/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, 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 "";
      }
  }