SetContextClassLoaderFromClassAction.java

/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2016 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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.wildfly.security.manager.action;

import java.security.PrivilegedAction;

/**
 * A security action to get and set the context class loader of the current thread.
 *
 * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a>
 */
public final class SetContextClassLoaderFromClassAction implements PrivilegedAction<ClassLoader> {
    private final Class<?> clazz;

    /**
     * Construct a new instance.
     *
     * @param clazz a class from the class loader to set
     */
    public SetContextClassLoaderFromClassAction(final Class<?> clazz) {
        this.clazz = clazz;
    }

    public ClassLoader run() {
        final Thread thread = Thread.currentThread();
        try {
            return thread.getContextClassLoader();
        } finally {
            thread.setContextClassLoader(clazz.getClassLoader());
        }
    }
}