| /* |
| * 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.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.Reader; |
| |
| /** |
| * Loads resources from classpath, alongside a given class. |
| * |
| * <p>For example, suppose the classpath contains: |
| * <pre> |
| * com/foo/SomeThing.class |
| * com/foo/my-template.cs |
| * com/foo/subdir/another-template.cs |
| * </pre> |
| * |
| * <p>You can access the resources in the class's package like this: |
| * <pre> |
| * ResourceLoader loader = new ClassResourceLoader(SomeThing.class); |
| * loader.open("my-template.cs"); |
| * loader.open("subdir/my-template.cs"); |
| * </pre> |
| * Or by using a relative path: |
| * <pre> |
| * ResourceLoader loader = new ClassResourceLoader(Something.class, "subdir"); |
| * loader.open("my-template.cs"); |
| * </pre> |
| * |
| * @see ResourceLoader |
| * @see ClassLoaderResourceLoader |
| */ |
| public class ClassResourceLoader extends BufferedResourceLoader { |
| |
| private final Class<?> cls; |
| private final String basePath; |
| |
| public ClassResourceLoader(Class<?> cls) { |
| this.cls = cls; |
| this.basePath = "."; |
| } |
| |
| /** |
| * Load resources from the given subdirectory {@code basePath}, |
| * relative to the .class file of {@code cls}. |
| */ |
| public ClassResourceLoader(Class<?> cls, String basePath) { |
| this.cls = cls; |
| this.basePath = basePath; |
| } |
| |
| @Override |
| public Reader open(String name) throws IOException { |
| InputStream stream = cls.getResourceAsStream(basePath + '/' + name); |
| return stream == null ? null : buffer(new InputStreamReader(stream, getCharacterSet())); |
| } |
| |
| @Override |
| public Reader openOrFail(String name) throws JSilverTemplateNotFoundException, IOException { |
| Reader reader = open(name); |
| if (reader == null) { |
| throw new JSilverTemplateNotFoundException("No '" + name + "' as class resource of " |
| + cls.getName()); |
| } else { |
| return reader; |
| } |
| } |
| |
| } |