code: /*
   * 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.
   */
  /*
   * $Id$
   */
  package org.apache.xpath.functions;
  
  import java.io.BufferedInputStream;
  import java.io.InputStream;
  import java.util.Properties;
  
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XObject;
  import org.apache.xpath.objects.XString;
  import org.apache.xpath.res.XPATHErrorResources;
  
  /**
   * Execute the SystemProperty() function.
   * @xsl.usage advanced
   */
  public class FuncSystemProperty extends FunctionOneArg
  {
      static final long serialVersionUID = 3694874980992204867L;
    /**
     * The path/filename of the property file: XSLTInfo.properties
     * Maintenance note: see also
     * org.apache.xalan.processor.TransformerFactoryImpl.XSLT_PROPERTIES
     */
    static final String XSLT_PROPERTIES = 
              "org/apache/xalan/res/XSLTInfo.properties";
  
    /**
     * 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 fullName = m_arg0.execute(xctxt).str();
      int indexOfNSSep = fullName.indexOf(':');
      String result = null;
      String propName = "";
  
      // List of properties where the name of the
      // property argument is to be looked for.
      Properties xsltInfo = new Properties();
  
      loadPropertyFile(XSLT_PROPERTIES, xsltInfo);
  
      if (indexOfNSSep > 0)
      {
        String prefix = (indexOfNSSep >= 0)
                        ? fullName.substring(0, indexOfNSSep) : "";
        String namespace;
  
        namespace = xctxt.getNamespaceContext().getNamespaceForPrefix(prefix);
        propName = (indexOfNSSep < 0)
                   ? fullName : fullName.substring(indexOfNSSep + 1);
  
        if (namespace.startsWith("http://www.w3.org/XSL/Transform")
                || namespace.equals("http://www.w3.org/1999/XSL/Transform"))
        {
          result = xsltInfo.getProperty(propName);
  
          if (null == result)
          {
            warn(xctxt, XPATHErrorResources.WG_PROPERTY_NOT_SUPPORTED,
                 new Object[]{ fullName });  //"XSL Property not supported: "+fullName);
  
            return XString.EMPTYSTRING;
          }
        }
        else
        {
          warn(xctxt, XPATHErrorResources.WG_DONT_DO_ANYTHING_WITH_NS,
               new Object[]{ namespace,
                             fullName });  //"Don't currently do anything with namespace "+namespace+" in property: "+fullName);
  
          try
          {
              //if secure procession is enabled only handle required properties do not not map any valid system property
              if(!xctxt.isSecureProcessing())
              {
                  result = System.getProperty(propName);
              }
              else
              {
                  warn(xctxt, XPATHErrorResources.WG_SECURITY_EXCEPTION,
                          new Object[]{ fullName });  //"SecurityException when trying to access XSL system property: "+fullName);
              }
              if (null == result)
              {
                  return XString.EMPTYSTRING;
              }
          }
          catch (SecurityException se)
          {
            warn(xctxt, XPATHErrorResources.WG_SECURITY_EXCEPTION,
                 new Object[]{ fullName });  //"SecurityException when trying to access XSL system property: "+fullName);
  
            return XString.EMPTYSTRING;
          }
        }
      }
      else
      {
        try
        {
            //if secure procession is enabled only handle required properties do not not map any valid system property
            if(!xctxt.isSecureProcessing())
            {
                result = System.getProperty(fullName);
            }
            else
            {
                warn(xctxt, XPATHErrorResources.WG_SECURITY_EXCEPTION,
                        new Object[]{ fullName });  //"SecurityException when trying to access XSL system property: "+fullName);
            }
            if (null == result)
            {
                return XString.EMPTYSTRING;
            }
        }
        catch (SecurityException se)
        {
          warn(xctxt, XPATHErrorResources.WG_SECURITY_EXCEPTION,
               new Object[]{ fullName });  //"SecurityException when trying to access XSL system property: "+fullName);
  
          return XString.EMPTYSTRING;
        }
      }
  
      if (propName.equals("version") && result.length() > 0)
      {
        try
        {
          // Needs to return the version number of the spec we conform to.
          return new XString("1.0");
        }
        catch (Exception ex)
        {
          return new XString(result);
        }
      }
      else
        return new XString(result);
    }
  
    /**
     * Retrieve a propery bundle from a specified file
     * 
     * @param file The string name of the property file.  The name 
     * should already be fully qualified as path/filename
     * @param target The target property bag the file will be placed into.
     */
    public void loadPropertyFile(String file, Properties target)
    {
      try
      {
        // Use SecuritySupport class to provide privileged access to property file
        InputStream is = SecuritySupport.getResourceAsStream(ObjectFactory.findClassLoader(),
                                                file);
  
        // get a buffered version
        BufferedInputStream bis = new BufferedInputStream(is);
  
        target.load(bis);  // and load up the property bag from this
        bis.close();  // close out after reading
      }
      catch (Exception ex)
      {
        // ex.printStackTrace();
        throw new org.apache.xml.utils.WrappedRuntimeException(ex);
      }
    }
  }
  