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.scxml.env;
018
019 import java.io.Serializable;
020 import java.net.MalformedURLException;
021 import java.net.URL;
022
023 import org.apache.commons.logging.Log;
024 import org.apache.commons.logging.LogFactory;
025 import org.apache.commons.scxml.PathResolver;
026
027 /**
028 * A PathResolver implementation that resolves against a base URL.
029 *
030 * @see org.apache.commons.scxml.PathResolver
031 */
032 public class URLResolver implements PathResolver, Serializable {
033
034 /** Serial version UID. */
035 private static final long serialVersionUID = 1L;
036
037 /** Implementation independent log category. */
038 private Log log = LogFactory.getLog(PathResolver.class);
039
040 /** The base URL to resolve against. */
041 private URL baseURL = null;
042
043 /**
044 * Constructor.
045 *
046 * @param baseURL The base URL to resolve against
047 */
048 public URLResolver(final URL baseURL) {
049 this.baseURL = baseURL;
050 }
051
052 /**
053 * Uses URL(URL, String) constructor to combine URL's.
054 * @see org.apache.commons.scxml.PathResolver#resolvePath(java.lang.String)
055 */
056 public String resolvePath(final String ctxPath) {
057 URL combined;
058 try {
059 combined = new URL(baseURL, ctxPath);
060 return combined.toString();
061 } catch (MalformedURLException e) {
062 log.error("Malformed URL", e);
063 }
064 return null;
065 }
066
067 /**
068 * @see org.apache.commons.scxml.PathResolver#getResolver(java.lang.String)
069 */
070 public PathResolver getResolver(final String ctxPath) {
071 URL combined;
072 try {
073 combined = new URL(baseURL, ctxPath);
074 return new URLResolver(combined);
075 } catch (MalformedURLException e) {
076 log.error("Malformed URL", e);
077 }
078 return null;
079 }
080
081 }
082