/*
* 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.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
/**
* Loads resources from classpath.
*
* <p>
* For example, suppose the classpath contains:
*
* <pre>
* com/foo/my-template.cs
* com/foo/subdir/another-template.cs
* </pre>
*
* <p>
* You can access the resources like this:
*
* <pre>
* ResourceLoader loader =
* new ClassPathResourceLoader(getClassLoader(), "com/foo");
* loader.open("my-template.cs");
* loader.open("subdir/my-template.cs");
* </pre>
*
* @see ResourceLoader
* @see ClassResourceLoader
*/
public class ClassLoaderResourceLoader extends BufferedResourceLoader {
private final ClassLoader classLoader;
private String basePath;
public ClassLoaderResourceLoader(ClassLoader classLoader, String basePath) {
this.classLoader = classLoader;
this.basePath = basePath;
}
public ClassLoaderResourceLoader(ClassLoader classLoader) {
this(classLoader, ".");
}
@Override
public Reader open(String name) throws IOException {
String path = basePath + '/' + name;
InputStream stream = classLoader.getResourceAsStream(path);
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 class loader resource '" + name + "' in '"
+ basePath + "'");
} else {
return reader;
}
}
}