    001    // Copyright 2010 The Apache Software Foundation
    002    //
    003    // Licensed under the Apache License, Version 2.0 (the "License");
    004    // you may not use this file except in compliance with the License.
    005    // You may obtain a copy of the License at
    006    //
    007    // http://www.apache.org/licenses/LICENSE-2.0
    008    //
    009    // Unless required by applicable law or agreed to in writing, software
    010    // distributed under the License is distributed on an "AS IS" BASIS,
    011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012    // See the License for the specific language governing permissions and
    013    // limitations under the License.
    014
    015    package org.apache.tapestry5;
    016
    017    import org.apache.tapestry5.internal.structure.PageResetListener;
    018    import org.apache.tapestry5.runtime.PageLifecycleListener;
    019    import org.apache.tapestry5.services.ComponentEventLinkEncoder;
    020
    021    /**
    022     * Constants needed by end-user classes.
    023     *
    024     * @since 5.2.0
    025     */
    026    public class TapestryConstants
    027    {
    028
    029        /**
    030         * The extension used for Tapestry component template files, <em>T</em>apestry <em>M</em>arkup <em>L</em>anguage.
    031         * Template files are well-formed XML files.
    032         */
    033        public static final String TEMPLATE_EXTENSION = "tml";
    034
    035        /**
    036         * Name of query parameter that is placed on "loopback" links (page render links for the same
    037         * page). This mostly includes the redirects sent after a component event request. Page render
    038         * requests
    039         * that do <em>not</em> have the LOOPBACK query parameter will trigger a {@linkplain PageResetListener reset
    040         * notification} after the initialization event; the
    041         * LOOPBACK
    042         * prevents this reset notification.
    043         *
    044         * @since 5.2.0
    045         * @see ComponentEventLinkEncoder#createPageRenderLink(org.apache.tapestry5.services.PageRenderRequestParameters)
    046         * @see ComponentEventLinkEncoder#decodePageRenderRequest(org.apache.tapestry5.services.Request)
    047         * @see PageResetListener
    048         */
    049        public static final String PAGE_LOOPBACK_PARAMETER_NAME = "t:lb";
    050
    051    }