/*

  * 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.commons.el;

 import java.util.List;

 import java.util.ArrayList;

 import javax.servlet.jsp.el.ELException;

 import javax.servlet.jsp.el.FunctionMapper;

 import javax.servlet.jsp.el.VariableResolver;

 /**

  *

  * <p>Represents a dynamic value, which consists of a prefix and an

  * optional set of ValueSuffix elements.  A prefix is something like

  * an identifier, and a suffix is something like a "property of" or

  * "indexed element of" operator.

  * 

  * @author Nathan Abramson - Art Technology Group

  * @author Shawn Bayern

  * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: bayard $

  **/

 public class ComplexValue

   extends Expression

 {

   //-------------------------------------

   // Properties

   //-------------------------------------

   // property prefix

   Expression mPrefix;

   public Expression getPrefix ()

   { return mPrefix; }

   public void setPrefix (Expression pPrefix)

   { mPrefix = pPrefix; }

   //-------------------------------------

   // property suffixes

   List mSuffixes;

   public List getSuffixes ()

   { return mSuffixes; }

   public void setSuffixes (List pSuffixes)

   { mSuffixes = pSuffixes; }

   //-------------------------------------

   /**

    *

    * Constructor

    **/

   public ComplexValue (Expression pPrefix,

                        List pSuffixes)

   {

     mPrefix = pPrefix;

     mSuffixes = pSuffixes;

   }

   //-------------------------------------

   // Expression methods

   //-------------------------------------

   /**

    *

    * Returns the expression in the expression language syntax

    **/

   public String getExpressionString ()

   {

     StringBuffer buf = new StringBuffer ();

     buf.append (mPrefix.getExpressionString ());

     for (int i = 0; mSuffixes != null && i < mSuffixes.size (); i++) {

       ValueSuffix suffix = (ValueSuffix) mSuffixes.get (i);

       buf.append (suffix.getExpressionString ());

     }

     return buf.toString ();

   }

   //-------------------------------------

   /**

    *

    * Evaluates by evaluating the prefix, then applying the suffixes

    **/

   public Object evaluate (VariableResolver pResolver,

                           FunctionMapper functions)

     throws ELException

   {

     Object ret = mPrefix.evaluate (pResolver, functions);

     // Apply the suffixes

     for (int i = 0; mSuffixes != null && i < mSuffixes.size (); i++) {

       ValueSuffix suffix = (ValueSuffix) mSuffixes.get (i);

       ret = suffix.evaluate (ret, pResolver, functions);

     }

     return ret;

   }

   public Expression bindFunctions(final FunctionMapper functions) throws ELException {

       final List suffixes = new ArrayList(mSuffixes.size());

       for (int i = 0; mSuffixes != null && i < mSuffixes.size (); i++) {

           ValueSuffix suffix = (ValueSuffix) mSuffixes.get (i);

           suffixes.add(suffix.bindFunctions(functions));

       }

       return new ComplexValue(mPrefix.bindFunctions(functions), suffixes);

   }

   //-------------------------------------

 }