001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.wicket.http2.markup.head;
018
019import javax.servlet.http.HttpServletRequest;
020
021import org.slf4j.Logger;
022import org.slf4j.LoggerFactory;
023
024/**
025 * The noop push builder is used to inform the dev to place in a vendor specific jar to support the
026 * push builder API
027 * 
028 * @author Martin Grigorov
029 *
030 */
031public class NoopPushBuilder implements PushBuilder
032{
033        private static final Logger LOG = LoggerFactory.getLogger(NoopPushBuilder.class);
034
035        /**
036         * An instance of the push builder
037         */
038        public static final NoopPushBuilder INSTANCE = new NoopPushBuilder();
039
040        /**
041         * Creates the noop push builder
042         */
043        private NoopPushBuilder()
044        {
045                // NOOP
046        }
047
048        /**
049         * Warns the dev to provide a vendor specific push builder API.
050         * <p>
051         * {@inheritDoc}
052         * </p>
053         */
054        @Override
055        public void push(HttpServletRequest httpServletRequest, PushItem... pushItems)
056        {
057                LOG.warn(
058                        "This PushBuilder does nothing. Please use one of the other implementations - Jetty9 or Tomcat8.5+");
059        }
060}