| /* |
| * Copyright (C) 2010 Google Inc. |
| * |
| * 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 com.google.clearsilver.jsilver.resourceloader; |
| |
| import com.google.clearsilver.jsilver.exceptions.JSilverTemplateNotFoundException; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.InputStreamReader; |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| /** |
| * Loads resources from a directory. |
| * |
| * @see ResourceLoader |
| */ |
| public class FileSystemResourceLoader extends BufferedResourceLoader { |
| |
| private final File rootDir; |
| |
| public FileSystemResourceLoader(File rootDir) { |
| this.rootDir = rootDir; |
| } |
| |
| public FileSystemResourceLoader(String rootDir) { |
| this(new File(rootDir)); |
| } |
| |
| @Override |
| public Reader open(String name) throws IOException { |
| File file = new File(rootDir, name); |
| // Check for non-directory rather than is-file so that reads from |
| // e.g. pipes work. |
| if (file.exists() && !file.isDirectory() && file.canRead()) { |
| return buffer(new InputStreamReader(new FileInputStream(file), getCharacterSet())); |
| } else { |
| return null; |
| } |
| } |
| |
| @Override |
| public Reader openOrFail(String name) throws JSilverTemplateNotFoundException, IOException { |
| Reader reader = open(name); |
| if (reader == null) { |
| throw new JSilverTemplateNotFoundException("No file '" + name + "' inside directory '" |
| + rootDir + "'"); |
| } else { |
| return reader; |
| } |
| } |
| |
| /** |
| * Some applications, e.g. online help, need to know when a file has changed due to a symlink |
| * modification hence the use of {@link File#getCanonicalFile()}, if possible. |
| */ |
| @Override |
| public Object getResourceVersionId(String filename) { |
| File file = new File(rootDir, filename); |
| // Check for non-directory rather than is-file so that reads from |
| // e.g. pipes work. |
| if (file.exists() && !file.isDirectory() && file.canRead()) { |
| String fullPath; |
| try { |
| fullPath = file.getCanonicalPath(); |
| } catch (IOException e) { |
| fullPath = file.getAbsolutePath(); |
| } |
| return String.format("%s@%s", fullPath, file.lastModified()); |
| } else { |
| return null; |
| } |
| } |
| } |