/*

  * 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;

     }

 }