01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * 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: package org.apache.commons.discovery.resource.names;
18:
19: import org.apache.commons.discovery.ResourceNameDiscover;
20: import org.apache.commons.discovery.ResourceNameIterator;
21: import org.apache.commons.discovery.log.DiscoveryLogFactory;
22: import org.apache.commons.logging.Log;
23:
24: /**
25: * Recover resource name from System Properties.
26: *
27: * @author Richard A. Sitze
28: */
29: public class DiscoverNamesInSystemProperties extends
30: ResourceNameDiscoverImpl implements ResourceNameDiscover {
31: private static Log log = DiscoveryLogFactory
32: .newLog(DiscoverNamesInSystemProperties.class);
33:
34: public static void setLog(Log _log) {
35: log = _log;
36: }
37:
38: /** Construct a new resource discoverer
39: */
40: public DiscoverNamesInSystemProperties() {
41: }
42:
43: /**
44: * @return Enumeration of ResourceInfo
45: */
46: public ResourceNameIterator findResourceNames(
47: final String resourceName) {
48: if (log.isDebugEnabled())
49: log.debug("find: resourceName='" + resourceName + "'");
50:
51: return new ResourceNameIterator() {
52: private String resource = System.getProperty(resourceName);
53:
54: public boolean hasNext() {
55: return resource != null;
56: }
57:
58: public String nextResourceName() {
59: String element = resource;
60: resource = null;
61: return element;
62: }
63: };
64: }
65: }
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