MessagesAdapter.java

/*
 * JBoss, Home of Professional Open Source
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.seam.faces.status;

import java.io.Serializable;
import java.util.Set;

import javax.enterprise.event.Observes;
import javax.faces.application.FacesMessage;
import javax.faces.application.FacesMessage.Severity;
import javax.faces.event.PhaseEvent;
import javax.inject.Inject;

import org.jboss.seam.faces.context.RenderContext;
import org.jboss.seam.faces.event.PreNavigateEvent;
import org.jboss.seam.faces.event.qualifier.Before;
import org.jboss.seam.faces.event.qualifier.RenderResponse;
import org.jboss.seam.international.status.Level;
import org.jboss.seam.international.status.Message;
import org.jboss.seam.international.status.Messages;
import org.jboss.solder.logging.Logger;

/**
 * Convert Seam Messages into FacesMessages before RenderResponse phase.<br>
 * <p/>
 * <p>
 * TODO perform EL evaluation
 * </p>
 * <p/>
 * <p>
 * NOTE This class is using method parameter injection of Messages rather than field injection to work around GLASSFISH-15721.
 * This shouldn't be necessary starting with Weld 1.1.1.
 * </p>
 *
 * @author <a href="mailto:lincolnbaxter@gmail.com">Lincoln Baxter, III</a>
 * @author <a href="http://community.jboss.org/people/dan.j.allen">Dan Allen</a>
 */
public class MessagesAdapter implements Serializable {
    private static final long serialVersionUID = -2908193057765795662L;
    private transient final Logger log = Logger.getLogger(MessagesAdapter.class);

    private static final String FLASH_MESSAGES_KEY = MessagesAdapter.class.getName() + ".FLASH_KEY";

    @Inject
    RenderContext context;

    void flushBeforeNavigate(@Observes final PreNavigateEvent event, Messages messages) {
        if (!messages.getAll().isEmpty()) {
            log.debug("Saving status Messages to Flash Scope");
            context.put(FLASH_MESSAGES_KEY, messages.getAll());
            messages.clear();
        }
    }

    @SuppressWarnings("unchecked")
    void convert(@Observes @Before @RenderResponse final PhaseEvent event, Messages messages) {
        Set<Message> savedMessages = (Set<Message>) context.get(FLASH_MESSAGES_KEY);
        if (savedMessages != null) {
            for (Message m : savedMessages) {
                event.getFacesContext().addMessage(m.getTargets(),
                        new FacesMessage(getSeverity(m.getLevel()), m.getText(), null));
            }
        }

        for (Message m : messages.getAll()) {
            event.getFacesContext().addMessage(m.getTargets(), new FacesMessage(getSeverity(m.getLevel()), m.getText(), null));
        }
        messages.clear();
    }

    private Severity getSeverity(final Level level) {
        Severity result = FacesMessage.SEVERITY_INFO;
        switch (level) {
            case INFO:
                break;
            case WARN:
                result = FacesMessage.SEVERITY_WARN;
                break;
            case ERROR:
                result = FacesMessage.SEVERITY_ERROR;
                break;
            case FATAL:
                result = FacesMessage.SEVERITY_FATAL;
                break;
            default:
                break;
        }
        return result;
    }

}