Java example source code file (FuncExtElementAvailable.java)

This example Java source code file (FuncExtElementAvailable.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

extensionsprovider, funcextelementavailable, functiononearg, string, xobject

The FuncExtElementAvailable.java Java example source code

/*
 * 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: FuncExtElementAvailable.java,v 1.2.4.1 2005/09/14 19:58:32 jeffsuttor Exp $
 */
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;
    }
  }
}