.debug("find: resourceName='" + resourceName + "'"); 050 051 return new ResourceNameIterator() { 052 private String resource = System.getProperty(resourceName); 053 054 public boolean hasNext() { 055 return resource != null; 056 } 057 058 public String nextResourceName() { 059 String element = resource; 060 resource = null; 061 return element; 062 } 063 }; 064 } 065 }