SystemMessagesProvider.java example

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/*
 * Copyright 2000-2016 Vaadin Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.vaadin.server;

import java.io.Serializable;

import com.vaadin.ui.UI;

/**
 * Gives out system messages based on Locale. Registered using
 * {@link VaadinService#setSystemMessagesProvider(SystemMessagesProvider)}.
 *
 * @author Vaadin Ltd
 * @since 7.0.0
 */
@FunctionalInterface
public interface SystemMessagesProvider extends Serializable {
    /**
     * Gets the system messages to use in the given context. The
     * {@link SystemMessagesInfo} object contains available information but in
     * most cases some or both of {@link VaadinSession#getCurrent()} and
     * {@link UI#getCurrent()} can also be used to find more information to help
     * the decision.
     *
     * @param systemMessagesInfo
     *            Locale, current request and other information available.
     * @return a system messages object
     */
    public SystemMessages getSystemMessages(
            SystemMessagesInfo systemMessagesInfo);
}