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Public API for the Apache MyFaces Trinidad project
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/*
 * 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 org.apache.myfaces.trinidad.util;

import javax.el.ValueExpression;

import java.io.IOException;

import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.faces.el.ValueBinding;

/**
 * Extension to FacesMessage which keeps track of the label on the component
 * that generated the message.  This implementation supports a label that is either
 * a valueBinding or a String.  If a valueBinding is provided, then the ability to
 * serialize this FacesMessage may be suspect.  We should not change this for historical
 * reasons.
 * 
 * If serialization is a must, and the ValueBindings need to be serialized BEFORE
 * they are exchanged, then a version of the LabeledFacesMessage must be obtained
 * using the {@link #getLabeledFacesMessageWithLabelString} method.
 * 
 * @version $Name:  $ ($Revision: adfrt/faces/adf-faces-api/src/main/java/oracle/adf/view/faces/util/LabeledFacesMessage.java#0 $) $Date: 10-nov-2005.19:08:38 $
 */
public class LabeledFacesMessage extends FacesMessage
{
  public LabeledFacesMessage()
  {
  }

  /**
   * Creates a LabeledFacesMessage without a pre-set label.
   * @param severity the severity of the message
   * @param summary the message summary
   * @param detail the message detail
   */
  public LabeledFacesMessage(
    FacesMessage.Severity severity,
    String summary,
    String detail)
  {
    super(severity, summary, detail);
  }


  /**
   * Creates a LabeledFacesMessage with a label.
   * @param severity the severity of the message
   * @param summary the message summary
   * @param detail the message detail
   * @param label the message label - either a String or a ValueBinding
   */
  public LabeledFacesMessage(
    FacesMessage.Severity severity,
    String summary,
    String detail,
    Object label)
  {
    super(severity, summary, detail);
    _label = label;
  }

  /**
   * Returns the label, which can be either a String or a ValueBinding.
   */
  public Object getLabel()
  {
    return _label;
  }

  /**
   * Sets the label, which can be either a String or a ValueBinding.
   */
  public void setLabel(Object label)
  {
    _label = label;
  }

  /**
   * Gets a string representation of the label.  If the label
   * is a ValueBinding, the expression is evaluated and the string
   * value returned.
   */
  public String getLabelAsString(FacesContext context)
  {
    Object label = getLabel();

    if (label instanceof ValueExpression)
    {
      label = ((ValueExpression) label).getValue(context.getELContext());          
    }
    else if (label instanceof ValueBinding)
    {
      label = ((ValueBinding) label).getValue(context);
    }

    if (label == null)
      return null;

    return label.toString();
  }

  /**
   * Returns a LabeledFacesMessage object that is guarenteed to have a String as
   * the label.  If the label is already a String, this object will be returned.
   * If it is not then a new LabeledFacesMessage will be created.
   * 
   * By default the new LabeledFacesMessage will be created by calling
   * 
   * @param context
   * @return
   */
  public LabeledFacesMessage getLabeledFacesMessageWithLabelString(FacesContext context)
  {
    Object label = getLabel();

    if(null == label || label instanceof String)
    {
      return this;
    }
    
    return new LabeledFacesMessage(getSeverity(), getSummary(), getDetail(), getLabelAsString(context));
  }
  
  private Object _label;
  
  @SuppressWarnings("compatibility:-4615739861775811173")
  private static final long serialVersionUID = 1L;
}