/**
 * $Id$
 * $Date$
 *
 */

package org.xmlsh.sh.shell;

import java.util.Properties;

/**
 * This class replaces the System properties
 * to intercept calls to getProperty("user.dir") which is a thread local
 * variable
 * 
 * @author David A. Lee
 */
@SuppressWarnings("serial")
class SystemProperties extends Properties {

  public SystemProperties() {
    super();
    // TODO Auto-generated constructor stub
  }

  public SystemProperties(Properties defaults) {
    super(defaults);
    // TODO Auto-generated constructor stub
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.util.Properties#getProperty(java.lang.String, java.lang.String)
   */
  @Override
  public String getProperty(String key, String defaultValue) {

    if(key.equals("user.dir")) {
      String value = SystemEnvironment.getInstance().getProperty(key);
      if(value != null)
        return value;

    }
    // cant use super.getProperty(key,def) as it recurses !
    String value = super.getProperty(key);
    if(value == null)
      value = defaultValue;
    return value;
  }

  /*
   * (non-Javadoc)
   * 
   * @see java.util.Properties#getProperty(java.lang.String)
   */
  @Override
  public String getProperty(String key) {

    if(key.equals("user.dir"))
      return getProperty(key, null);

    return super.getProperty(key);
  }

}

//
//
// Copyright (C) 2008-2014 David A. Lee.
//
// The contents of this file are subject to the "Simplified BSD License" (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.opensource.org/licenses/bsd-license.php
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations
// under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is David A. Lee
//
// Portions created by (your name) are Copyright (C) (your legal entity). All
// Rights Reserved.
//
// Contributor(s): none.
//