/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2011, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.core.joran.conditional;
  
  import ch.qos.logback.core.spi.PropertyContainer;
  import ch.qos.logback.core.util.OptionHelper;
  
  public class PropertyWrapperForScripts {
  
    PropertyContainer local;
    PropertyContainer context;
  
    // this method is invoked by reflection in PropertyEvalScriptBuilder
    public void setPropertyContainers(PropertyContainer local, PropertyContainer context) {
      this.local = local;
      this.context = context;
    }
  
    public boolean isNull(String k) {
      String val = OptionHelper.propertyLookup(k, local, context);
      return (val == null);
    }
  
    public boolean isDefined(String k) {
      String val = OptionHelper.propertyLookup(k, local, context);
      return (val != null);
    }
  
    public String p(String k) {
      return property(k);
    }
    
    public String property(String k) {
      String val = OptionHelper.propertyLookup(k, local, context);
      if(val != null)
        return val;
      else
        return "";
    }
  }