/*
    * 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.view.facelets.el;
  
  import java.io.Externalizable;
  import java.io.IOException;
  import java.io.ObjectInput;
  import java.io.ObjectOutput;
  import javax.el.ELContext;
  import javax.el.ELException;
  import javax.el.MethodExpression;
  import javax.el.MethodInfo;
  import javax.el.MethodNotFoundException;
  import javax.el.PropertyNotFoundException;
  
  /**
   *
   * @author Leonardo Uribe
   */
  public class MethodExpressionMethodExpression extends MethodExpression implements Externalizable
  {
      
      private static final Object[] EMPTY_PARAMS = new Object[0];
      
      private MethodExpression methodExpressionOneArg;
      private MethodExpression methodExpressionZeroArg;
  
      public MethodExpressionMethodExpression()
      {
      }
      
      public MethodExpressionMethodExpression(MethodExpression methodExpressionOneArg,
                                              MethodExpression methodExpressionZeroArg)
      {
          this.methodExpressionOneArg = methodExpressionOneArg;
          this.methodExpressionZeroArg = methodExpressionZeroArg;
      }
  
      @Override
      public MethodInfo getMethodInfo(ELContext context)
              throws NullPointerException, PropertyNotFoundException, MethodNotFoundException, ELException
      {
          try
          {
              // call to the one argument MethodExpression
              return methodExpressionOneArg.getMethodInfo(context);
          }
          catch (MethodNotFoundException mnfe)
          {
              // call to the zero argument MethodExpression
              return methodExpressionZeroArg.getMethodInfo(context);
          }
      }
  
      @Override
      public Object invoke(ELContext context, Object[] params)
              throws NullPointerException, PropertyNotFoundException, MethodNotFoundException, ELException
      {
          try
          {
              // call to the one argument MethodExpression
              return methodExpressionOneArg.invoke(context, params);
          }
          catch (MethodNotFoundException mnfe)
          {
              // call to the zero argument MethodExpression
              return methodExpressionZeroArg.invoke(context, EMPTY_PARAMS);
          }
      }
  
      @Override
      public String getExpressionString()
      {
          try
          {
              // call to the one argument MethodExpression
              return methodExpressionOneArg.getExpressionString();
          }
          catch (MethodNotFoundException mnfe)
          {
              // call to the zero argument MethodExpression
              return methodExpressionZeroArg.getExpressionString();
          }
     }
 
     @Override
     public boolean isLiteralText()
     {
         return false;
     }
 
     public void writeExternal(ObjectOutput out) throws IOException
     {
         out.writeObject(methodExpressionOneArg);
         out.writeObject(methodExpressionZeroArg);
     }
 
     public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
     {
         methodExpressionOneArg = (MethodExpression) in.readObject();
         methodExpressionZeroArg = (MethodExpression) in.readObject();
     }
 
     @Override
     public boolean equals(Object obj)
     {
         if (obj instanceof MethodExpressionMethodExpression)
         {
             MethodExpressionMethodExpression me = (MethodExpressionMethodExpression) obj;
             return methodExpressionOneArg.equals(me.methodExpressionOneArg) &&
                    methodExpressionZeroArg.equals(me.methodExpressionZeroArg);
         }
         return false;
     }
 
     @Override
     public int hashCode()
     {
         int hash = 31;
         hash = 19 * hash + (this.methodExpressionOneArg != null ? this.methodExpressionOneArg.hashCode() : 0);
         hash = 19 * hash + (this.methodExpressionZeroArg != null ? this.methodExpressionZeroArg.hashCode() : 0);
         return hash;
     }
 }