src/org/apache/xpath/operations/GenericOpFunc.java

/*
 * The Apache Software License, Version 1.1
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 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
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 *       "This product includes software developed by the
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
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package org.apache.xpath.operations;

import javax.xml.transform.TransformerException;

import org.apache.xml.utils.WrappedRuntimeException;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XObject;

/**
 * The responsibility of enclosing_type is to .
 * 
 * Created Jul 29, 2002
 * @author sboag
 */
public abstract class GenericOpFunc
{

  /**
   * Constructor for GenericOpFunc.
   */
  public GenericOpFunc()
  {
    super();
  }

  /**
   * Perform a generic operation on two operands.
   * @param xctxt  The dynamic execution context.
   * @param lhs The left hand side operation.
   * @param rhs The right hand side operation.
   * @return XObject The result object.
   */
  public abstract XObject operate(XPathContext xctxt, XObject lhs, XObject rhs)
          throws TransformerException;

  /**
   * Perform a generic operation on two operands, and return a boolean.
   * @param xctxt  The dynamic execution context.
   * @param lhs The left hand side operation.
   * @param rhs The right hand side operation.
   * @return boolean The result value.
   */
  public boolean operateToBoolean(XPathContext xctxt, XObject lhs, XObject rhs)
        throws TransformerException
  {
    try
    {
      XObject xobj = operate(xctxt, lhs, rhs);
      return xobj.bool(xctxt);
    }
    catch (TransformerException e)
    {
      throw new WrappedRuntimeException(e);
    }
  }
  
  

}