package ca.uhn.hl7v2.hoh.api;
   
   import java.util.Collections;
   import java.util.HashSet;
   import java.util.Set;
   
   /**
    * Enum containing keys for message metadata
    */
  public enum MessageMetadataKeys {
  
  	
  	
  	/**
  	 * The host address from which the message was sent. Value
  	 * will be a {@link String} containing a raw IP address.
  	 * 
  	 *  @see javax.servlet.http.HttpServletRequest#getRemoteAddr()
  	 */
  	REMOTE_HOST_ADDRESS(String.class),
  	;
  	
  	
  	private static final Set<String> ourStringKeySetImm;
  	
  	static {
  		HashSet<String> stringKeySet = new HashSet<>();
  		ourStringKeySetImm = Collections.unmodifiableSet(stringKeySet);
  		for (MessageMetadataKeys next : values()) {
  			stringKeySet.add(next.name());
  		}
  	}
  	
  	private final Class<?> myValueType;
  
  	MessageMetadataKeys(Class<?> theValueType) {
  		myValueType = theValueType;
  	}
  
  	/**
  	 * @return The type for the value which is associated with this key
  	 */
  	public Class<?> getValueType() {
  		return myValueType;
  	}
  
  	/**
  	 * @return Returns a set containing the string equivalent to all
  	 * entries in the map
  	 */
  	public static Set<String> keyStringSet() {
  		return ourStringKeySetImm;
  	}
  	
  }