code: /*
   * 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.
   */
  /*
   * $Id$
   */
  package org.apache.xpath.operations;
  
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XNumber;
  import org.apache.xpath.objects.XObject;
  
  /**
   * The 'number()' operation expression executer.
   */
  public class Number extends UnaryOperation
  {
      static final long serialVersionUID = 7196954482871619765L;
  
    /**
     * Apply the operation to two operands, and return the result.
     *
     *
     * @param right non-null reference to the evaluated right operand.
     *
     * @return non-null reference to the XObject that represents the result of the operation.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public XObject operate(XObject right) throws javax.xml.transform.TransformerException
    {
  
      if (XObject.CLASS_NUMBER == right.getType())
        return right;
      else
        return new XNumber(right.num());
    }
    
    /**
     * Evaluate this operation directly to a double.
     *
     * @param xctxt The runtime execution context.
     *
     * @return The result of the operation as a double.
     *
     * @throws javax.xml.transform.TransformerException
     */
    public double num(XPathContext xctxt)
            throws javax.xml.transform.TransformerException
    {
  
      return m_right.num(xctxt);
    }
  
  }
  