/**
* jetbrick-template
* http://subchen.github.io/jetbrick-template/
*
* Copyright 2010-2014 Guoqiang Chen. All rights reserved.
* Email: subchen@gmail.com
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package jetbrick.template.resource.loader;
import java.util.ArrayList;
import java.util.List;
import jetbrick.template.JetEngine;
import jetbrick.template.resource.Resource;
import jetbrick.template.utils.ClassLoaderUtils;
import jetbrick.template.utils.ExceptionUtils;
import jetbrick.template.web.WebResourceLoader;
/**
* 可以从多个 path 下面加载资源.
*
* @since 1.1.3
* @author Guoqiang Chen
*/
public class MultipathResourceLoader implements ResourceLoader {
private ResourceLoader[] loaders;
@Override
public void initialize(JetEngine engine, String basepath, String encoding) {
List<ResourceLoader> loaders = new ArrayList<ResourceLoader>();
String[] paths = basepath.split(",");
for (String path : paths) {
ResourceLoader loader;
int pos = path.indexOf(':');
if (pos >= 0) {
String klassAlias = path.substring(0, pos).trim();
path = path.substring(pos + 1).trim();
if ("file".equals(klassAlias)) {
loader = new FileSystemResourceLoader();
} else if ("classpath".equals(klassAlias)) {
loader = new ClasspathResourceLoader();
} else if ("jar".equals(klassAlias)) {
loader = new JarResourceLoader();
} else if ("webapp".equals(klassAlias)) {
loader = new WebResourceLoader();
} else {
// 可能是用户自定义的 ResourceLoader
try {
Class<?> klass = ClassLoaderUtils.loadClass(klassAlias);
loader = (ResourceLoader) klass.newInstance();
} catch (Throwable e) {
throw ExceptionUtils.uncheck(e);
}
}
} else {
path = path.trim();
loader = new FileSystemResourceLoader();
}
loader.initialize(engine, path, encoding);
loaders.add(loader);
}
this.loaders = loaders.toArray(new ResourceLoader[loaders.size()]);
}
@Override
public Resource load(String name) {
for (ResourceLoader loader : loaders) {
Resource resource = loader.load(name);
if (resource != null) {
return resource;
}
}
return null;
}
@Override
public List<String> loadAll() {
List<String> resources = new ArrayList<String>();
for (ResourceLoader loader : loaders) {
resources.addAll(loader.loadAll());
}
return resources;
}
}