/*
* JBoss, Home of Professional Open Source
* Copyright 2009, 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.privilegedactions;

import java.security.PrivilegedAction;

import org.hibernate.validator.internal.util.Contracts;

import static org.hibernate.validator.internal.util.logging.Messages.MESSAGES;

/**
 * @author Emmanuel Bernard
 */
public final class GetClassLoader implements PrivilegedAction<ClassLoader> {
	private final Class<?> clazz;

	public static GetClassLoader fromContext() {
		return new GetClassLoader( null );
	}

	public static GetClassLoader fromClass(Class<?> clazz) {
		Contracts.assertNotNull( clazz, MESSAGES.classIsNull() );
		return new GetClassLoader( clazz );
	}

	private GetClassLoader(Class<?> clazz) {
		this.clazz = clazz;
	}

	public ClassLoader run() {
		if ( clazz != null ) {
			return clazz.getClassLoader();
		}
		else {
			return Thread.currentThread().getContextClassLoader();
		}
	}
}
