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.scxml.env;
18:
19: import java.io.Serializable;
20: import java.net.MalformedURLException;
21: import java.net.URL;
22:
23: import org.apache.commons.logging.Log;
24: import org.apache.commons.logging.LogFactory;
25: import org.apache.commons.scxml.PathResolver;
26:
27: /**
28: * A PathResolver implementation that resolves against a base URL.
29: *
30: * @see org.apache.commons.scxml.PathResolver
31: */
32: public class URLResolver implements PathResolver, Serializable {
33:
34: /** Serial version UID. */
35: private static final long serialVersionUID = 1L;
36:
37: /** Implementation independent log category. */
38: private Log log = LogFactory.getLog(PathResolver.class);
39:
40: /** The base URL to resolve against. */
41: private URL baseURL = null;
42:
43: /**
44: * Constructor.
45: *
46: * @param baseURL The base URL to resolve against
47: */
48: public URLResolver(final URL baseURL) {
49: this .baseURL = baseURL;
50: }
51:
52: /**
53: * Uses URL(URL, String) constructor to combine URL's.
54: * @see org.apache.commons.scxml.PathResolver#resolvePath(java.lang.String)
55: */
56: public String resolvePath(final String ctxPath) {
57: URL combined;
58: try {
59: combined = new URL(baseURL, ctxPath);
60: return combined.toString();
61: } catch (MalformedURLException e) {
62: log.error("Malformed URL", e);
63: }
64: return null;
65: }
66:
67: /**
68: * @see org.apache.commons.scxml.PathResolver#getResolver(java.lang.String)
69: */
70: public PathResolver getResolver(final String ctxPath) {
71: URL combined;
72: try {
73: combined = new URL(baseURL, ctxPath);
74: return new URLResolver(combined);
75: } catch (MalformedURLException e) {
76: log.error("Malformed URL", e);
77: }
78: return null;
79: }
80:
81: }
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