org.apache.xpath.functions.FuncLang Maven / Gradle / Ivy

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Tool to convert CSV and XLS to XML, to transform XML and to convert XML to CSV, HTML, other text files, PDF etc., useful as command line tool and integrated in other projects.

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/*
 * 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: FuncLang.java 468655 2006-10-28 07:12:06Z minchau $
 */
package org.apache.xpath.functions;

import org.apache.xml.dtm.DTM;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XBoolean;
import org.apache.xpath.objects.XObject;

/**
 * Execute the Lang() function.
 * @xsl.usage advanced
 */
public class FuncLang extends FunctionOneArg
{
    static final long serialVersionUID = -7868705139354872185L;

  /**
   * 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 lang = m_arg0.execute(xctxt).str();
    int parent = xctxt.getCurrentNode();
    boolean isLang = false;
    DTM dtm = xctxt.getDTM(parent);

    while (DTM.NULL != parent)
    {
      if (DTM.ELEMENT_NODE == dtm.getNodeType(parent))
      {
        int langAttr = dtm.getAttributeNode(parent, "http://www.w3.org/XML/1998/namespace", "lang");

        if (DTM.NULL != langAttr)
        {
          String langVal = dtm.getNodeValue(langAttr);
          // %OPT%
          if (langVal.toLowerCase().startsWith(lang.toLowerCase()))
          {
            int valLen = lang.length();

            if ((langVal.length() == valLen)
                    || (langVal.charAt(valLen) == '-'))
            {
              isLang = true;
            }
          }

          break;
        }
      }

      parent = dtm.getParent(parent);
    }

    return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE;
  }
}