/**
* Copyright 2011-2014 Asakusa Framework Team.
*
* 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.asakusafw.bulkloader.common;
import java.net.URL;
import java.net.URLStreamHandlerFactory;
import org.apache.hadoop.fs.FsUrlStreamHandlerFactory;
/**
* {@link URLStreamHandlerFactory}を一度だけ登録する。
*/
public final class UrlStreamHandlerFactoryRegisterer {
private static volatile boolean registered;
/**
* {@link URLStreamHandlerFactory}を一度だけ登録する。
*/
public static synchronized void register() {
if (registered) {
return;
}
FsUrlStreamHandlerFactory factory = new FsUrlStreamHandlerFactory();
try {
URL.setURLStreamHandlerFactory(factory);
} catch (Error e) {
if (e.getClass().equals(Error.class)) {
// ok.
return;
}
throw e;
}
registered = true;
}
private UrlStreamHandlerFactoryRegisterer() {
return;
}
}