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/*
 * 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. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 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
 *    from this software without prior written permission. For written 
 *    permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * .
 *
 */ 

package org.jbpm.jpdl.el.impl;

import java.util.List;

import org.jbpm.jpdl.el.ELException;
import org.jbpm.jpdl.el.FunctionMapper;
import org.jbpm.jpdl.el.VariableResolver;

/**
 *
 * An expression representing one or more unary operators on a
 * value
 * 
 * @author Nathan Abramson - Art Technology Group
 * @author Shawn Bayern
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author$
 **/

public class UnaryOperatorExpression
  extends Expression
{
  //-------------------------------------
  // Properties
  //-------------------------------------
  // property operator

  UnaryOperator mOperator;
  public UnaryOperator getOperator ()
  { return mOperator; }
  public void setOperator (UnaryOperator pOperator)
  { mOperator = pOperator; }

  //-------------------------------------
  // property operators

  List mOperators;
  public List getOperators ()
  { return mOperators; }
  public void setOperators (List pOperators)
  { mOperators = pOperators; }

  //-------------------------------------
  // property expression

  Expression mExpression;
  public Expression getExpression ()
  { return mExpression; }
  public void setExpression (Expression pExpression)
  { mExpression = pExpression; }

  //-------------------------------------
  /**
   *
   * Constructor
   **/
  public UnaryOperatorExpression (UnaryOperator pOperator,
				  List pOperators,
				  Expression pExpression)
  {
    mOperator = pOperator;
    mOperators = pOperators;
    mExpression = pExpression;
  }

  //-------------------------------------
  // Expression methods
  //-------------------------------------
  /**
   *
   * Returns the expression in the expression language syntax
   **/
  public String getExpressionString ()
  {
    StringBuffer buf = new StringBuffer ();
    buf.append ("(");
    if (mOperator != null) {
      buf.append (mOperator.getOperatorSymbol ());
      buf.append (" ");
    }
    else {
      for (int i = 0; i < mOperators.size (); i++) {
	UnaryOperator operator = (UnaryOperator) mOperators.get (i);
	buf.append (operator.getOperatorSymbol ());
	buf.append (" ");
      }
    }
    buf.append (mExpression.getExpressionString ());
    buf.append (")");
    return buf.toString ();
  }

  //-------------------------------------
  /**
   *
   * Evaluates to the literal value
   **/
  public Object evaluate (VariableResolver pResolver,
			  FunctionMapper functions,
			  Logger pLogger)
    throws ELException
  {
    Object value = mExpression.evaluate (pResolver, functions, pLogger);
    if (mOperator != null) {
      value = mOperator.apply (value, pLogger);
    }
    else {
      for (int i = mOperators.size () - 1; i >= 0; i--) {
	UnaryOperator operator = (UnaryOperator) mOperators.get (i);
	value = operator.apply (value, pLogger);
      }
    }
    return value;
  }

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