/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2017 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.ws.transport.http.server;

import com.sun.istack.NotNull;
import com.sun.istack.Nullable;
import com.sun.xml.ws.resources.HttpserverMessages;
import com.sun.xml.ws.transport.http.HttpAdapter;
import com.sun.xml.ws.transport.http.WSHTTPConnection;

import javax.xml.ws.spi.http.HttpHandler;
import javax.xml.ws.spi.http.HttpExchange;
import java.io.IOException;
import java.util.concurrent.Executor;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * {@link HttpHandler} implementation that serves the actual request.
 *
 * @author Jitendra Kotamraju
 */
final class PortableHttpHandler extends HttpHandler {

    private static final String GET_METHOD = "GET";
    private static final String POST_METHOD = "POST";
    private static final String HEAD_METHOD = "HEAD";
    private static final String PUT_METHOD = "PUT";
    private static final String DELETE_METHOD = "DELETE";

    private static final Logger logger =
        Logger.getLogger(
            com.sun.xml.ws.util.Constants.LoggingDomain + ".server.http");

    private final HttpAdapter adapter;
    private final Executor executor;

    public PortableHttpHandler(@NotNull HttpAdapter adapter, @Nullable Executor executor) {
        assert adapter!=null;
        this.adapter = adapter;
        this.executor = executor;
    }

    /**
     * Called by HttpServer when there is a matching request for the context
     */
    @Override
    public void handle(HttpExchange msg) {
        try {
            if (logger.isLoggable(Level.FINE)) {
                logger.log(Level.FINE, "Received HTTP request:{0}", msg.getRequestURI());
            }
            if (executor != null) {
                // Use application's Executor to handle request. Application may
                // have set an executor using Endpoint.setExecutor().
                executor.execute(new HttpHandlerRunnable(msg));
            } else {
                handleExchange(msg);
            }
        } catch (Throwable e) {
            // Dont't propagate the exception otherwise it kills the httpserver
            logger.log(Level.SEVERE, null, e);
        }
    }

    public void handleExchange(HttpExchange msg) throws IOException {
        WSHTTPConnection con = new PortableConnectionImpl(adapter,msg);
        try {
            if (logger.isLoggable(Level.FINE)) {
                logger.log(Level.FINE, "Received HTTP request:{0}", msg.getRequestURI());
            }
            String method = msg.getRequestMethod();
            if(method.equals(GET_METHOD) || method.equals(POST_METHOD) || method.equals(HEAD_METHOD)
            || method.equals(PUT_METHOD) || method.equals(DELETE_METHOD)) {
                adapter.handle(con);
            } else {
                logger.warning(HttpserverMessages.UNEXPECTED_HTTP_METHOD(method));
            }
        } finally {
            msg.close();
        }
    }

    /**
     * Wrapping the processing of request in a Runnable so that it can be
     * executed in Executor.
     */
    class HttpHandlerRunnable implements Runnable {
        final HttpExchange msg;

        HttpHandlerRunnable(HttpExchange msg) {
            this.msg = msg;
        }

        @Override
        @SuppressWarnings("CallToThreadDumpStack")
        public void run() {
            try {
                handleExchange(msg);
            } catch (Throwable e) {
                // Does application's executor handle this exception ?
                e.printStackTrace();
            }
        }
    }

}
