    001    // Copyright 2009 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.corelib;
    016
    017    /**
    018     * Identifies how a {@link org.apache.tapestry5.corelib.LoopFormState} component stores state into the {@link
    019     * org.apache.tapestry5.services.FormSupport} object.
    020     *
    021     * @since 5.1.0.4
    022     */
    023    public enum LoopFormState
    024    {
    025        /**
    026         * No state of any kind is stored, as if the Loop was not contained within a {@link
    027         * org.apache.tapestry5.corelib.components.Form}.
    028         */
    029        NONE,
    030
    031        /**
    032         * Only enough state to iterate over the source values is stored. When the Form is submitted, the Loop will
    033         * re-acquire its source and iterate over it. This is equivalent to "volatile" mode in Tapestry 5.0. This can be
    034         * subject to race conditions when the values within the source change between render and submit.
    035         */
    036        ITERATION,
    037
    038        /**
    039         * Stores a sequence of values (obtained via a {@link org.apache.tapestry5.ValueEncoder}) into the Form state. The
    040         * source parameter is <em>not</em> re-acquired when the Form is submitted.
    041         */
    042        VALUES
    043    }