/*

 * 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.xalan.internal.templates.Constants;

// J2SE does not support Xalan interpretive

/*

import com.sun.org.apache.xalan.internal.transformer.TransformerImpl;

*/

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

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

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

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

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

/**

 * Execute the ExtElementAvailable() function.

 * @xsl.usage advanced

 */

public class FuncExtElementAvailable extends FunctionOneArg

{

    static final long serialVersionUID = -472533699257968546L;

  /**

   * 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

  {

    String prefix;

    String namespace;

    String methName;

    String fullName = m_arg0.execute(xctxt).str();

    int indexOfNSSep = fullName.indexOf(':');

    if (indexOfNSSep < 0)

    {

      prefix = "";

      namespace = Constants.S_XSLNAMESPACEURL;

      methName = fullName;

    }

    else

    {

      prefix = fullName.substring(0, indexOfNSSep);

      namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix);

      if (null == namespace)

        return XBoolean.S_FALSE;

      methName= fullName.substring(indexOfNSSep + 1);

    }

    if (namespace.equals(Constants.S_XSLNAMESPACEURL)

    ||  namespace.equals(Constants.S_BUILTIN_EXTENSIONS_URL)) {

        // J2SE does not support Xalan interpretive

        /*

      try {

        TransformerImpl transformer = (TransformerImpl) xctxt.getOwnerObject();

        return transformer.getStylesheet().getAvailableElements().containsKey(

                                                            new QName(namespace, methName))

               ? XBoolean.S_TRUE : XBoolean.S_FALSE;

      } catch (Exception e) {

        return XBoolean.S_FALSE;

      }

      */

        return XBoolean.S_FALSE;

    } else {

      //dml

      ExtensionsProvider extProvider = (ExtensionsProvider)xctxt.getOwnerObject();

      return extProvider.elementAvailable(namespace, methName)

             ? XBoolean.S_TRUE : XBoolean.S_FALSE;

    }

  }

}