/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * Copyright 1999-2004 The Apache Software Foundation.

 *

 * Licensed 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: FuncGenerateId.java,v 1.2.4.1 2005/09/14 20:18:45 jeffsuttor Exp $

 */

package com.sun.org.apache.xpath.internal.functions;

import com.sun.org.apache.xml.internal.dtm.DTM;

import com.sun.org.apache.xpath.internal.XPathContext;

import com.sun.org.apache.xpath.internal.objects.XObject;

import com.sun.org.apache.xpath.internal.objects.XString;

/**

 * Execute the GenerateId() function.

 * @xsl.usage advanced

 */

public class FuncGenerateId extends FunctionDef1Arg

{

    static final long serialVersionUID = 973544842091724273L;

  /**

   * Execute the function.  The function must return

   * a valid object.

   * @param xctxt The current execution context.

   * @return A valid XObject.

   *

   * @throws javax.xml.transform.TransformerException

   */

  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException

  {

    int which = getArg0AsNode(xctxt);

    if (DTM.NULL != which)

    {

      // Note that this is a different value than in previous releases

      // of Xalan. It's sensitive to the exact encoding of the node

      // handle anyway, so fighting to maintain backward compatability

      // really didn't make sense; it may change again as we continue

      // to experiment with balancing document and node numbers within

      // that value.

      return new XString("N" + Integer.toHexString(which).toUpperCase());

    }

    else

      return XString.EMPTYSTRING;

  }

}