com.excilys.ebi.bank.web.messages.MessageHelper.java Source code

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Here is the source code for com.excilys.ebi.bank.web.messages.MessageHelper.java

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/**
 * Copyright 2011-2012 eBusiness Information, Groupe Excilys (www.excilys.com)
 *
 * 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.excilys.ebi.bank.web.messages;

import static com.google.common.collect.Lists.newArrayList;

import java.util.List;

import org.springframework.web.servlet.mvc.support.RedirectAttributes;

public class MessageHelper {

    public static final String MESSAGES_REDIRECT_ATTRIBUTE_NAME = "messages";

    private MessageHelper() {
        throw new UnsupportedOperationException();
    }

    public static void addFlashMessage(RedirectAttributes redirectAttributes, Message message) {

        @SuppressWarnings("unchecked")
        List<Message> messages = (List<Message>) redirectAttributes.getFlashAttributes()
                .get(MESSAGES_REDIRECT_ATTRIBUTE_NAME);
        if (messages == null) {
            redirectAttributes.addFlashAttribute(MESSAGES_REDIRECT_ATTRIBUTE_NAME, newArrayList(message));
        } else {
            messages.add(message);
        }
    }
}