/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * ====================================================================
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 */ 

package org.apache.commons.el;

import java.util.List;
import javax.servlet.jsp.el.ELException;
import javax.servlet.jsp.el.VariableResolver;
import javax.servlet.jsp.el.FunctionMapper;

/**
 *
 * <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: luehe $
 **/

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,
			  Logger pLogger)
    throws ELException
  {
    Object ret = mPrefix.evaluate (pResolver, functions, pLogger);

    // 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, pLogger);
    }

    return ret;
  }

  //-------------------------------------
}