/*
    * 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.commons.util;
  
  import java.text.MessageFormat;
  import java.util.Locale;
  
  import javax.el.ValueExpression;
  import javax.faces.application.FacesMessage;
  import javax.faces.context.FacesContext;
  import javax.faces.el.ValueBinding;
  
  /** 
   * This class encapsulates a FacesMessage to evaluate the label
   * expression on render response, where f:loadBundle is available
   * 
   * @author Leonardo Uribe (latest modification by $Author: skitching $)
   * @version $Revision: 676298 $ $Date: 2008-07-13 05:31:48 -0500 (Dom, 13 Jul 2008) $
   */
  public class ParametrizableFacesMessage extends FacesMessage
  {
      /**
       * 
       */
      private static final long serialVersionUID = 7792947730961657948L;
  
      private final Object _args[];
      private String _evaluatedDetail;
      private String _evaluatedSummary;
      private transient Object _evaluatedArgs[];
      private Locale _locale;
  
      public ParametrizableFacesMessage(
              String summary, String detail, Object[] args, Locale locale)
      {
          super(summary, detail);
          if(locale == null) throw new NullPointerException("locale");
          _locale = locale;
          _args = args;
      }
  
      public ParametrizableFacesMessage(FacesMessage.Severity severity,
              String summary, String detail, Object[] args, Locale locale)
      {
          super(severity, summary, detail);
          if(locale == null) throw new NullPointerException("locale");
          _locale = locale;
          _args = args;
      }
  
      @Override
      public String getDetail()
      {
          if (_evaluatedArgs == null && _args != null)
          {
              evaluateArgs();
          }
          if (_evaluatedDetail == null)
          {
              MessageFormat format = new MessageFormat(super.getDetail(), _locale);
              _evaluatedDetail = format.format(_evaluatedArgs);
          }
          return _evaluatedDetail;
      }
  
      @Override
      public void setDetail(String detail)
      {
          super.setDetail(detail);
          _evaluatedDetail = null;
      }
      
      public String getUnformattedDetail()
      {
          return super.getDetail();
      }
  
      @Override
      public String getSummary()
      {
          if (_evaluatedArgs == null && _args != null)
          {
              evaluateArgs();
         }
         if (_evaluatedSummary == null)
         {
             MessageFormat format = new MessageFormat(super.getSummary(), _locale);
             _evaluatedSummary = format.format(_evaluatedArgs);
         }
         return _evaluatedSummary;
     }
 
     @Override
     public void setSummary(String summary)
     {
         super.setSummary(summary);
         _evaluatedSummary = null;
     }
     
     public String getUnformattedSummary()
     {
         return super.getSummary();
     }
 
     private void evaluateArgs()
     {
         _evaluatedArgs = new Object[_args.length];
         FacesContext facesContext = null;
         for (int i = 0; i < _args.length; i++)
         {
             if (_args[i] == null)
             {
                 continue;
             }
             else if (_args[i] instanceof ValueBinding)
             {
                 if (facesContext == null)
                 {
                     facesContext = FacesContext.getCurrentInstance();
                 }
                 _evaluatedArgs[i] = ((ValueBinding)_args[i]).getValue(facesContext);
             }
             else if (_args[i] instanceof ValueExpression)
             {
                 if (facesContext == null)
                 {
                     facesContext = FacesContext.getCurrentInstance();
                 }
                 _evaluatedArgs[i] = ((ValueExpression)_args[i]).getValue(facesContext.getELContext());
             }
             else 
             {
                 _evaluatedArgs[i] = _args[i];
             }
         }
     }
 }