1 /* 2 * Copyright (C) 2010 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.clearsilver.jsilver.resourceloader; 18 19 import java.io.IOException; 20 import java.io.Reader; 21 22 /** 23 * Implementations of ResourceLoader should extend this class rather than directly implement the 24 * ResourceLoader interface - this allows changes to be made to the ResourceLoader interface whilst 25 * retaining backwards compatibility with existing implementations. 26 * 27 * @see ResourceLoader 28 */ 29 public abstract class BaseResourceLoader implements ResourceLoader { 30 31 @Override close(Reader reader)32 public void close(Reader reader) throws IOException { 33 reader.close(); 34 } 35 36 /** 37 * Default implementation returns the filename as the ResourceLoaders that subclass this class 38 * tend to assume they are the only ResourceLoader in use. Or at least that the filename is the 39 * only necessary form of uniqueness between two instances of this same ResourceLoader. 40 */ 41 @Override getKey(String filename)42 public Object getKey(String filename) { 43 return filename; 44 } 45 46 /** 47 * Default implementation does not check whether the resource has changed. 48 */ 49 @Override getResourceVersionId(String filename)50 public Object getResourceVersionId(String filename) { 51 return filename; 52 } 53 } 54