org.hibernate.validator.internal.util.ResourceLoaderHelper Maven / Gradle / Ivy
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* Copyright 2012, Red Hat, Inc. and/or its affiliates, and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* 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 org.hibernate.validator.internal.util;
import java.io.BufferedInputStream;
import java.io.InputStream;
import org.hibernate.validator.internal.util.logging.Log;
import org.hibernate.validator.internal.util.logging.LoggerFactory;
/**
* Helper methods for loading resource files
*
* @author Hardy Ferentschik
*/
public final class ResourceLoaderHelper {
private static final Log log = LoggerFactory.make();
/**
* Returns an input stream for the given path, which supports the mark/reset
* contract.
*
* @param path The path of the requested input stream.
*
* @return An input stream for the given path or {@code null} if no such
* resource exists.
*
* @see InputStream#markSupported()
*/
public static InputStream getResettableInputStreamForPath(String path) {
//TODO not sure if it's the right thing to removing '/'
String inputPath = path;
if ( inputPath.startsWith( "/" ) ) {
inputPath = inputPath.substring( 1 );
}
boolean isContextCL = true;
// try the context class loader first
ClassLoader loader = ReflectionHelper.getClassLoaderFromContext();
if ( loader == null ) {
log.debug( "No default context class loader, fall back to Bean Validation's loader" );
loader = ReflectionHelper.getClassLoaderFromClass( ResourceLoaderHelper.class );
isContextCL = false;
}
InputStream inputStream = loader.getResourceAsStream( inputPath );
// try the current class loader
if ( isContextCL && inputStream == null ) {
loader = ReflectionHelper.getClassLoaderFromClass( ResourceLoaderHelper.class );
inputStream = loader.getResourceAsStream( inputPath );
}
if ( inputStream == null ) {
return null;
}
else if ( inputStream.markSupported() ) {
return inputStream;
}
else {
return new BufferedInputStream( inputStream );
}
}
}