/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/*

 * 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.

 */

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

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

import com.sun.org.apache.xml.internal.utils.XMLString;

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;

import org.xml.sax.ContentHandler;

/**

 * Execute the normalize-space() function.

 * @xsl.usage advanced

 */

public class FuncNormalizeSpace extends FunctionDef1Arg

{

    static final long serialVersionUID = -3377956872032190880L;

  /**

   * 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

  {

    XMLString s1 = getArg0AsString(xctxt);

    return (XString)s1.fixWhiteSpace(true, true, false);

  }

  /**

   * Execute an expression in the XPath runtime context, and return the

   * result of the expression.

   *

   *

   * @param xctxt The XPath runtime context.

   *

   * @return The result of the expression in the form of a <code>XObject</code>.

   *

   * @throws javax.xml.transform.TransformerException if a runtime exception

   *         occurs.

   */

  public void executeCharsToContentHandler(XPathContext xctxt,

                                              ContentHandler handler)

    throws javax.xml.transform.TransformerException,

           org.xml.sax.SAXException

  {

    if(Arg0IsNodesetExpr())

    {

      int node = getArg0AsNode(xctxt);

      if(DTM.NULL != node)

      {

        DTM dtm = xctxt.getDTM(node);

        dtm.dispatchCharactersEvents(node, handler, true);

      }

    }

    else

    {

      XObject obj = execute(xctxt);

      obj.dispatchCharactersEvents(handler);

    }

  }

}