/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.isis.core.commons.lang;
import java.io.InputStream;
import java.net.URL;
/**
* Adapted from Ibatis Common, now with some additional guava stuff.
*/
public class ResourceUtil {
private ResourceUtil(){}
/**
* Returns the URL, or null if not available.
*/
public static URL getResourceURL(final String resource) {
// try thread's classloader
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
URL url = classLoader.getResource(resource);
if (url != null) {
return url;
}
// try this class' classloader
classLoader = ResourceUtil.class.getClassLoader();
url = classLoader.getResource(resource);
if (url != null) {
return url;
}
// try system class loader (could return null)
// wrapping in a try...catch because when running tests by Maven for a
// non-existing
// resource, seems to bomb out. Is okay when run from Eclipse. A bit of
// a puzzle.
try {
return ClassLoader.getSystemResource(resource);
} catch (final NullPointerException ignore) {
return null;
}
}
public static InputStream getResourceAsStream(final String resource) {
// try thread's classloader
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
InputStream is = classLoader.getResourceAsStream(resource);
if (is != null) {
return is;
}
// try this class' classloader
classLoader = ResourceUtil.class.getClassLoader();
is = classLoader.getResourceAsStream(resource);
if (is != null) {
return is;
}
// try system class loader (could return null)
// have wrapped in a try...catch because for same reason as
// getResourceURL
try {
return ClassLoader.getSystemResourceAsStream(resource);
} catch (final NullPointerException ignore) {
return null;
}
}
}