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 com.google.clearsilver.jsilver.exceptions.JSilverTemplateNotFoundException; 20 21 import java.io.File; 22 import java.io.IOException; 23 import java.io.InputStream; 24 import java.io.InputStreamReader; 25 import java.io.Reader; 26 27 /** 28 * Loads resources from classpath. 29 * 30 * <p> 31 * For example, suppose the classpath contains: 32 * 33 * <pre> 34 * com/foo/my-template.cs 35 * com/foo/subdir/another-template.cs 36 * </pre> 37 * 38 * <p> 39 * You can access the resources like this: 40 * 41 * <pre> 42 * ResourceLoader loader = 43 * new ClassPathResourceLoader(getClassLoader(), "com/foo"); 44 * loader.open("my-template.cs"); 45 * loader.open("subdir/my-template.cs"); 46 * </pre> 47 * 48 * @see ResourceLoader 49 * @see ClassResourceLoader 50 */ 51 public class ClassLoaderResourceLoader extends BufferedResourceLoader { 52 53 private final ClassLoader classLoader; 54 private String basePath; 55 56 public ClassLoaderResourceLoader(ClassLoader classLoader, String basePath) { 57 this.classLoader = classLoader; 58 this.basePath = basePath; 59 } 60 61 public ClassLoaderResourceLoader(ClassLoader classLoader) { 62 this(classLoader, "."); 63 } 64 65 @Override 66 public Reader open(String name) throws IOException { 67 String path = basePath + '/' + name; 68 InputStream stream = classLoader.getResourceAsStream(path); 69 return stream == null ? null : buffer(new InputStreamReader(stream, getCharacterSet())); 70 } 71 72 @Override 73 public Reader openOrFail(String name) throws JSilverTemplateNotFoundException, IOException { 74 Reader reader = open(name); 75 if (reader == null) { 76 throw new JSilverTemplateNotFoundException("No class loader resource '" + name + "' in '" 77 + basePath + "'"); 78 } else { 79 return reader; 80 } 81 } 82 83 } 84
