1 package org.apache.velocity.runtime.resource.loader;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 import org.apache.velocity.runtime.RuntimeServices;
23 import org.apache.velocity.util.ClassUtils;
24 import org.apache.velocity.util.StringUtils;
25
26 /**
27 * Factory to grab a template loader.
28 *
29 * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
30 * @version $Id: ResourceLoaderFactory.java 463298 2006-10-12 16:10:32Z henning $
31 */
32 public class ResourceLoaderFactory
33 {
34 /**
35 * Gets the loader specified in the configuration file.
36 * @param rs
37 * @param loaderClassName
38 * @return TemplateLoader
39 * @throws Exception
40 */
41 public static ResourceLoader getLoader(RuntimeServices rs, String loaderClassName)
42 throws Exception
43 {
44 ResourceLoader loader = null;
45
46 try
47 {
48 loader = (ResourceLoader) ClassUtils.getNewInstance( loaderClassName );
49
50 rs.getLog().debug("ResourceLoader instantiated: "
51 + loader.getClass().getName());
52
53 return loader;
54 }
55 // The ugly three strike again: ClassNotFoundException,IllegalAccessException,InstantiationException
56 catch(Exception e)
57 {
58 rs.getLog().error("Problem instantiating the template loader.\n" +
59 "Look at your properties file and make sure the\n" +
60 "name of the template loader is correct. Here is the\n" +
61 "error:", e);
62
63 throw new Exception("Problem initializing template loader: " + loaderClassName +
64 "\nError is: " + StringUtils.stackTrace(e));
65 }
66 }
67 }