001    // Copyright 2008, 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    /**
018     * Constants for persistent field strategies.
019     * 
020     * @see org.apache.tapestry5.annotations.Persist#value()
021     */
022    public class PersistenceConstants
023    {
024        /**
025         * The field's value is stored in the {@link org.apache.tapestry5.services.Session}.
026         */
027        public static final String SESSION = "session";
028    
029        /**
030         * The field's value is stored on the client, as a query parameter or hidden form field.
031         */
032        public static final String CLIENT = "client";
033    
034        /**
035         * A that stores data in the session, but only until the next request. This is often
036         * used for confirmation messages presented to the user.
037         */
038        public static final String FLASH = "flash";
039    }