/*
    * 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.el.convert;
  
  import javax.el.ELException;
  import javax.el.MethodExpression;
  import javax.faces.component.StateHolder;
  import javax.faces.context.FacesContext;
  import javax.faces.el.EvaluationException;
  import javax.faces.el.MethodBinding;
  import javax.faces.el.MethodNotFoundException;
  
  /**
   * Converts a MethodExpression to a MethodBinding. See JSF 1.2 spec section 5.8.4
   * 
   * ATTENTION: If you make changes to this class, treat javax.faces.component._MethodExpressionToMethodBinding
   * accordingly.
   * 
   * @author Stan Silvert
   * @see javax.faces.component._MethodExpressionToMethodBinding
   */
  public final class MethodExpressionToMethodBinding extends MethodBinding implements StateHolder
  {
  
      private MethodExpression methodExpression;
  
      private boolean isTransient = false;
  
      public MethodExpressionToMethodBinding()
      {
          methodExpression = null;
      }
  
      /** Creates a new instance of MethodExpressionToMethodBinding */
      public MethodExpressionToMethodBinding(final MethodExpression methodExpression)
      {
          this.methodExpression = methodExpression;
      }
  
      @Override
      public String getExpressionString()
      {
          return methodExpression.getExpressionString();
      }
  
      @Override
      public Class getType(FacesContext facesContext) throws MethodNotFoundException
      {
  
          try
          {
              return methodExpression.getMethodInfo(facesContext.getELContext()).getReturnType();
          }
          catch (javax.el.MethodNotFoundException e)
          {
              throw new javax.faces.el.MethodNotFoundException(e);
          }
      }
  
      @Override
      public Object invoke(final FacesContext facesContext, final Object[] params) throws EvaluationException,
                                                                                  MethodNotFoundException
      {
  
          try
          {
              return methodExpression.invoke(facesContext.getELContext(), params);
          }
          catch (javax.el.MethodNotFoundException e)
          {
              throw new javax.faces.el.MethodNotFoundException(e);
          }
          catch (ELException e)
          {
              throw new EvaluationException(e.getCause());
          }
      }
  
      // -------- StateHolder methods -------------------------------------------
  
      public void restoreState(final FacesContext context, final Object state)
      {
          methodExpression = (MethodExpression) state;
     }
 
     public Object saveState(final FacesContext context)
     {
         return methodExpression;
     }
 
     public void setTransient(final boolean newTransientValue)
     {
         isTransient = newTransientValue;
     }
 
     public boolean isTransient()
     {
         return isTransient;
     }
 
 }