package greenfoot.core;

import bluej.utility.Debug;

import java.util.HashMap;
import java.util.Map;




| A class which resides on the debug VM.  Its job is to hold copies of the project
| properties, mirrored across from the server VM.  It implements ReadOnlyProjectProperties
| because it is passed to other classes as if it is read-only, with changes only being
| possible via the propertyChangedOnServerVM method in this class; no debug VM code
| other than this can change a property.
|
public class ShadowProjectProperties
implements ReadOnlyProjectProperties{    
   private final Map<String, String> properties = new HashMap<>();

   
   


| Called when a property has changed on the server VM, and the change needs
| to be inserted into our shadow copy of the properties
|
public void propertyChangedOnServerVM(String key, String value)
   {
      if (value == null)
       {
         properties.remove(key);         
         }
       

      else
       {
         properties.put(key, value);         
         }     
      }
    
   
   @Override
   
   public String getString(String key, String defaultValue)
   {
      return properties.getOrDefault(key, defaultValue);     
      } 
   }