/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 javax.faces.application;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.*;

/**
 * Represents a message to be displayed to the JSF application user.
 * <p>
 * Instances of this type are registered via FacesContext.addMessage, and are kept only until
 * the end of the render phase. The standard h:message or h:messages components can render
 * these message objects.
 * <p>
 * See the javadoc for this class in the
 * <a href="http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/api/index.html">JSF Specification</a>
 * for more details.
 *
 * @author Manfred Geiler (latest modification by $Author$)
 * @version $Revision$ $Date$
 */
public class FacesMessage
        implements Serializable
{
    private static final long serialVersionUID = 4851488727794169661L;

    public static final String FACES_MESSAGES = "javax.faces.Messages";

    public static final FacesMessage.Severity SEVERITY_INFO = new Severity("Info", 1);
    public static final FacesMessage.Severity SEVERITY_WARN = new Severity("Warn", 2);
    public static final FacesMessage.Severity SEVERITY_ERROR = new Severity("Error", 3);
    public static final FacesMessage.Severity SEVERITY_FATAL = new Severity("Fatal", 4);
    public static final List VALUES;
    public static final Map VALUES_MAP;
    static
    {
        Map map = new HashMap(7);
        map.put(SEVERITY_INFO.toString(), SEVERITY_INFO);
        map.put(SEVERITY_WARN.toString(), SEVERITY_WARN);
        map.put(SEVERITY_ERROR.toString(), SEVERITY_ERROR);
        map.put(SEVERITY_FATAL.toString(), SEVERITY_FATAL);
        VALUES_MAP = Collections.unmodifiableMap(map);

        List severityList = new ArrayList(map.values());
        Collections.sort(severityList); // the JSF spec requires it to be sorted
        VALUES = Collections.unmodifiableList(severityList);
    }

    private transient FacesMessage.Severity _severity;  // transient, b/c FacesMessage.Severity is not Serializable
    private String _summary;
    private String _detail;

    public FacesMessage()
    {
        _severity = SEVERITY_INFO;
    }

    public FacesMessage(String summary)
    {
        _summary = summary;
        _severity = SEVERITY_INFO;
    }

    public FacesMessage(String summary, String detail)
    {
        _summary = summary;
        _detail = detail;
        _severity = SEVERITY_INFO;
    }

    public FacesMessage(FacesMessage.Severity severity,
                        String summary,
                        String detail)
    {
        if(severity == null) throw new NullPointerException("severity");
        _severity = severity;
        _summary = summary;
        _detail = detail;
    }

    public FacesMessage.Severity getSeverity()
    {
        return _severity;
    }

    public void setSeverity(FacesMessage.Severity severity)
    {
        if(severity == null) throw new NullPointerException("severity");
        _severity = severity;
    }

    public String getSummary()
    {
        return _summary;
    }

    public void setSummary(String summary)
    {
        _summary = summary;
    }

    public String getDetail()
    {
        if (_detail == null)
        {
            // Javadoc:
            // If no localized detail text has been defined for this message, return the localized summary text instead
            return _summary;
        }
        return _detail;
    }

    public void setDetail(String detail)
    {
        _detail = detail;
    }

    private void writeObject(ObjectOutputStream out) throws IOException
    {
        out.defaultWriteObject();  // write summary, detail
        out.writeInt(_severity._ordinal);  // FacesMessage.Severity is not Serializable, write ordinal only
    }

    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException
    {
        in.defaultReadObject();  // read summary, detail

        // FacesMessage.Severity is not Serializable, read ordinal and get related FacesMessage.Severity
        int severityOrdinal = in.readInt();
        _severity = (Severity) VALUES.get(severityOrdinal - 1);
    }


    public static class Severity
            implements Comparable
    {
        private String _name;
        private int _ordinal;

        private Severity(String name, int ordinal)
        {
            _name = name;
            _ordinal = ordinal;
        }

        public int getOrdinal()
        {
            return _ordinal;
        }

        public String toString()
        {
            return _name;
        }

        public int compareTo(Object o)
        {
            if (!(o instanceof Severity))
            {
                throw new IllegalArgumentException(o.getClass().getName());
            }
            return getOrdinal() - ((Severity)o).getOrdinal();
        }
    }

}