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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 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 io.undertow.servlet.core;

import io.undertow.server.HttpServerExchange;
import io.undertow.servlet.api.ThreadSetupAction;
import io.undertow.servlet.handlers.ServletRequestContext;

/**
 * @author Stuart Douglas
 */
class ServletRequestContextThreadSetupAction implements ThreadSetupAction {

    static final ServletRequestContextThreadSetupAction INSTANCE = new ServletRequestContextThreadSetupAction();

    private ServletRequestContextThreadSetupAction() {

    }

    @Override
    public Handle setup(HttpServerExchange exchange) {
        if(exchange == null) {
            return null;
        }
        ServletRequestContext servletRequestContext = exchange.getAttachment(ServletRequestContext.ATTACHMENT_KEY);
        final ServletRequestContext old = ServletRequestContext.current();
        SecurityActions.setCurrentRequestContext(servletRequestContext);
        return new Handle() {
            @Override
            public void tearDown() {
                ServletRequestContext.setCurrentRequestContext(old);
            }
        };
    }
}